1
|
Wang Z, Li Y, Sun M. The effect of weak π-π interactions on single-molecule electron transport properties of the tetraphenylethene molecule and its derivatives: a first-principles study. Phys Chem Chem Phys 2024; 26:1067-1076. [PMID: 38095244 DOI: 10.1039/d3cp04593e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2024]
Abstract
Intramolecular π-π interactions are a significant research focus in fields such as chemistry, biology, and materials science. Different configurations of benzene-benzene moieties within a molecule can affect the magnitude of their π-π interactions, consequently influencing the electronic transport capabilities of the molecule. In this study, we designed three π-conjugated molecules, TPEM, TPEEM, and TEEPM, based on tetraphenylethene (TPE). These three molecules exhibit three distinct π-conjugated structures: linear cis-π-conjugation, linear trans-π-conjugation, and cross-π-conjugation. Thereinto, TPEM and TPEEM molecules share the same TPE core, with identical π-π interaction distances, while the TEEPM molecule has acetylene groups between the TPE units, thereby increasing the π-π interaction distances between the benzene moieties. Using density functional theory calculations combined with non-equilibrium Green's function (DFT+NEGF), our results reveal that the conductance order of different π-conjugated structures in TPEM and TPEEM molecules is as follows: cis > cross ≈ trans. Through analysis of transmission spectra, transmission pathways, and the innermost π orbitals, we find that in TPEM and TPEEM molecules, the cis- and cross-π-conjugated structures exhibit π-π interactions between benzene moieties and provide special through-space electron transport pathways, enhancing their electronic transport capabilities in coordination with the bonded molecular framework, whereas their trans-conjugated structures only allow electron transport along the molecular backbone. In contrast, in TEEPM molecule, due to the absence of π-π interactions, the conductance of different π-conjugated structures is primarily determined by the molecular backbone and follows the order: trans > cis > cross. These findings provide a theoretical basis for designing single-molecule electronic devices with multiple electron channels based on intramolecular π-π interactions.
Collapse
Affiliation(s)
- Zhiye Wang
- Department of Materials and Metallurgy, Wuhan University of Science and Technology, 430081, Wuhan, China.
| | - Yunchuan Li
- Department of Materials and Metallurgy, Wuhan University of Science and Technology, 430081, Wuhan, China.
| | - Mingjun Sun
- Department of Materials and Metallurgy, Wuhan University of Science and Technology, 430081, Wuhan, China.
| |
Collapse
|
2
|
Fathizadeh S. Phonon-assisted nearly pure spin current in DNA molecular chains: a multifractal analysis. Sci Rep 2023; 13:21281. [PMID: 38042962 PMCID: PMC10693578 DOI: 10.1038/s41598-023-48644-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Accepted: 11/28/2023] [Indexed: 12/04/2023] Open
Abstract
Motivated by the development of molecular spintronics, we studied the phonon-assisted spin transport along a DNA chain in the presence of environmental-induced dephasing using multifractal analysis. The results demonstrate that a nearly pure spin current is generated in the presence of the voltage gate. The pure spin current is enhanced by increasing thermal effects. The vibration modes due to the thermal phonon bath assist in generating the spin current, so the spin state is more delocalized in strong electron-phonon coupling. The phonon chirality can translate to the electron spin to create a nontrivial spin texture, including spin currents. The spin states become more extended by increasing the phonon temperature. On the other hand, the spin states are less localized in longer chains as the spin selectivity is higher in longer chains than in short ones. Therefore, we can engineer a molecular spintronic device by controlling phonon effects on the storage and transport of binary digits.
Collapse
Affiliation(s)
- S Fathizadeh
- Department of Physics, Urmia University of Technology, Urmia, Iran.
- Research Institute for Applied Physics and Astronomy, Tabriz University, Tabriz, Iran.
| |
Collapse
|
3
|
Malek M, Danaie M. A single molecule diode based on gold electrodes and benzene molecule: conductivity and coupling analysis. J Mol Model 2023; 29:332. [PMID: 37806972 DOI: 10.1007/s00894-023-05740-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 09/28/2023] [Indexed: 10/10/2023]
Abstract
CONTEXT In this paper, we simulate a single-molecule diode to calculate the effective coupling and investigate the conductivity, as well as the effect of the electric field on these two parameters. First, we obtain the molecule states and energies at 0 V. The next step is to calculate the electrode/molecule coupling using the obtained electrode and molecule Hamiltonian. The electrode/molecule coupling depends on distance. By increasing the distance from 5 to 5.5 angstroms, the coupling decreases from 0.004 to 0.0002 eV. After calculating the electrode/molecule coupling, which is the most significant parameter in electron transfer, the results can be used to obtain the current-voltage and conductivity curves of the device. Simulation results demonstrate that externally applied electric field to the benzene molecule (isolated molecule) can cause a reduction in the effective coupling between the Au electrode and benzene, leading to decreased current and conductivity. Additionally, the applied electric field narrows the gap between the HOMO and LUMO energy levels. METHODS We conducted this computational work using Gaussian 09 software and a MATLAB code, both of which are based on the density functional theory (DFT) approach and the self-consistent field (SCF) method. For DFT calculations, we employed the three-parameter Beck hybrid exchange functional (B3), hybridized with the nonlocal correlation functional developed by Lee, Yang, and Parr (LYP). All optimizations were performed with triple-zeta polarized (TZP) split-valence 6-311G basis sets. The final step involved calculating the electrode/molecule coupling using the Huckel method and integrating the site-to-state transformation with Huckel parameters and the Fermi golden rule. After this calculation, we obtained the current-voltage and conductivity curves using MATLAB software.
Collapse
Affiliation(s)
- Majid Malek
- Faculty of Electrical and Computer Engineering, Semnan University, Semnan, Iran
| | - Mohammad Danaie
- Faculty of Electrical and Computer Engineering, Semnan University, Semnan, Iran.
| |
Collapse
|
4
|
Tada T. Quantum Chemical Studies on Possible Molecular Devices Based on Electric Field-Induced Intramolecular Charge Transfer. J Phys Chem A 2023; 127:7297-7308. [PMID: 37638599 DOI: 10.1021/acs.jpca.3c02195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/29/2023]
Abstract
We report quantum chemical studies on possible molecular devices working based on electric field-induced intramolecular charge transfer (EFIMCT). In the case of donor-acceptor (DA)-type molecular systems, intramolecular charge transfer (IMCT) can be induced by applying the external electric field to molecular systems along the charge transport direction, providing a possible switching mechanism which does not depend upon the electron-phonon coupling effect and is different from the negative differential resistance mechanism observed in the well-known NO2-substituted phenylene ethynylene oligomers. When the EFIMCT proceeds, the molecular systems have strong static electron correlation effects, where the standard nonequilibrium Green's function-density functional theory (DFT) approach cannot be applied to the molecular junction. As a first step toward practical switching devices, we do quantum chemical studies on the EFIMCT in such molecular systems as an isolated molecule, instead of using the electrode-junction-electrode open quantum system model. A prototype molecule P1 is designed as a tentative candidate molecule where the EFIMCT can proceed. The complete active space self-consistent field (CASSCF) molecular orbital calculations on P1 indicate that the EFIMCT can proceed at the external electric field intensity of 0.003 au, corresponding to about 2.25 V bias voltage. This calculated result strongly suggests that the development of this type of switching devices working at practically low bias voltage is feasible if the molecular system is properly designed. Broken symmetry unrestricted Hartree-Fock and spin-polarized Kohn-Sham DFT calculations also qualitatively reproduce the CASSCF results on P1, to some extent, indicating that these approaches can be employed for rough estimations on the EFIMCT such as the first screening of a large quantity of candidate molecules for this type of molecular devices. The possibility of molecular memory devices based on the EFIMCT is also discussed by analyzing the ground and excited potential energy surface model. Remaining challenges to develop practical molecular devices are discussed.
Collapse
Affiliation(s)
- Tsukasa Tada
- Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, Minami-Ohsawa 1-1, Hachioji, Tokyo 192-0397, Japan
| |
Collapse
|
5
|
Guo J, Lu M, Zhang X, Sun S, Han C, Zhang Y, Yang X, Kershaw SV, Zheng W, Rogach AL. Highly Stable and Efficient Light-Emitting Diodes Based on Orthorhombic γ-CsPbI 3 Nanocrystals. ACS NANO 2023; 17:9290-9301. [PMID: 37126487 DOI: 10.1021/acsnano.3c00789] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Orthorhombic γ-CsPbI3 possesses the highest structural stability among the optically active (light-emissive) CsPbI3 perovskites. Here, we make use of a seed-assisted heteroepitaxial growth to fabricate seed/core/shell CaIx/γ-CsPbI3/CaI2 nanocrystals. Ultrasmall CaIx nanoparticles serve as seeds to template the Pb-centered octahedral arrangement which enables the formation of the γ-CsPbI3 phase and at the same time inhibit lattice strain by blocking the force transfer that otherwise leads to an octahedral twist and so improve the structural stability of the resulting nanocrystals. An outer shell composed from the same material, CaI2, isolates the formed γ-CsPbI3 nanocrystals from the environment, which also significantly improves their stability under ambient conditions. Optical and electrical studies indicate that the seed/core/shell CaIx/γ-CsPbI3/CaI2 structure possesses a shallower set of trap states as compared to cubic α-CsPbI3 nanocrystals. Light-emitting diodes utilizing these γ-CsPbI3 nanocrystals show a record high external quantum efficiency of 25.3%, high brightness of over 13600 cd/m2, and an operational lifetime of ∼14 h before reaching 50% of their initial luminance. These devices can repeatedly be illuminated over 650 times at ∼500 cd/m2 with no decline of brightness, which indicates their great commercial potential.
Collapse
Affiliation(s)
- Jie Guo
- Key Laboratory of Automobile Materials MOE, School of Materials Science & Engineering, and Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials, Jilin University, Changchun 130012, People's Republic of China
| | - Min Lu
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, People's Republic of China
| | - Xiaoyu Zhang
- Key Laboratory of Automobile Materials MOE, School of Materials Science & Engineering, and Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials, Jilin University, Changchun 130012, People's Republic of China
| | - Siqi Sun
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, People's Republic of China
| | - Ce Han
- Key Laboratory of Automobile Materials MOE, School of Materials Science & Engineering, and Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials, Jilin University, Changchun 130012, People's Republic of China
| | - Yu Zhang
- State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, People's Republic of China
| | - Xuyong Yang
- Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, Shanghai 200072, People's Republic of China
| | - Stephen V Kershaw
- Department of Materials Science and Engineering and Centre for Functional Photonics (CFP), City University of Hong Kong, Hong Kong SAR 999077, People's Republic of China
| | - Weitao Zheng
- Key Laboratory of Automobile Materials MOE, School of Materials Science & Engineering, and Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials, Jilin University, Changchun 130012, People's Republic of China
| | - Andrey L Rogach
- Department of Materials Science and Engineering and Centre for Functional Photonics (CFP), City University of Hong Kong, Hong Kong SAR 999077, People's Republic of China
| |
Collapse
|
6
|
Mu Y, Yu J, Hu R, Wang CH, Cheng C, Hou BP. Ab initio study revealing remarkable oscillatory effects and negative differential resistance in the molecular device of silicon carbide chains. Phys Chem Chem Phys 2023; 25:13265-13274. [PMID: 36924456 DOI: 10.1039/d2cp05677a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
Inspired by the requirements of miniaturization and multifunction of molecular devices, we investigate the quantum transport properties of three unique molecular devices with silicon carbide chains bridging gold electrodes by an ab initio approach. The pronounced quantum effects, including the oscillation of charge, conductance, and current, together with the negative differential resistance (NDR), have been observed simultaneously over a wide region in the double-chain device. It changes the regular situation that these two effects usually emerge in single-chain systems at the same time. Inspections of the visible differences in the transport behaviors relevant to length and bias between the three devices further evidence that the interchain interaction and molecule-electrode coupling are decisive factors for achieving the quantum effects of oscillation and NDR. These two factors can improve electronic transport capability through enhancing transmission, strengthening the delocalization of frontier molecular orbitals, and reducing potential barriers. Our results not only lay a solid foundation for the application of silicon carbide chains in the miniaturized and multifunctional molecular devices with good performance, but also provide an efficient way to the continuing search for materials with multiple controllable quantum effects in nanoelectronics.
Collapse
Affiliation(s)
- Yi Mu
- College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu, China.
| | - Jie Yu
- College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu, China.
| | - Rui Hu
- College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu, China.
| | - Cui-Hong Wang
- College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu, China.
| | - Cai Cheng
- College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu, China.
| | - Bang-Pin Hou
- College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu, China.
| |
Collapse
|
7
|
Gupta R, Fereiro JA, Bayat A, Pritam A, Zharnikov M, Mondal PC. Nanoscale molecular rectifiers. Nat Rev Chem 2023; 7:106-122. [PMID: 37117915 DOI: 10.1038/s41570-022-00457-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/30/2022] [Indexed: 01/15/2023]
Abstract
The use of molecules bridged between two electrodes as a stable rectifier is an important goal in molecular electronics. Until recently, however, and despite extensive experimental and theoretical work, many aspects of our fundamental understanding and practical challenges have remained unresolved and prevented the realization of such devices. Recent advances in custom-designed molecular systems with rectification ratios exceeding 105 have now made these systems potentially competitive with existing silicon-based devices. Here, we provide an overview and critical analysis of recent progress in molecular rectification within single molecules, self-assembled monolayers, molecular multilayers, heterostructures, and metal-organic frameworks and coordination polymers. Examples of conceptually important and best-performing systems are discussed, alongside their rectification mechanisms. We present an outlook for the field, as well as prospects for the commercialization of molecular rectifiers.
Collapse
|
8
|
Sarkar S, Maiti SK. Helical Molecule as an Efficient Rectifier: Effects of Molecular Conformation and Transverse Electric Field. Chemphyschem 2022; 23:e202200485. [PMID: 35938540 DOI: 10.1002/cphc.202200485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Revised: 08/05/2022] [Indexed: 01/05/2023]
Abstract
The phenomenon of charge current rectification is critically investigated using a single stranded helical molecule in presence of transverse electric field. Two different helical molecules, DNA and protein, are taken into account to explore the specific roles of molecular conformation on rectification, which have not been addressed so far to the best of our concern. Sandwiching the molecular system within source and drain electrodes, we compute charge currents for two bias polarities and the degree of current rectification based on non-equilibrium Green's function formalism within a tight-binding framework. At non-zero electric field, site energies of the molecule are modulated in a cosine form, similar to the well known Aubry-André-Harper relation, resulting an atypical and fragmented energy band spectrum. The appearance of non-uniform site energies plays the central role for generating different currents in two bias polarities, and thus, the current rectification. We find that a high degree of current rectification can be established using the helical system and it becomes more effective for the protein molecule than the DNA one. At the end, the rectification operation considering a more general helical structure is discussed to make the present communication a self-contained one. Our proposition may provide a new route of getting controlled current rectification using similar kind of biological molecules and other tailor made helical geometries.
Collapse
Affiliation(s)
- Suparna Sarkar
- Physics and Applied Mathematics Unit, Indian Statistical Institute, 203 Barrackpore Trunk Road, Kolkata, 700 108, India
| | - Santanu K Maiti
- Physics and Applied Mathematics Unit, Indian Statistical Institute, 203 Barrackpore Trunk Road, Kolkata, 700 108, India
| |
Collapse
|
9
|
Majhi J, Maiti SK, Ganguly S. Enhanced current rectification in graphene nanoribbons: effects of geometries and orientations of nanopores. NANOTECHNOLOGY 2022; 33:255704. [PMID: 35294939 DOI: 10.1088/1361-6528/ac5e6f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Accepted: 03/15/2022] [Indexed: 06/14/2023]
Abstract
We discuss the possibility of getting rectification operation in graphene nanoribbon (GNR). For a system to be a rectifier, it must be physically asymmetric and we induce the asymmetry in GNR by introducing nanopores. The rectification properties are discussed for differently structured nanopores. We find that shape and orientation of the nanopores are critical and sensitive to the degree of current rectification. As the choice of Fermi energy is crucial for obtaining significant current rectification, explicit dependence of Fermi energy on the degree of current rectification is also studied for a particular shape of the nanopore. Finally, the role of nanopore size and different spatial distributions of the electrostatic potential profile across the GNR are explored. The stability of the nanopores is also discussed with a possible solution. Given the simplicity of the proposed method and promising results, the present proposition may lead to a new route of getting current rectification in different kinds of materials where nanopores can be formed selectively.
Collapse
Affiliation(s)
- Joydeep Majhi
- Physics and Applied Mathematics Unit, Indian Statistical Institute, 203 Barrackpore Trunk Road, Kolkata-700 108, India
| | - Santanu K Maiti
- Physics and Applied Mathematics Unit, Indian Statistical Institute, 203 Barrackpore Trunk Road, Kolkata-700 108, India
| | - Sudin Ganguly
- Department of Physics, School of Applied Sciences, University of Science and Technology, Techno City, Kiling Road, Baridua 9th Mile, Ri-Bhoi, Meghalaya-793 101, India
| |
Collapse
|
10
|
Ghandchi M, Darvish G, Moravvej-Farshi MK. Photoelectrical properties of integrated photodetectors based on bilayer graphene quantum dots with asymmetric metal contacts: a NEGF-DFT study. Phys Chem Chem Phys 2021; 24:1590-1597. [PMID: 34942635 DOI: 10.1039/d1cp04957g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We propose investigating the electro-optical properties of photodetectors based on mono- and bilayer graphene quantum dots or nanodots (GNDs). These photodetectors consist of dissimilar metals (gold, silver and titanium) that are in contact with the GNDs. To obtain photoelectrical characteristics, we employed density functional theory to solve the non-equilibrium Green's function. Photo-responsivities and quantum efficiencies obtained for these nanostructures were far better than those for structures based on graphene nanoribbons. Among the proposed photodetectors, the best performance belonged to the bilayer structures illuminated by in-plane polarized incident light. The proposed photodetectors operate without a need for externally applied voltage and are suitable for parallel light propagation using directional couplers based on the evanescent field of incident light; hence, they have applications in optical integrated circuits.
Collapse
Affiliation(s)
- Majid Ghandchi
- Department of Electrical Engineering, Ahar Branch, Islamic Azad University, Ahar 5451116714, Iran
| | - Ghafar Darvish
- Department of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran 1477893855, Iran.
| | - Mohammad Kazem Moravvej-Farshi
- Nano Plasmo-Photonic Research Group, Faculty of Electrical and Computer Engineering, Tarbiat Modares University, Tehran 1411713116, Iran
| |
Collapse
|
11
|
Djurišić I, Jovanović VP, Dražić MS, Tomović AŽ, Zikic R. Predicting Finite-Bias Tunneling Current Properties from Zero-Bias Features: The Frontier Orbital Bias Dependence at an Exemplar Case of DNA Nucleotides in a Nanogap. NANOMATERIALS 2021; 11:nano11113021. [PMID: 34835784 PMCID: PMC8624643 DOI: 10.3390/nano11113021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2021] [Revised: 11/05/2021] [Accepted: 11/08/2021] [Indexed: 01/06/2023]
Abstract
The electrical current properties of single-molecule sensing devices based on electronic (tunneling) transport strongly depend on molecule frontier orbital energy, spatial distribution, and position with respect to the electrodes. Here, we present an analysis of the bias dependence of molecule frontier orbital properties at an exemplar case of DNA nucleotides in the gap between H-terminated (3, 3) carbon nanotube (CNT) electrodes and its relation to transversal current rectification. The electronic transport properties of this simple single-molecule device, whose characteristic is the absence of covalent bonding between electrodes and a molecule between them, were obtained using density functional theory and non-equilibrium Green's functions. As in our previous studies, we could observe two distinct bias dependences of frontier orbital energies: the so-called strong and the weak pinning regimes. We established a procedure, from zero-bias and empty-gap characteristics, to estimate finite-bias electronic tunneling transport properties, i.e., whether the molecular junction would operate in the weak or strong pinning regime. We also discuss the use of the zero-bias approximation to calculate electric current properties at finite bias. The results from this work could have an impact on the design of new single-molecule applications that use tunneling current or rectification applicable in high-sensitivity sensors, protein, or DNA sequencing.
Collapse
|
12
|
Xie Z, Bâldea I, Nguyen QV, Frisbie CD. Quantitative analysis of weak current rectification in molecular tunnel junctions subject to mechanical deformation reveals two different rectification mechanisms for oligophenylene thiols versus alkane thiols. NANOSCALE 2021; 13:16755-16768. [PMID: 34604892 DOI: 10.1039/d1nr04410a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Metal-molecule-metal junctions based on alkane thiol (CnT) and oligophenylene thiol (OPTn) self-assembled monolayers (SAMs) and Au electrodes are expected to exhibit similar electrical asymmetry, as both junctions have one chemisorbed Au-S contact and one physisorbed, van der Waals contact. Asymmetry is quantified by the current rectification ratio RR apparent in the current-voltage (I-V) characteristics. Here we show that RR < 1 for CnT and RR > 1 for OPTn junctions, in contrast to expectation, and further, that RR behaves very differently for CnT and OPTn junctions under mechanical extension using the conducting probe atomic force microscopy (CP-AFM) testbed. The analysis presented in this paper, which leverages results from the previously validated single level model and ab initio quantum chemical calculations, allows us to explain the puzzling experimental findings for CnT and OPTn in terms of different current rectification mechanisms. Specifically, in CnT-based junctions the Stark effect creates the HOMO level shifting necessary for rectification, while for OPTn junctions the level shift arises from position-dependent coupling of the HOMO wavefunction with the junction electrostatic potential profile. On the basis of these mechanisms, our quantum chemical calculations allow quantitative description of the impact of mechanical deformation on the measured current rectification. Additionally, our analysis, matched to experiment, facilitates direct estimation of the impact of intramolecular electrostatic screening on the junction potential profile. Overall, our examination of current rectification in benchmark molecular tunnel junctions illuminates key physical mechanisms at play in single step tunneling through molecules, and demonstrates the quantitative agreement that can be obtained between experiment and theory in these systems.
Collapse
Affiliation(s)
- Zuoti Xie
- Department of Materials Science and Engineering, Guangdong Technion-Israel Institute of Technology, Shantou, Guangdong, 515063, China.
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota, 55455, USA.
| | - Ioan Bâldea
- Theoretical Chemistry, Heidelberg University, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany.
| | - Quyen Van Nguyen
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota, 55455, USA.
| | - C Daniel Frisbie
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota, 55455, USA.
| |
Collapse
|
13
|
Zhang Y, Park SJ. Phosphorization-derived MoP@MoO3-x nanowires for selective photocatalytic oxidation of benzyl alcohol to benzaldehyde. J Catal 2021. [DOI: 10.1016/j.jcat.2020.11.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
|
14
|
Kaur N, Kaur J, Kumar R, Kaur R. To inquire the effects of different geometric electrodes on current characteristics of C 24 fullerene molecular junction. J Mol Model 2021; 27:47. [PMID: 33491115 DOI: 10.1007/s00894-020-04653-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 12/20/2020] [Indexed: 11/25/2022]
Abstract
Two different types of geometric electrode configurations were utilized to form C24 fullerene based molecular junction. The C24 molecule was intercalated in-between gold electrodes with two different shapes viz. knife edge and flat edge and the resultant molecular junctions (MJs) were simulated using nonequilibrium Green's function combined with semiempirical extended Huckel theory (EHT). Different transport parameters, namely projected device density of states, current-voltage curve, differential conductance curve, molecular orbitals, and transmission spectra were investigated at discrete bias voltages to gain insight about the various transport phenomena occurring in these molecular junctions. The results show that when the C24 fullerene is placed in between the flat-edged electrodes, current and conductance are higher in magnitude in comparison to the knife-edged configuration. These deductions give us a new perspective to design advanced molecular devices for electronics applications in the future.
Collapse
Affiliation(s)
- Navneet Kaur
- Department of Electronics Technology, Guru Nanak Dev University, Amritsar, Punjab, 143005, India
| | - Jupinder Kaur
- Department of Electronics Technology, Guru Nanak Dev University, Amritsar, Punjab, 143005, India.
| | - Ravinder Kumar
- Department of Electronics Technology, Guru Nanak Dev University, Amritsar, Punjab, 143005, India
| | - Rupinderjit Kaur
- Department of Electronics Technology, Guru Nanak Dev University, Amritsar, Punjab, 143005, India
| |
Collapse
|
15
|
Ganguly S, Maiti SK. Electronic transport through a driven quantum wire: possible tuning of junction current, circular current and induced local magnetic field. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 33:045301. [PMID: 33065558 DOI: 10.1088/1361-648x/abc200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 10/16/2020] [Indexed: 06/11/2023]
Abstract
We propose a new route of getting controlled electron transmission through a molecular wire having a single loop geometry, by irradiating the loop with an arbitrarily polarized light. Along with conventional junction current, a new current called bias driven circular current can be established in the loop under certain conditions depending on the junction configuration. This current, on the other hand, induces a strong magnetic field that can even reach to few tesla. All the physical phenomena can be regulated selectively by adjusting the irradiation parameters. In addition, we put forward another new route of regulating transport behavior by introducing a new path due to the proximity of the contact electrodes for a typical junction configuration. Employing a tight-binding framework, we include the effect of light irradiation within a minimal coupling scheme following the well known Floquet ansatz. Using the wave-guide theory we compute two-terminal transmission probability, and the currents are determined through the Landauer-Büttiker formalism. The present analysis may be utilized to investigate transport phenomena in any other molecular wires as well as tailor-made geometries having simple and/or complex loop sub-structures.
Collapse
Affiliation(s)
- Sudin Ganguly
- Physics and Applied Mathematics Unit, Indian Statistical Institute, 203 Barrackpore Trunk Road, Kolkata-700 108, India
| | - Santanu K Maiti
- Physics and Applied Mathematics Unit, Indian Statistical Institute, 203 Barrackpore Trunk Road, Kolkata-700 108, India
| |
Collapse
|
16
|
Adenine based molecular junction as biosensor for detection of toxic phosgene gas. J Mol Model 2020; 26:172. [PMID: 32524298 DOI: 10.1007/s00894-020-04427-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2020] [Accepted: 05/18/2020] [Indexed: 10/24/2022]
Abstract
The possibility of adsorption of toxic phosgene gas (COCl2) molecule on one of the nucleobase of DNA-adenine-has been analyzed using the first principle calculations based on density function theory. In accordance with the geometry of the nucleobase, two possible positions have been considered for effective adsorption of gas molecule. The calculations performed on adsorption energies suggest that the gas molecule is able to physisorb at both the considered positions with negligibly small values of charge transfer. The in-depth analysis of electron charge densities depicts that there is no orbital overlapping between the gas molecule and adenine. We observe a significant variation of transport properties of adenine-based molecular junction on adsorption of phosgene molecule while calculation the transport parameters at both the equilibrium as well as non-equilibrium. Also, the variation of HOMO-LUMO gap of adenine molecule on adsorption of phosgene leads to alteration of current and voltage, thus implying that adenine-based sensor can be effectively utilized to sense the presence of phosgene gas in a given environment. Small adsorption energies and recovery time suggest that the rate of desorption of phosgene is very high; thus, the proposed adenine sensor can be effectively used as a highly stable and selective reusable sensor.
Collapse
|
17
|
Covalent organic hollow nanospheres constructed by using AIE-active units for nitrophenol explosives detection. Sci China Chem 2020. [DOI: 10.1007/s11426-019-9667-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
18
|
First principle approach to elucidate transport properties through L-glutamic acid-based molecular devices using symmetrical electrodes. J Mol Model 2020; 26:74. [PMID: 32146585 DOI: 10.1007/s00894-020-4323-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 02/23/2020] [Indexed: 10/24/2022]
Abstract
Protein-based electronics is one of the emerging technology in which inventive electronic devices are being adduced and developed based on the selective actions of specific proteins. The explicit actions can be predicted if the building blocks of proteins (i.e., amino acids) are studied decorously. We emphasize our work on electronic transport properties of L-glutamic acid (i.e., L-amino acid) stringed to gold, silver, and copper electrodes, respectively, to form three distinct devices. For our calculations, we employ NEGF-DFT approach using self-consistent function. Electronic coupling and tunneling barriers between the molecule and the electrodes have been emphasized with an inception of delocalization of molecular orbitals within the device. We observe strong correlation between tunneling barrier and Mulliken charge transfer between molecule and electrodes. The asymmetrical carbon chain (-CH2) within the molecule exhibits negative differential resistance (NDR) and rectification ratio. The device using molecule with copper electrodes exhibits the highest peak to valley current ratio of 1.84. The rectification ratio of the device with gold, silver, and copper electrodes is 2.35, 2.25, and 15.62, respectively, at finite bias. These results yield fresh insight on the potential of L-glutamic acid like bio-molecule in the emerging field of proteotronics.
Collapse
|
19
|
Jiang R, Lu G, Yan Z, Wu D, Liu J, Zhang X. Enhanced photocatalytic activity of a hydrogen bond-assisted 2D/2D Z-scheme SnNb2O6/Bi2WO6 system: Highly efficient separation of photoinduced carriers. J Colloid Interface Sci 2019; 552:678-688. [DOI: 10.1016/j.jcis.2019.05.104] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 05/26/2019] [Accepted: 05/31/2019] [Indexed: 12/26/2022]
|
20
|
Cho SJ, Kong GD, Park S, Park J, Byeon SE, Kim T, Yoon HJ. Molecularly Controlled Stark Effect Induces Significant Rectification in Polycyclic-Aromatic-Hydrocarbon-Terminated n-Alkanethiolates. NANO LETTERS 2019; 19:545-553. [PMID: 30582703 DOI: 10.1021/acs.nanolett.8b04488] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The variation of the electronic structure of individual molecules as a function of the applied bias matters for the performance of molecular and organic electronic devices. Understanding the structure-electric-field relationship, however, remains a challenge because of the lack of in-operando spectroscopic technique and complexity arising from the ill-defined on-surface structure of molecules and organic-electrode interfaces within devices. We report that a reliable and reproducible molecular diode can be achieved by control of the conjugation length in polycyclic-aromatic-hydrocarbon (PAH)-terminated n-alkanethiolate (denoted as SC11PAH), incorporated into liquid-metal-based large-area tunnel junctions in the form of a self-assembled monolayer. By taking advantage of the structural simplicity and tunability of SC11PAH and the high-yielding feature of the junction technique, we demonstrate that the increase in the conjugation length of the PAH terminal group leads to a significant rectification ratio up to ∼1.7 × 102 at ±740 mV. Further study suggests that the Stark shift of the molecular energy resonance of the PAH breaks the symmetry of the energy topography across the junction and induces rectification in a temperature-independent charge-transport regime.
Collapse
Affiliation(s)
- Soo Jin Cho
- Department of Chemistry , Korea University , Seoul 136-701 , Korea
| | - Gyu Don Kong
- Department of Chemistry , Korea University , Seoul 136-701 , Korea
| | - Sohyun Park
- Department of Chemistry , Korea University , Seoul 136-701 , Korea
| | - Jeongwoo Park
- Department of Physics , Hankuk University of Foreign Studies , Yongin 449-791 , Korea
| | - Seo Eun Byeon
- Department of Chemistry , Korea University , Seoul 136-701 , Korea
| | - Taekyeong Kim
- Department of Physics , Hankuk University of Foreign Studies , Yongin 449-791 , Korea
| | - Hyo Jae Yoon
- Department of Chemistry , Korea University , Seoul 136-701 , Korea
| |
Collapse
|
21
|
Zhao P, Chen G. Spin-polarized and thermospin-polarized transport properties of phthalocyanine dimer based molecular junction with different transition metal atoms. J Chem Phys 2018; 149:134305. [PMID: 30292195 DOI: 10.1063/1.5047081] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Based on the first-principles density functional theory combined with the non-equilibrium Green's function method, we have studied the spin-polarized and thermospin-polarized transport properties of phthalocyanine (Pc) dimer based molecular junction with different transition metal (TM = Mn, Fe, Co, Ni) atoms. Our results show that the spin-polarized and thermospin-polarized transport properties can be effectively tuned by changing the central TM atoms, and only the MnPc dimer system exhibits perfect spin/thermal-spin filtering and sizeable giant magnetoresistance (GMR)/thermal-GMR effects. Meantime, the MnPc dimer system reveals a low-bias negative differential resistance effect under the parallel magnetic configuration. These findings suggest that the MnPc dimer system has great potential in developing the high-performance multifunctional spintronic and spin caloritronic devices.
Collapse
Affiliation(s)
- P Zhao
- School of Physics and Technology, University of Jinan, Jinan 250022, China
| | - G Chen
- School of Physics and Technology, University of Jinan, Jinan 250022, China
| |
Collapse
|
22
|
Kong GD, Jin J, Thuo M, Song H, Joung JF, Park S, Yoon HJ. Elucidating the Role of Molecule–Electrode Interfacial Defects in Charge Tunneling Characteristics of Large-Area Junctions. J Am Chem Soc 2018; 140:12303-12307. [DOI: 10.1021/jacs.8b08146] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gyu Don Kong
- Department of Chemistry, Korea University, Seoul 02841, Korea
| | - Junji Jin
- Department of Chemistry, Korea University, Seoul 02841, Korea
| | - Martin Thuo
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, United States
| | - Hyunsun Song
- Department of Chemistry, Korea University, Seoul 02841, Korea
| | | | - Sungnam Park
- Department of Chemistry, Korea University, Seoul 02841, Korea
| | - Hyo Jae Yoon
- Department of Chemistry, Korea University, Seoul 02841, Korea
| |
Collapse
|
23
|
Jin J, Kong GD, Yoon HJ. Deconvolution of Tunneling Current in Large-Area Junctions Formed with Mixed Self-Assembled Monolayers. J Phys Chem Lett 2018; 9:4578-4583. [PMID: 30063358 DOI: 10.1021/acs.jpclett.8b01997] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Whereas single-component self-assembled monolayers (SAMs) have served widely as organic components in molecular and organic electronics, how the performance of the device is influenced by the heterogeneity of monolayers has been little understood. This paper describes charge transport by quantum tunneling across mixed SAMs of n-alkanethiolates of different lengths formed on ultraflat template-stripped gold substrate. Electrical characterization using liquid metal comprising eutectic gallium-indium alloy reveals that the surface topography of monolayer largely depends on the difference in length between the thiolates and is translated into distribution of tunneling current density. As the length difference is more significant, more phase segregation takes place, leading to an increase in the modality of Gaussian fitting curves. Consequently, statistical analysis permits access to deconvolution of tunneling currents, mirroring the phase-segregated surface. Our work provides an insight into the role of surface topography in the performance of molecular-scale electronic devices.
Collapse
Affiliation(s)
- Junji Jin
- Department of Chemistry , Korea University , Seoul 02841 , Korea
| | - Gyu Don Kong
- Department of Chemistry , Korea University , Seoul 02841 , Korea
| | - Hyo Jae Yoon
- Department of Chemistry , Korea University , Seoul 02841 , Korea
| |
Collapse
|
24
|
Abstract
This paper reviews the present status of unimolecular electronics (UME). The field started in the 1970s with a hope that some day organic molecules (∼2 nm in size), when used as electronic components, would challenge Si-based inorganic electronics in ultimate-high-density integrated circuits. The technological push to ever smaller inorganic device sizes (Moore's "law") was driven by a profit motive and by vast investments. UME, the underfunded pauper, may have lost that "race to the bottom", but some excellent science is left to be done.
Collapse
Affiliation(s)
- Robert Melville Metzger
- Laboratory for Molecular Electronics, Department of Chemistry and Biochemistry, University of Alabama, Box 870336, Tuscaloosa, AL 35487-0336, USA.
| |
Collapse
|
25
|
Rodriguez-Gonzalez S, Xie Z, Galangau O, Selvanathan P, Norel L, Van Dyck C, Costuas K, Frisbie CD, Rigaut S, Cornil J. HOMO Level Pinning in Molecular Junctions: Joint Theoretical and Experimental Evidence. J Phys Chem Lett 2018; 9:2394-2403. [PMID: 29660279 DOI: 10.1021/acs.jpclett.8b00575] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A central issue in molecular electronics in order to build functional devices is to assess whether changes in the electronic structure of isolated compounds by chemical derivatization are retained once the molecules are inserted into molecular junctions. Recent theoretical studies have suggested that this is not always the case due to the occurrence of pinning effects making the alignment of the transporting levels insensitive to the changes in the electronic structure of the isolated systems. We explore here this phenomenon by investigating at both the experimental and theoretical levels the I/ V characteristics of molecular junctions incorporating three different three-ring phenylene ethynylene derivatives designed to exhibit a significant variation of the HOMO level in the isolated state. At the theoretical level, our NEGF/DFT calculations performed on junctions including the three compounds show that, whereas the HOMO of the molecules varies by 0.61 eV in the isolated state, their alignment with respect to the Fermi level of the gold electrodes in the junction is very similar (within 0.1 eV). At the experimental level, the SAMs made of the three compounds have been contacted by a conducting AFM probe to measure their I/ V characteristics. The alignment of the HOMO with respect to the Fermi level of the gold electrodes has been deduced by fitting the I/ V curves, using a model based on a single-level description (Newns-Anderson model). The extracted values are found to be very similar for the three derivatives, in full consistency with the theoretical predictions, thus providing clear evidence for a HOMO level pinning effect.
Collapse
Affiliation(s)
- S Rodriguez-Gonzalez
- Laboratory for Chemistry of Novel Materials , University of Mons , B-7000 Mons , Belgium
| | - Z Xie
- Department of Chemical Engineering and Materials Science , and Department of Chemistry , University of Minnesota , Minneapolis , Minnesota 55455 , United States
| | - O Galangau
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226 , Rennes F-3500 , France
| | - P Selvanathan
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226 , Rennes F-3500 , France
| | - L Norel
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226 , Rennes F-3500 , France
| | - C Van Dyck
- National Institute for Nanotechnology (NINT) , University of Alberta , Edmonton , Alberta T6G 2M9 , Canada
| | - K Costuas
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226 , Rennes F-3500 , France
| | - C D Frisbie
- Department of Chemical Engineering and Materials Science , and Department of Chemistry , University of Minnesota , Minneapolis , Minnesota 55455 , United States
| | - S Rigaut
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226 , Rennes F-3500 , France
| | - J Cornil
- Laboratory for Chemistry of Novel Materials , University of Mons , B-7000 Mons , Belgium
| |
Collapse
|
26
|
Song P, Guerin S, Tan SJR, Annadata HV, Yu X, Scully M, Han YM, Roemer M, Loh KP, Thompson D, Nijhuis CA. Stable Molecular Diodes Based on π-π Interactions of the Molecular Frontier Orbitals with Graphene Electrodes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:1706322. [PMID: 29356141 DOI: 10.1002/adma.201706322] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Revised: 12/01/2017] [Indexed: 06/07/2023]
Abstract
In molecular electronics, it is important to control the strength of the molecule-electrode interaction to balance the trade-off between electronic coupling strength and broadening of the molecular frontier orbitals: too strong coupling results in severe broadening of the molecular orbitals while the molecular orbitals cannot follow the changes in the Fermi levels under applied bias when the coupling is too weak. Here, a platform based on graphene bottom electrodes to which molecules can bind via π-π interactions is reported. These interactions are strong enough to induce electronic function (rectification) while minimizing broadening of the molecular frontier orbitals. Molecular tunnel junctions are fabricated based on self-assembled monolayers (SAMs) of Fc(CH2 )11 X (Fc = ferrocenyl, X = NH2 , Br, or H) on graphene bottom electrodes contacted to eutectic alloy of gallium and indium top electrodes. The Fc units interact more strongly with graphene than the X units resulting in SAMs with the Fc at the bottom of the SAM. The molecular diodes perform well with rectification ratios of 30-40, and they are stable against bias stressing under ambient conditions. Thus, tunnel junctions based on graphene with π-π molecule-electrode coupling are promising platforms to fabricate stable and well-performing molecular diodes.
Collapse
Affiliation(s)
- Peng Song
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Sarah Guerin
- Department of Physics, Bernal Institute, University of Limerick, Limerick, V94 T9PX, Ireland
| | - Sherman Jun Rong Tan
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Harshini Venkata Annadata
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Xiaojiang Yu
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - Micheál Scully
- Department of Physics, Bernal Institute, University of Limerick, Limerick, V94 T9PX, Ireland
| | - Ying Mei Han
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Max Roemer
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Kian Ping Loh
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
- Centre for Advanced 2D Materials, Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore, 117546, Singapore
| | - Damien Thompson
- Department of Physics, Bernal Institute, University of Limerick, Limerick, V94 T9PX, Ireland
| | - Christian A Nijhuis
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
- Centre for Advanced 2D Materials, Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore, 117546, Singapore
- NUSNNI-Nanocore, National University of Singapore, Singapore, 117411, Singapore
| |
Collapse
|
27
|
Yuan S, Wang S, Kong Z, Xu Z, Yang L, Wang D, Ling Q, Wang Y. Theoretical Studies of the Spin-Dependent Electronic Transport Properties in Ethynyl-Terminated Ferrocene Molecular Junctions. MICROMACHINES 2018; 9:mi9030095. [PMID: 30424029 PMCID: PMC6187227 DOI: 10.3390/mi9030095] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 02/08/2018] [Accepted: 02/14/2018] [Indexed: 11/16/2022]
Abstract
The spin-dependent electron transport in the ferrocene-based molecular junctions, in which the molecules are 1,3-substituted and 1,3′-substituted ethynyl ferrocenes, respectively, is studied by the theoretical simulation with nonequilibrium Green’s function and density functional theory. The calculated results suggest that the substitution position of the terminal ethynyl groups has a great effect on the spin-dependent current-voltage properties and the spin filtering efficiency of the molecular junctions. At the lower bias, high spin filtering efficiency is found in 1,3′-substituted ethynyl ferrocene junction, which suggests that the spin filtering efficiency is also dependent on the bias voltage. The different spin-dependent transport properties for the two molecular junctions originate from their different evolutions of spin-up and spin-down energy levels.
Collapse
Affiliation(s)
- Shundong Yuan
- College of Science, China University of Petroleum, Qingdao 266580, China.
| | - Shiyan Wang
- College of Science, China University of Petroleum, Qingdao 266580, China.
| | - Zhaoyang Kong
- College of Science, China University of Petroleum, Qingdao 266580, China.
| | - Zhijie Xu
- College of Science, China University of Petroleum, Qingdao 266580, China.
| | - Long Yang
- Research Institute of Experiment and Detection of PetroChina Xinjiang Oilfield Company, Karamay 834000, China.
| | - Diansheng Wang
- College of Science, China University of Petroleum, Qingdao 266580, China.
| | - Qidan Ling
- College of Materials Science and Engineering, Fujian Key Laboratory of Polymer Materials, Fujian Normal University, Fuzhou 350007, China.
| | - Yudou Wang
- College of Science, China University of Petroleum, Qingdao 266580, China.
| |
Collapse
|
28
|
Towards Rectifying Performance at the Molecular Scale. Top Curr Chem (Cham) 2017; 375:85. [DOI: 10.1007/s41061-017-0170-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Accepted: 09/22/2017] [Indexed: 01/09/2023]
|
29
|
Smerdon JA, Darancet P, Guest JR. Spatially resolved, substrate-induced rectification in C60 bilayers on copper. J Chem Phys 2017. [DOI: 10.1063/1.4975795] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- J. A. Smerdon
- Jeremiah Horrocks Institute of Mathematics, Physics and
Astronomy, University of Central Lancashire, Preston PR1 2HE,
United Kingdom
| | - P. Darancet
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - J. R. Guest
- Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA
| |
Collapse
|
30
|
El-Nahas AM, Gamea A, El-Hendawy MM, Yoshizawa K. Electrical conductivity of dithiophene-based diblock molecular junctions. COMPUT THEOR CHEM 2017. [DOI: 10.1016/j.comptc.2016.11.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
31
|
Koepf M, Koenigsmann C, Ding W, Batra A, Negre CFA, Venkataraman L, Brudvig GW, Batista VS, Schmuttenmaer CA, Crabtree RH. Controlling the rectification properties of molecular junctions through molecule-electrode coupling. NANOSCALE 2016; 8:16357-16362. [PMID: 27722662 DOI: 10.1039/c6nr04830g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The development of molecular components functioning as switches, rectifiers or amplifiers is a great challenge in molecular electronics. A desirable property of such components is functional robustness, meaning that the intrinsic functionality of components must be preserved regardless of the strategy used to integrate them into the final assemblies. Here, this issue is investigated for molecular diodes based on N-phenylbenzamide (NPBA) backbones. The transport properties of molecular junctions derived from NPBA are characterized while varying the nature of the functional groups interfacing the backbone and the gold electrodes required for break-junction measurements. Combining experimental and theoretical methods, it is shown that at low bias (<0.85 V) transport is determined by the same frontier molecular orbital originating from the NPBA core, regardless of the anchoring group employed. The magnitude of rectification, however, is strongly dependent on the strength of the electronic coupling at the gold-NPBA interface and on the spatial distribution of the local density of states of the dominant transport channel of the molecular junction.
Collapse
Affiliation(s)
- Matthieu Koepf
- Department of Chemistry & Energy Sciences Institute, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, USA.
| | - Christopher Koenigsmann
- Department of Chemistry & Energy Sciences Institute, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, USA.
| | - Wendu Ding
- Department of Chemistry & Energy Sciences Institute, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, USA.
| | - Arunbah Batra
- Department of Applied Physics and Applied Mathematics, Columbia University, Mail Code: 4701, New York, NY 10027, USA.
| | - Christian F A Negre
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Latha Venkataraman
- Department of Applied Physics and Applied Mathematics, Columbia University, Mail Code: 4701, New York, NY 10027, USA.
| | - Gary W Brudvig
- Department of Chemistry & Energy Sciences Institute, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, USA.
| | - Victor S Batista
- Department of Chemistry & Energy Sciences Institute, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, USA.
| | - Charles A Schmuttenmaer
- Department of Chemistry & Energy Sciences Institute, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, USA.
| | - Robert H Crabtree
- Department of Chemistry & Energy Sciences Institute, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, USA.
| |
Collapse
|
32
|
Perrin ML, Galán E, Eelkema R, Thijssen JM, Grozema F, van der Zant HSJ. A gate-tunable single-molecule diode. NANOSCALE 2016; 8:8919-8923. [PMID: 27071686 DOI: 10.1039/c6nr00735j] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
In the pursuit of down-sizing electronic components, the ultimate limit is the use of single molecules as functional devices. The first theoretical proposal of such a device, predicted more than four decades ago, is the seminal Aviram-Ratner rectifier that exploits the orbital structure of the molecule. The experimental realization of single-molecule rectifiers, however, has proven to be challenging. In this work, we report on the experimental realization of a gate-tunable single-molecule rectifier with rectification ratios as high as 600. The rectification mechanism arises from the molecular structure and relies on the presence of two conjugated sites that are weakly coupled through a saturated linker. The observed gate dependence not only demonstrates tunability of the rectification ratio, it also shows that the proposed rectification mechanism based on the orbital structure is operative in the molecule.
Collapse
Affiliation(s)
- Mickael L Perrin
- Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.
| | | | | | | | | | | |
Collapse
|
33
|
Smerdon JA, Giebink NC, Guisinger NP, Darancet P, Guest JR. Large Spatially Resolved Rectification in a Donor-Acceptor Molecular Heterojunction. NANO LETTERS 2016; 16:2603-7. [PMID: 26964012 DOI: 10.1021/acs.nanolett.6b00171] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We demonstrate that rectification ratios (RR) of ≳250 (≳1000) at biases of 0.5 V (1.2 V) are achievable at the two-molecule limit for donor-acceptor bilayers of pentacene on C60 on Cu using scanning tunneling spectroscopy and microscopy. Using first-principles calculations, we show that the system behaves as a molecular Schottky diode with a tunneling transport mechanism from semiconducting pentacene to Cu-hybridized metallic C60. Low-bias RRs vary by two orders-of-magnitude at the edge of these molecular heterojunctions due to increased Stark shifts and confinement effects.
Collapse
Affiliation(s)
- Joseph A Smerdon
- Jeremiah Horrocks Institute of Mathematics, Physics and Astronomy, University of Central Lancashire , Preston, PR1 2HE, United Kingdom
| | - Noel C Giebink
- Department of Electrical Engineering, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Nathan P Guisinger
- Center for Nanoscale Materials, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Pierre Darancet
- Center for Nanoscale Materials, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Jeffrey R Guest
- Center for Nanoscale Materials, Argonne National Laboratory , Argonne, Illinois 60439, United States
| |
Collapse
|
34
|
Xiang D, Wang X, Jia C, Lee T, Guo X. Molecular-Scale Electronics: From Concept to Function. Chem Rev 2016; 116:4318-440. [DOI: 10.1021/acs.chemrev.5b00680] [Citation(s) in RCA: 816] [Impact Index Per Article: 102.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Dong Xiang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
- Key
Laboratory of Optical Information Science and Technology, Institute
of Modern Optics, College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300071, China
| | - Xiaolong Wang
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
| | - Chuancheng Jia
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
| | - Takhee Lee
- Department
of Physics and Astronomy, and Institute of Applied Physics, Seoul National University, Seoul 08826, Korea
| | - Xuefeng Guo
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory for
Structural Chemistry of Unstable and Stable Species, College of Chemistry
and Molecular Engineering, Peking University, Beijing 100871, China
- Department
of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
| |
Collapse
|
35
|
Garrigues AR, Yuan L, Wang L, Singh S, del Barco E, Nijhuis CA. Temperature dependent charge transport across tunnel junctions of single-molecules and self-assembled monolayers: a comparative study. Dalton Trans 2016; 45:17153-17159. [PMID: 27775126 DOI: 10.1039/c6dt03204d] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
In this work we present a comparative study of the temperature behavior of charge current in both single-molecule transistors and self-assembled monolayer-based tunnel junctions with ferrocene molecules.
Collapse
Affiliation(s)
| | - Li Yuan
- Department of Chemistry
- National University of Singapore
- Singapore 117543
- Singapore
| | - Lejia Wang
- Department of Chemistry
- National University of Singapore
- Singapore 117543
- Singapore
- School of Chemical Engineering
| | | | | | - Christian A. Nijhuis
- Department of Chemistry
- National University of Singapore
- Singapore 117543
- Singapore
- Centre for Advanced 2D Materials
| |
Collapse
|
36
|
Xu X, Li W, Zhou X, Wang Q, Feng J, Tian WQ, Jiang Y. Theoretical study of electron tunneling through the spiral molecule junctions along spiral paths. Phys Chem Chem Phys 2016; 18:3765-71. [DOI: 10.1039/c5cp06726j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A theoretical study of electron transport in spiral-shaped molecules along spiral paths is executed by the first principles calculations.
Collapse
Affiliation(s)
- Xiaodong Xu
- Department of Physics
- Harbin Institute of Technology
- Harbin
- P. R. China
| | - Weiqi Li
- Department of Physics
- Harbin Institute of Technology
- Harbin
- P. R. China
| | - Xin Zhou
- Institute of Theoretical and Simulational Chemistry
- Academy of Fundamental and Interdisciplinary Sciences
- Harbin Institute of Technology
- Harbin
- P. R. China
| | - Qiang Wang
- Department of Applied Chemistry
- College of Science
- Nanjing Tech University
- Nanjing
- P. R. China
| | - Jikang Feng
- Institute of Theoretical Chemistry and College of Chemistry Jilin University
- Changchun
- P. R. China
| | - Wei Quan Tian
- College of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- P. R. China
| | - Yongyuan Jiang
- Department of Physics
- Harbin Institute of Technology
- Harbin
- P. R. China
| |
Collapse
|
37
|
Pejov L, Petreska I, Kocarev L. Designing field-controllable graphene-dot-graphene single molecule switches: A quantum-theoretical proof-of-concept under realistic operating conditions. J Chem Phys 2015; 143:244704. [PMID: 26723699 DOI: 10.1063/1.4937411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A theoretical proof of the concept that a particularly designed graphene-based moletronics device, constituted by two semi-infinite graphene subunits, acting as source and drain electrodes, and a central benzenoid ring rotator (a "quantum dot"), could act as a field-controllable molecular switch is outlined and analyzed with the density functional theory approach. Besides the ideal (0 K) case, we also consider the operation of such a device under realistic operating (i.e., finite-temperature) conditions. An in-depth insight into the physics behind device controllability by an external field was gained by thorough analyses of the torsional potential of the dot under various conditions (absence or presence of an external gating field with varying strength), computing the torsional correlation time and transition probabilities within the Bloembergen-Purcell-Pound formalism. Both classical and quantum mechanical tunneling contributions to the intramolecular rotation were considered in the model. The main idea that we put forward in the present study is that intramolecular rotors can be controlled by the gating field even in cases when these groups do not possess a permanent dipole moment (as in cases considered previously by us [I. Petreska et al., J. Chem. Phys. 134, 014708-1-014708-12 (2011)] and also by other groups [P. E. Kornilovitch et al., Phys. Rev. B 66, 245413-1-245413-7 (2002)]). Consequently, one can control the molecular switching properties by an external electrostatic field utilizing even nonpolar intramolecular rotors (i.e., in a more general case than those considered so far). Molecular admittance of the currently considered graphene-based molecular switch under various conditions is analyzed employing non-equilibrium Green's function formalism, as well as by analysis of frontier molecular orbitals' behavior.
Collapse
Affiliation(s)
- Ljupčo Pejov
- Department of Physical Chemistry, Institute of Chemistry, SS. Cyril and Methodius University, Arhimedova 5, P.O. Box 162, 1001 Skopje, Republic of Macedonia
| | - Irina Petreska
- Institute of Physics, Faculty of Natural Sciences and Mathematics, SS. Cyril and Methodius University, P.O. Box 162, 1001 Skopje, Republic of Macedonia
| | - Ljupčo Kocarev
- Macedonian Academy of Sciences and Arts, Krste Misirkov 2, P.O. Box 428, 1000 Skopje, Republic of Macedonia
| |
Collapse
|
38
|
Ding W, Koepf M, Koenigsmann C, Batra A, Venkataraman L, Negre CFA, Brudvig GW, Crabtree RH, Schmuttenmaer CA, Batista VS. Computational Design of Intrinsic Molecular Rectifiers Based on Asymmetric Functionalization of N-Phenylbenzamide. J Chem Theory Comput 2015; 11:5888-96. [DOI: 10.1021/acs.jctc.5b00823] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wendu Ding
- Department of Chemistry, Yale University, P.O. Box 208107, New
Haven, Connecticut 06520-8107, United States
- Yale Energy Sciences Institute, Yale University, P.O.
Box 27394, West Haven, Connecticut 06516-7394, United States
| | - Matthieu Koepf
- Yale Energy Sciences Institute, Yale University, P.O.
Box 27394, West Haven, Connecticut 06516-7394, United States
| | - Christopher Koenigsmann
- Yale Energy Sciences Institute, Yale University, P.O.
Box 27394, West Haven, Connecticut 06516-7394, United States
| | - Arunabh Batra
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
| | - Latha Venkataraman
- Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, United States
| | - Christian F. A. Negre
- Department of Chemistry, Yale University, P.O. Box 208107, New
Haven, Connecticut 06520-8107, United States
- Yale Energy Sciences Institute, Yale University, P.O.
Box 27394, West Haven, Connecticut 06516-7394, United States
| | - Gary W. Brudvig
- Department of Chemistry, Yale University, P.O. Box 208107, New
Haven, Connecticut 06520-8107, United States
- Yale Energy Sciences Institute, Yale University, P.O.
Box 27394, West Haven, Connecticut 06516-7394, United States
| | - Robert H. Crabtree
- Department of Chemistry, Yale University, P.O. Box 208107, New
Haven, Connecticut 06520-8107, United States
- Yale Energy Sciences Institute, Yale University, P.O.
Box 27394, West Haven, Connecticut 06516-7394, United States
| | - Charles A. Schmuttenmaer
- Department of Chemistry, Yale University, P.O. Box 208107, New
Haven, Connecticut 06520-8107, United States
- Yale Energy Sciences Institute, Yale University, P.O.
Box 27394, West Haven, Connecticut 06516-7394, United States
| | - Victor S. Batista
- Department of Chemistry, Yale University, P.O. Box 208107, New
Haven, Connecticut 06520-8107, United States
- Yale Energy Sciences Institute, Yale University, P.O.
Box 27394, West Haven, Connecticut 06516-7394, United States
| |
Collapse
|
39
|
Sherif S, Rubio-Bollinger G, Pinilla-Cienfuegos E, Coronado E, Cuevas JC, Agraït N. Current rectification in a single molecule diode: the role of electrode coupling. NANOTECHNOLOGY 2015; 26:291001. [PMID: 26133791 DOI: 10.1088/0957-4484/26/29/291001] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We demonstrate large rectification ratios (> 100) in single-molecule junctions based on a metal-oxide cluster (polyoxometalate), using a scanning tunneling microscope (STM) both at ambient conditions and at low temperature. These rectification ratios are the largest ever observed in a single-molecule junction, and in addition these junctions sustain current densities larger than 10(5) A cm(-2). By following the variation of the I-V characteristics with tip-molecule separation we demonstrate unambiguously that rectification is due to asymmetric coupling to the electrodes of a molecule with an asymmetric level structure. This mechanism can be implemented in other type of molecular junctions using both organic and inorganic molecules and provides a simple strategy for the rational design of molecular diodes.
Collapse
Affiliation(s)
- Siya Sherif
- Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanoscience), Faraday, 9, Ciudad Universitaria de Cantoblanco, 28049, Madrid, Spain. Departamento de Física de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Facultad de Ciencias, c/ Francisco Tomás y Valiente, 7 Universidad Autónoma de Madrid 28049 Madrid, Spain
| | | | | | | | | | | |
Collapse
|
40
|
Karan S, Jacob D, Karolak M, Hamann C, Wang Y, Weismann A, Lichtenstein AI, Berndt R. Shifting the Voltage Drop in Electron Transport Through a Single Molecule. PHYSICAL REVIEW LETTERS 2015; 115:016802. [PMID: 26182113 DOI: 10.1103/physrevlett.115.016802] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Indexed: 06/04/2023]
Abstract
A Mn-porphyrin was contacted on Au(111) in a low-temperature scanning tunneling microscope (STM). Differential conductance spectra show a zero-bias resonance that is due to an underscreened Kondo effect according to many-body calculations. When the Mn center is contacted by the STM tip, the spectrum appears to invert along the voltage axis. A drastic change in the electrostatic potential of the molecule involving a small geometric relaxation is found to cause this observation.
Collapse
Affiliation(s)
- Sujoy Karan
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - David Jacob
- Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany
| | - Michael Karolak
- Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Christian Hamann
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Yongfeng Wang
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - Alexander Weismann
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | | | - Richard Berndt
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| |
Collapse
|
41
|
Jothi M, Kumaradhas P. Probing the effect of electric field in 9,10-dimethoxy-2,6-bis(2- p-tolylethynyl)anthracene molecular nanowire using quantum chemical and charge density analysis. MOLECULAR SIMULATION 2015. [DOI: 10.1080/08927022.2013.879471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
42
|
Controlling the direction of rectification in a molecular diode. Nat Commun 2015; 6:6324. [DOI: 10.1038/ncomms7324] [Citation(s) in RCA: 165] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Accepted: 01/18/2015] [Indexed: 02/06/2023] Open
|
43
|
Li H, Su TA, Zhang V, Steigerwald ML, Nuckolls C, Venkataraman L. Electric Field Breakdown in Single Molecule Junctions. J Am Chem Soc 2015; 137:5028-33. [DOI: 10.1021/ja512523r] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Haixing Li
- Department
of Applied Physics and Applied Mathematics and ‡Department of
Chemistry, Columbia University, New York, New York 10027, United States
| | - Timothy A. Su
- Department
of Applied Physics and Applied Mathematics and ‡Department of
Chemistry, Columbia University, New York, New York 10027, United States
| | - Vivian Zhang
- Department
of Applied Physics and Applied Mathematics and ‡Department of
Chemistry, Columbia University, New York, New York 10027, United States
| | - Michael L. Steigerwald
- Department
of Applied Physics and Applied Mathematics and ‡Department of
Chemistry, Columbia University, New York, New York 10027, United States
| | - Colin Nuckolls
- Department
of Applied Physics and Applied Mathematics and ‡Department of
Chemistry, Columbia University, New York, New York 10027, United States
| | - Latha Venkataraman
- Department
of Applied Physics and Applied Mathematics and ‡Department of
Chemistry, Columbia University, New York, New York 10027, United States
| |
Collapse
|
44
|
Liu H, He Y, Zhang J, Zhao J, Chen L. A theoretical study of asymmetric electron transport through linearly aromatic molecules. Phys Chem Chem Phys 2015; 17:4558-68. [PMID: 25583004 DOI: 10.1039/c4cp03887h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electron transport through a series of polyacene molecules connected via a π-conjugated bridge (an anthracene molecule) was investigated theoretically by using the nonequilibrium Green's function formalism combined with density functional theory. The results have shown that the asymmetric current-voltage characteristics can be achieved by tuning the position of a side π-bridge linked to the main conjugated backbone. The detailed analyses of the spatial distribution of molecular orbitals as well as the current density interpret how the location of π-bridge strongly affects the intramolecular electronic coupling. The rectification in the molecular junction arises from the localization of the molecular orbitals near the Fermi level and the asymmetric shift of molecule orbital energy levels under positive and negative bias. The rectification ratio decreases with increasing the length of the π-bridge which improves intramolecular electronic coupling between aromatic rings. Furthermore, the rectification properties of conjugated molecules are just slightly affected by the anchoring positions of thiol groups. These results demonstrated that the location and the length of π-bridge, which induce the asymmetric intramolecular coupling, play key roles in the rectification of the linearly aromatic molecules.
Collapse
Affiliation(s)
- Hongmei Liu
- Institute of Condensed Matter Physics, Linyi University, Shuangling Road, Linyi 276000, P. R. China
| | | | | | | | | |
Collapse
|
45
|
Shao J, Zhang XY, Zheng Y, Wang B, Chen Y. Length-dependent rectification and negative differential resistance in heterometallic n-alkanedithiol junctions. RSC Adv 2015. [DOI: 10.1039/c4ra14999h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The transport properties of heterometallic n-alkanedithiol junctions were investigated via first-principles calculations.
Collapse
Affiliation(s)
- Jian Shao
- State Key Laboratory of Optoelectronic Materials and Technologies
- School of Physics and Engineering
- Sun Yat-sen University
- Guangzhou
- China
| | - X. Y. Zhang
- State Key Laboratory of Optoelectronic Materials and Technologies
- School of Physics and Engineering
- Sun Yat-sen University
- Guangzhou
- China
| | - Yue Zheng
- State Key Laboratory of Optoelectronic Materials and Technologies
- School of Physics and Engineering
- Sun Yat-sen University
- Guangzhou
- China
| | - Biao Wang
- State Key Laboratory of Optoelectronic Materials and Technologies
- School of Physics and Engineering
- Sun Yat-sen University
- Guangzhou
- China
| | - Yun Chen
- State Key Laboratory of Optoelectronic Materials and Technologies
- School of Physics and Engineering
- Sun Yat-sen University
- Guangzhou
- China
| |
Collapse
|
46
|
Hahn T, Liebing S, Kortus J. A gate controlled molecular switch based on picene-F₄TCNQ charge-transfer material. NANOSCALE 2014; 6:14508-14513. [PMID: 25347765 DOI: 10.1039/c4nr02455a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We show that the recently synthesized charge-transfer material picene-F₄TCNQ can be used as a gate-voltage controlled molecular switch. The picene-F₄TCNQ system is compared with the extensively characterized anthraquinone-based molecular system, which is known to exhibit large switching ratios due to quantum interference effects. In the case of picene-F₄TCNQ we find switching ratios larger by one order of magnitude. Further, our calculations reveal that the picene-F₄TCNQ system resembles remarkably well the I-V characteristics of a classical diode. The reverse-bias current of this molecular diode can be increased two orders of magnitude by an external gate voltage. Based on density-functional theory calculations we show that the hybrid states formed by the picene-F₄TCNQ system play the key role in determining transport properties. We further conclude that the tuning of quantum transport properties through hybrid states is a general concept which opens a new route towards functional materials for molecular electronics.
Collapse
Affiliation(s)
- Torsten Hahn
- TU Freiberg, Institute of Theoretical Physics, Leipziger Str. 23, D-09596 Freiberg, Germany.
| | | | | |
Collapse
|
47
|
Hu G, Zhang G, Li Y, Ren J, Wang C. Proportion effect in diblock co-oligomer molecular diodes. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.09.043] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
48
|
Brito da Silva Júnior CA, Leal JFP, Aleixo VFP, Pinheiro FA, Del Nero J. Electronic transport, transition-voltage spectroscopy, and the Fano effect in single molecule junctions composed of a biphenyl molecule attached to metallic and semiconducting carbon nanotube electrodes. Phys Chem Chem Phys 2014; 16:19602-7. [PMID: 25109887 DOI: 10.1039/c4cp00016a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have investigated electronic transport in a single-molecule junction composed of a biphenyl molecule attached to a p-doped semiconductor and metallic carbon nanotube leads. We find that the current-voltage characteristics are asymmetric as a result of the different electronic natures of the right and left leads, which are metallic and semiconducting, respectively. We provide an analysis of transition voltage spectroscopy in such a system by means of both Fowler-Nordheim and Lauritsen-Millikan plots; this analysis allows one to identify the positions of resonances and the regions where the negative differential conductance occurs. We show that transmittance curves are well described by the Fano lineshape, for both direct and reverse bias, demonstrating that the frontier molecular orbitals are effectively involved in the transport process. This result gives support to the interpretation of transition voltage spectroscopy based on the coherent transport model.
Collapse
|
49
|
Charge transport and rectification in molecular junctions formed with carbon-based electrodes. Proc Natl Acad Sci U S A 2014; 111:10928-32. [PMID: 25024198 DOI: 10.1073/pnas.1406926111] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Molecular junctions formed using the scanning-tunneling-microscope-based break-junction technique (STM-BJ) have provided unique insight into charge transport at the nanoscale. In most prior work, the same metal, typically Au, Pt, or Ag, is used for both tip and substrate. For such noble metal electrodes, the density of electronic states is approximately constant within a narrow energy window relevant to charge transport. Here, we form molecular junctions using the STM-BJ technique, with an Au metal tip and a microfabricated graphite substrate, and measure the conductance of a series of graphite/amine-terminated oligophenyl/Au molecular junctions. The remarkable mechanical strength of graphite and the single-crystal properties of our substrates allow measurements over few thousand junctions without any change in the surface properties. We show that conductance decays exponentially with molecular backbone length with a decay constant that is essentially the same as that for measurements with two Au electrodes. More importantly, despite the inherent symmetry of the oligophenylamines, we observe rectification in these junctions. State-of-art ab initio conductance calculations are in good agreement with experiment, and explain the rectification. We show that the highly energy-dependent graphite density of states contributes variations in transmission that, when coupled with an asymmetric voltage drop across the junction, leads to the observed rectification. Together, our measurements and calculations show how functionality may emerge from hybrid molecular-scale devices purposefully designed with different electrodes beyond the so-called "wide band limit," opening up the possibility of assembling molecular junctions with dissimilar electrodes using layered 2D materials.
Collapse
|
50
|
Zhang J, Guo L. Theoretical investigations of structures and properties of Au and S substituted poly (2,3-di-(4′-hydroxyphenyl)-1,4-phenylene ethynyl) at different electric field intensities. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2014. [DOI: 10.1142/s0219633614500254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Theoretical investigations on Au and S substituted poly (2,3-di-(4′-hydroxyphenyl)-1,4-phenylene ethynyl) as a molecular wire have been carried out by incorporating the external electric field (EF). The results demonstrate that both geometric and electronic structures of conjugated molecular wire are sensitive to EF. The Z component of the dipole moment and total dipole moment increases continuously since EF polarizes the molecule. Static EF modifies the frontline molecular orbitals and HLG. The I-V curve indicates the symmetrical trend respect to the original point.
Collapse
Affiliation(s)
- Jian Zhang
- School of Chemistry and Material Science, Shanxi Normal University, Linfen 041004, P. R. China
| | - Li Guo
- School of Chemistry and Material Science, Shanxi Normal University, Linfen 041004, P. R. China
| |
Collapse
|