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Singh AK, Gao W, Deb P. Twist Proximity-Endowed Large Figure of Merit in a Band-Modulated CrI 3/1T-MoS 2 Moiré Superlattice. ACS APPLIED MATERIALS & INTERFACES 2024; 16:35438-35446. [PMID: 38937139 DOI: 10.1021/acsami.4c04269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/29/2024]
Abstract
Moiré superlattices with a robust twist proximity effect in the low-dimensional regime can facilitate nanoscale thermoelectric devices. In pristine systems, the low efficiency and lack of proficient control of thermoelectric properties impede desirable advancements in the field of energy conversion. In the present study, we demonstrate remarkable macroscopic thermoelectric response as a consequence of microscopic band structure modulation via the twist proximity in an engineered CrI3/1T-MoS2 moiré superlattice. The local twist effect, which leads to the microscopic phenomena of electron localization, results in a comprehensive electronic structure modulation. Consequently, these local effects convolute the macroscopic thermoelectric effect. Additionally, flat bands and angle-dependent metallic to semiconducting transitions are observed at 10.89, 23.41, and 30° twist angles. We correlate the observed phenomenon with the augmented spin-charge transport and interconversion via the twist proximity effect in its semiconducting phase. The estimated ultralow electronic and lattice thermal conductivities further corroborate with the observed large figure of merit and Seebeck coefficient. The maximum values of the Seebeck coefficient and figure of merit are estimated to be ∼413 μV/K and ∼4.3 at 200 K for 30° under the constant time relaxation approach. The twist-endowed outstanding thermoelectric effect in moiré superlattices with band modulation unveils a distinctive approach to establish efficient thermoelectric devices.
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Affiliation(s)
- Anil Kumar Singh
- Department of Physics, Tezpur University (Central University), Tezpur 784028, India
| | - Weibo Gao
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 639798, Singapore
| | - Pritam Deb
- Department of Physics, Tezpur University (Central University), Tezpur 784028, India
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2
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Zeng J, Zhang Y, Zeng S, Li J, Fang Y, Qian L, Pubu L, Chen S. First-principles calculation on electronic properties of hydrogen evolution reaction of Ni-based electrode surfaces with different monatomic doping. J Mol Graph Model 2024; 130:108790. [PMID: 38749235 DOI: 10.1016/j.jmgm.2024.108790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 05/05/2024] [Accepted: 05/09/2024] [Indexed: 05/31/2024]
Abstract
At present, the hydrogen evolution reaction (HER) of Ni-based electrode has an important influence on water electrolysis hydrogen production technology, involving complex electrochemical process of electrode. In this project, Materials Studio (MS) software was used to design and construct Ni-based electrode surface (NES) models with monatomic Mo, Co, Fe, Cr doping, and the NES models attached 1 H atom and 2H atoms were denoted as the NES-H models and NES-2H model, respectively. Then the first-principles calculation was carried out. The results showed that the doping of different atoms can effectively change the work function of the pure Ni. In the charge transfer process of the four NES-2H models, the distance between the two H atoms is most affected by Mo doping, and they leave the Ni electrode surface as a single H ion, respectively, while the effect on Co, Fe and Cr doping is relatively consistent, and they leave the Ni electrode surface with H2 molecules, respectively. The doping of four single atoms changes the distance of valence band (VB) top and conduction band (CB) bottom from Fermi level in NES, NES-H and NES-2H models, and affects the HER, in which Mo doping has the greatest effect. The TDOS of the above models is mainly derived from the PDOS of the d orbitals of the doped atoms and Ni atoms. The results will provide a theoretical basis for the research and development of Ni-based electrode materials in HER.
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Affiliation(s)
- Jianping Zeng
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China; Department of Chemistry, Nanjing University of Science and Technology, Nanjing, 210094, China
| | - Yan Zhang
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China
| | - Shuyu Zeng
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China
| | - Jingwen Li
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China
| | - Yuchen Fang
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China
| | - Ling Qian
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China
| | - Luobu Pubu
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China
| | - Song Chen
- School of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng, 224051, China.
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Zanib M, Iqbal MW, Ullah H, Almutairi BS, Laref A. Study of half-metallic ferromagnetism and transport characteristics of double perovskites Sr 2AIrO 6 (A = Y, Lu, Sc) for spintronic applications. RSC Adv 2024; 14:17877-17887. [PMID: 38836171 PMCID: PMC11149398 DOI: 10.1039/d4ra03417a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2024] [Accepted: 05/20/2024] [Indexed: 06/06/2024] Open
Abstract
The precise manipulation of electromagnetic and thermoelectric characteristics in the miniaturization of electronic devices offers a promising foundation for practical applications in quantum computing. Double perovskites characterized by stability, non-toxicity, and spin polarization, have emerged as appealing candidates for spintronic applications. This study explores the theoretical elucidation of the influence of iridium's 5d electrons on the magnetic characteristics of Sr2AIrO6 (A = Y, Lu, Sc) with WIEN2k code. The determined formation energies confirm the thermodynamic stability while an analysis of band structure and the density of states (DOS) reveals a half-metallic ferromagnetic character. This characteristic is comprehensible through the analysis of exchange constants and exchange energies. The current analysis suggests that crystal field effects, a fundamental hybridization process and exchange energies contribute to the emergence of ferromagnetism due to electron-spin interactions. Finally, assessments of electrical and thermal conductivities, Seebeck coefficient, power factor, figure of merit and magnetic susceptibility are conducted to assess the potential of the investigated materials for the applications in thermoelectric devices.
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Affiliation(s)
- Maiza Zanib
- Department of Physics, Riphah International University Lahore Campus 56000 Pakistan
| | - M Waqas Iqbal
- Department of Physics, Riphah International University Lahore Campus 56000 Pakistan
| | - Hamid Ullah
- Department of Physics, Riphah International University Lahore Campus 56000 Pakistan
| | - Badriah S Almutairi
- Department of Physics, College of Science, Princess Nourah bint Abdulrahman University P.O. Box 84428 Riyadh 11671 Saudi Arabia
| | - A Laref
- Department of Physics and Astronomy, College of Science, King Saud University Riyadh 11451 Kingdom of Saudi Arabia
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Gautam S, Gupta DC. Exploring the structural, mechanical, magneto-electronic and thermophysical properties of f electron based XNpO 3 perovskites (X = Na, Cs, Ca, Ra). Sci Rep 2024; 14:8918. [PMID: 38637539 PMCID: PMC11026492 DOI: 10.1038/s41598-024-57341-2] [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: 12/27/2023] [Accepted: 03/18/2024] [Indexed: 04/20/2024] Open
Abstract
Here, we present systematic investigation of the structural and mechanical stability, electronic profile and thermophysical properties of f-electron based XNPO3 (X = Na, Cs, Ca, Ra) perovskites by first principles calculations. The structural optimization, tolerance factor criteria depicts the cubic structural stability of these alloys. Further, the stability of these materials is also determined by the cohesive and formation energy calculations along with mechanical stability criteria. The electronic structure is explored by calculating band structure and density of states which reveal the well-known half-metallic nature of the materials. Further, we have calculated different thermodynamic parameters including specific heat capacity, thermal expansion, Gruneisen parameter and their variation with temperature and pressure. The thermoelectric effectiveness of these materials is predicted in terms of Seebeck coefficient, electrical conductivity and power factor. All-inclusive we can say that calculated properties of these half-metallic materials extend their route in spintronics, thermoelectric and radioisotope generators device applications.
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Affiliation(s)
- Sakshi Gautam
- Condensed Matter Theory Group, School of Studies in Physics, Jiwaji University, Gwalior, Madhya Pradesh, India
| | - Dinesh C Gupta
- Condensed Matter Theory Group, School of Studies in Physics, Jiwaji University, Gwalior, Madhya Pradesh, India.
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Ganie NA, Mir SA, Gupta DC. Tantalum half-Heusler alloys RbTaSi and RbTaGe: potential candidates for desirable thermoelectric and spintronic applications. RSC Adv 2023; 13:7087-7101. [PMID: 36875886 PMCID: PMC9977415 DOI: 10.1039/d3ra00146f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2023] [Accepted: 02/13/2023] [Indexed: 03/05/2023] Open
Abstract
Heusler alloys have drawn the interest of researchers due to their possible technical significances and multifunctional use. Herein, a thorough theoretical analysis using "density functional theory (DFT)" is performed to investigate the general physical features of RbTaSi and RbTaGe alloys. The "generalised gradient approximation (GGA)" and "Tran-Blaha modified Becke-Johnson (TB-mBJ) potential" has been incorporated to model the electronic structures of RbTaSi and RbTaGe. The structural optimization results signify that these materials are stable in the ferromagnetic phase with a cubic F4̄3m structure, which is supported by the computed elastic parameters. In addition, cohesive energy and microhardness signify strong bonding. The spin-polarisation bands and density of states indicate the half-metallic nature of these materials. These materials have spin magnetic moment 2μB, thereby emphasizing the use of these alloys for spintronic applications. Transport and thermodynamic properties have been calculated, and their temperature dependence is illustrated. The behavior of transport coefficients with temperature futher implies the presence of half-metallic nature.
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Affiliation(s)
- Nisar Ahmad Ganie
- Condensed Matter Theory Group, School of Studies in Physics, Jiwaji University Gwalior-474011 India
| | - Shabir A Mir
- Condensed Matter Theory Group, School of Studies in Physics, Jiwaji University Gwalior-474011 India
| | - Dinesh C Gupta
- Condensed Matter Theory Group, School of Studies in Physics, Jiwaji University Gwalior-474011 India
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Kazim MZ, Yaseen M, Aldaghfag SA, Ishfaq M, Nazar M, Misbah, Zahid M, Neffati R. DFT study of optoelectronic and thermoelectric properties of cubic Ba2ZrMO6(M = Ce, Ti) double perovskites. J SOLID STATE CHEM 2022. [DOI: 10.1016/j.jssc.2022.123419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Kazim MZ, Yaseen M, Ghaffar A, Bhatti IA. Physical Properties of Ba2XIO6 (X = Ag, Na) Double Perovskite Oxides for Energy Harvesting Devices. ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING 2022. [DOI: 10.1007/s13369-022-06985-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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8
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Assadullah I, Malik JH, Shafi A, Tomar R. Growth of crystalline WO 3-ZnSe nanocomposites: an approach to optical, electrochemical, and catalytic properties. Sci Rep 2022; 12:3962. [PMID: 35273263 PMCID: PMC8913615 DOI: 10.1038/s41598-022-07951-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 02/16/2022] [Indexed: 01/10/2023] Open
Abstract
In this study, novel growth of WO3-ZnSe nanocomposites was carried out by a simple, low-cost hydrothermal process under subcritical conditions and is reported for the first time in just 5 h. The products were characterized in detail by multiform techniques: X-ray diffraction, scanning electron microscopy (SEM), optical studies, and Fourier transform analysis. The influence of ZnSe on the structural, morphological, compositional, optical, and catalytic properties of WO3 is demonstrated. The WO3 metal oxide material is grown in a hexagonal crystal structure with wide-band-gap and has been modified by ZnSe to form a composite nanostructures in the nanoscale range. The electrochemical properties of the prepared materials were studied by cyclic voltammetry, which revealed that the synthesized material exhibited remarkable electrochemical supercapacitive activity. Moreover, the composite nanostructures showed excellent photocatalytic activity for degradation of phenol and almost 93% of phenol was degraded with good recyclability and stability. According to The International Commission on Illumination (CIE), the synthesized nanomaterial shows blue emission and is suitable for blue LEDs.
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Affiliation(s)
- Insaaf Assadullah
- School of Studies in Chemistry, Jiwaji University, Gwalior, 474011, India.
| | - Javied Hamid Malik
- School of Studies in Chemistry, Jiwaji University, Gwalior, 474011, India
| | - Adil Shafi
- Environmental Research Laboratory, Department of Chemistry, Aligarh Muslim University, Aligarh, Uttar Pradesh, 202002, India
| | - Radha Tomar
- School of Studies in Chemistry, Jiwaji University, Gwalior, 474011, India
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Zaraq A, Gregory DH, Orayech B, Igartua JM, El Bouari A, Eales JD, Bingham PA, Gesing TM. Effects of iron substitution and anti-site disorder on crystal structures, vibrational, optical and magnetic properties of double perovskites Sr 2(Fe 1−xNi x)TeO 6. Dalton Trans 2022; 51:17368-17380. [DOI: 10.1039/d2dt02447k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We report a new series of DP Sr2(Fe1−xNix)TeO6, which have different transition metal Fe and Ni on B sites, providing an opportunity to investigate their effect on crystal structure, vibrational, optical and magnetic properties.
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Affiliation(s)
- Asmaa Zaraq
- University of Bremen, Institute of Inorganic Chemistry and Crystallography, Bremen, Germany
- WestCHEM School of Chemistry, University of Glasgow, Joseph Black Building, Glasgow G12 8QQ, UK
| | - Duncan H. Gregory
- WestCHEM School of Chemistry, University of Glasgow, Joseph Black Building, Glasgow G12 8QQ, UK
| | - Brahim Orayech
- Maxam, Technology Center Energetic Materials, Carretera N-623 km 28., 09141 Quintanilla Sobresierra. Burgos, Spain
| | - Josu M. Igartua
- Universidad del País Vasco/Euskal Herriko Unibertsitatea UPV/EHU: Leioa, Bizkaia, España
| | - Abdeslam El Bouari
- Laboratory of Physical-Chemistry, Materials and Catalysis, Department of Chemistry, Faculty of Sciences Ben M'Sik, University Hassan II of Casablanca, Casablanca, Morocco
| | - James D. Eales
- Materials and Engineering Research Institute, Sheffield Hallam University, City Campus, Howard Street, Sheffield, S1 1WB, UK
| | - Paul A. Bingham
- Materials and Engineering Research Institute, Sheffield Hallam University, City Campus, Howard Street, Sheffield, S1 1WB, UK
| | - Thorsten M. Gesing
- University of Bremen, Institute of Inorganic Chemistry and Crystallography, Bremen, Germany
- University of Bremen, MAPEX Center for Materials and Processes, Bremen, Germany
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Mohebpour MA, Mozvashi SM, Vishkayi SI, Tagani MB. Thermoelectric characteristics of X[Formula: see text]YH[Formula: see text] monolayers (X=Si, Ge; Y=P, As, Sb, Bi): a first-principles study. Sci Rep 2021; 11:23840. [PMID: 34903762 PMCID: PMC8668932 DOI: 10.1038/s41598-021-03280-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2021] [Accepted: 10/29/2021] [Indexed: 11/08/2022] Open
Abstract
Ever since global warming emerged as a serious issue, the development of promising thermoelectric materials has been one of the main hot topics of material science. In this work, we provide an in-depth understanding of the thermoelectric properties of X[Formula: see text]YH[Formula: see text] monolayers (X=Si, Ge; Y=P, As, Sb, Bi) using the density functional theory combined with the Boltzmann transport equation. The results indicate that the monolayers have very low lattice thermal conductivities in the range of 0.09-0.27 Wm[Formula: see text]K[Formula: see text] at room temperature, which are correlated with the atomic masses of primitive cells. Ge[Formula: see text]PH[Formula: see text] and Si[Formula: see text]SbH[Formula: see text] possess the highest mobilities for hole (1894 cm[Formula: see text]V[Formula: see text]s[Formula: see text]) and electron (1629 cm[Formula: see text]V[Formula: see text]s[Formula: see text]), respectively. Si[Formula: see text]BiH[Formula: see text] shows the largest room-temperature figure of merit, [Formula: see text] in the n-type doping ( [Formula: see text] cm[Formula: see text]), which is predicted to reach 3.49 at 800 K. Additionally, Si[Formula: see text]SbH[Formula: see text] and Si[Formula: see text]AsH[Formula: see text] are found to have considerable ZT values above 2 at room temperature. Our findings suggest that the mentioned monolayers are more efficient than the traditional thermoelectric materials such as Bi[Formula: see text]Te[Formula: see text] and stimulate experimental efforts for novel syntheses and applications.
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Affiliation(s)
- Mohammad Ali Mohebpour
- Computational Nanophysics Laboratory (CNL), Department of physics, University of Guilan, P. O. Box 41335-1914, Rasht, Iran
| | - Shobair Mohammadi Mozvashi
- Computational Nanophysics Laboratory (CNL), Department of physics, University of Guilan, P. O. Box 41335-1914, Rasht, Iran
| | - Sahar Izadi Vishkayi
- School of Physics, Institute for Research in Fundamental Sciences (IPM), P. O. Box 19395-5531, Tehran, Iran
| | - Meysam Bagheri Tagani
- Computational Nanophysics Laboratory (CNL), Department of physics, University of Guilan, P. O. Box 41335-1914, Rasht, Iran
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Mero RD, Ogawa K, Yamada S, Liu HL. Optical Studies on the Phase Transitions in YBaMn 2O 6 Single Crystals. ACS OMEGA 2021; 6:22137-22150. [PMID: 34497905 PMCID: PMC8412917 DOI: 10.1021/acsomega.1c02763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 08/13/2021] [Indexed: 06/13/2023]
Abstract
The double perovskite YBaMn2O6 exhibited complex structural, magnetic, and charge/orbital ordering phase transitions. In this paper, we investigated the correlation between the temperature-dependent optical response and complex phase transitions of YBaMn2O6 single crystals through spectroscopic ellipsometry and Raman scattering spectroscopy. The room temperature optical absorption spectrum of YBaMn2O6 revealed three bands of approximately 1.50, 4.05, and 5.49 eV. The lowest optical absorption band was assigned to on-site d-d transitions in Mn ions, whereas the other two optical features were assigned to charge-transfer transitions between the 2p states of O and 3d states of Mn. The room temperature Raman scattering spectrum revealed 25 phonon modes. Notably, the MnO6 octahedral tilting and bending modes between 360 and 440 cm-1 increased in intensity at temperatures <200 K. Furthermore, several new phonon peaks appeared at temperatures <200 K, which were associated with charge ordering. Additionally, the magnetic order-induced changes were observed in the breathing modes, with reduced intensity of the 620 cm-1 and a substantial enhancement of the 644 cm-1 phonon peaks. The Jahn-Teller mode at approximately 496 cm-1 exhibited strong hardening at temperatures <200 K, which indicated a linear correlation with the square of the magnetic susceptibility and thus revealed the occurrence of spin-phonon coupling. Anomalies in the phonon frequency, line width, and intensity observed near the phase transition temperatures highlighted the importance of lattice-charge-spin interactions in YBaMn2O6.
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Affiliation(s)
- Rea Divina Mero
- Department
of Physics, National Taiwan Normal University, Taipei 11677, Taiwan
| | - Kirari Ogawa
- Department
of Material System Science, Yokohama City
University, Yokohama 236-0027, Japan
| | - Shigeki Yamada
- Department
of Material System Science, Yokohama City
University, Yokohama 236-0027, Japan
| | - Hsiang-Lin Liu
- Department
of Physics, National Taiwan Normal University, Taipei 11677, Taiwan
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Nabi M, Gupta DC. Potential lead-free small band gap halide double perovskites Cs 2CuMCl 6 (M = Sb, Bi) for green technology. Sci Rep 2021; 11:12945. [PMID: 34155308 PMCID: PMC8217524 DOI: 10.1038/s41598-021-92443-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2021] [Accepted: 06/07/2021] [Indexed: 02/05/2023] Open
Abstract
Explorations of stable lead-free perovskites have currently achieved substantial interest to overcome the instability and avoid toxicity related issue faced with the lead-based perovskites. In this study, we have comprehensively studied the stability, nature and origin of electronic, transport and optical properties of inorganic halide double perovskites, which could provide a better understanding of their possible potential applications. The density functional theory is used to investigate the different physical properties of these materials. The stability of these cubic materials is validated by optimizing the structure, tolerance factor, mechanical stability test. The materials are small band gap semiconductors with outshining optoelectronic performance. Due to high optical absorption, high conductivity and low reflectivity they have great potential to be used for optoelectronic application purpose. Because of small band gap we have also investigated the variation of various transport parameters with chemical potential. The semiconducting nature of materials results in ZT close to unity predicting its excellent application in thermoelectric technology.
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Affiliation(s)
- Muskan Nabi
- Condensed Matter Theory Group, School of Studies in Physics, Jiwaji University, Gwalior, 474 011, India
| | - Dinesh C Gupta
- Condensed Matter Theory Group, School of Studies in Physics, Jiwaji University, Gwalior, 474 011, India.
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