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Ibrahem MA, Waris M, Miah MR, Shabani F, Canimkurbey B, Unal E, Delikanli S, Demir HV. Orientation-Dependent Photoconductivity of Quasi-2D Nanocrystal Self-Assemblies: Face-Down, Edge-Up Versus Randomly Oriented Quantum Wells. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2401423. [PMID: 38770984 DOI: 10.1002/smll.202401423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 04/30/2024] [Indexed: 05/22/2024]
Abstract
Here, strongly orientation-dependent lateral photoconductivity of a CdSe monolayer colloidal quantum wells (CQWs) possessing short-chain ligands is reported. A controlled liquid-air self-assembly technique is utilized to deliberately engineer the alignments of CQWs into either face-down (FO) or edge-up (EO) orientation on the substrate as opposed to randomly oriented (RO) CQWs prepared by spin-coating. Adapting planar configuration metal-semiconductor-metal (MSM) photodetectors, it is found that lateral conductivity spans ≈2 orders of magnitude depending on the orientation of CQWs in the film in the case of utilizing short ligands. The long native ligands of oleic acid (OA) are exchanged with short-chain ligands of 2-ethylhexane-1-thiol (EHT) to reduce the inter-platelet distance, which significantly improved the photoresponsivity from 4.16, 0.58, and 4.79 mA W-1 to 528.7, 6.17, and 94.2 mA W-1, for the MSM devices prepared with RO, FO, and EO, before and after ligands exchange, respectively. Such CQW orientation control profoundly impacts the photodetector performance also in terms of the detection speed (0.061 s/0.074 s for the FO, 0.048 s/0.060 s for the EO compared to 0.10 s/0.16 s for the RO, for the rise and decay time constants, respectively) and the detectivity (1.7 × 1010, 2.3 × 1011, and 7.5 × 1011 Jones for the FO, EO, and RO devices, respectively) which can be further tailored for the desired optoelectronic device applications. Attributed to charge transportation in colloidal films being proportional to the number of hopping steps, these findings indicate that the solution-processed orientation of CQWs provides the ability to tune the photoconductivity of CQWs with short ligands as another degree of freedom to exploit and engineer their absorptive devices.
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Affiliation(s)
- Mohammed A Ibrahem
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology and The National Nanotechnology Research Center, Bilkent University, Ankara, 06800, Turkey
- Laser Science and Technology Branch, Applied Sciences Department, University of Technology, Baghdad, 10066, Iraq
| | - Mohsin Waris
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology and The National Nanotechnology Research Center, Bilkent University, Ankara, 06800, Turkey
| | - Md Rumon Miah
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology and The National Nanotechnology Research Center, Bilkent University, Ankara, 06800, Turkey
| | - Farzan Shabani
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology and The National Nanotechnology Research Center, Bilkent University, Ankara, 06800, Turkey
| | - Betul Canimkurbey
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology and The National Nanotechnology Research Center, Bilkent University, Ankara, 06800, Turkey
- Serefeddin Health Services Vocational School, Central Research Laboratory, Amasya University, Amasya, 05100, Turkey
| | - Emre Unal
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology and The National Nanotechnology Research Center, Bilkent University, Ankara, 06800, Turkey
| | - Savas Delikanli
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology and The National Nanotechnology Research Center, Bilkent University, Ankara, 06800, Turkey
| | - Hilmi Volkan Demir
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology and The National Nanotechnology Research Center, Bilkent University, Ankara, 06800, Turkey
- Luminous! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore
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Elishav O, Blumer O, Vanderlick TK, Hirshberg B. The effect of ligands on the size distribution of copper nanoclusters: Insights from molecular dynamics simulations. J Chem Phys 2024; 160:164301. [PMID: 38647299 DOI: 10.1063/5.0202432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2024] [Accepted: 04/07/2024] [Indexed: 04/25/2024] Open
Abstract
Controlling the size distribution in the nucleation of copper particles is crucial for achieving nanocrystals with desired physical and chemical properties. However, their synthesis involves a complex system of solvents, ligands, and copper precursors with intertwining effects on the size of the nanoclusters. We combine molecular dynamics simulations and density functional theory calculations to provide insights into the nucleation mechanism in the presence of a triphenyl phosphite ligand. We identify the crucial role of the strength of the metal-phosphine interaction in inhibiting the cluster's growth. We demonstrate computationally several practical routes to fine-tune the interaction strength by modifying the side groups of the additive. Our work provides molecular insights into the complex nucleation process of protected copper nanocrystals, which can assist in controlling their size distribution and, eventually, their morphology.
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Affiliation(s)
- Oren Elishav
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, USA
- School of Chemistry, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Ofir Blumer
- School of Chemistry, Tel Aviv University, Tel Aviv 6997801, Israel
| | - T Kyle Vanderlick
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, USA
| | - Barak Hirshberg
- School of Chemistry, Tel Aviv University, Tel Aviv 6997801, Israel
- The Center for Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv 6997801, Israel
- The Ratner Center for Single Molecule Science, Tel Aviv University, Tel Aviv 6997801, Israel
- The Center for Physics and Chemistry of Living Systems, Tel Aviv University, Tel Aviv 6997801, Israel
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3
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Diroll BT, Guzelturk B, Po H, Dabard C, Fu N, Makke L, Lhuillier E, Ithurria S. 2D II-VI Semiconductor Nanoplatelets: From Material Synthesis to Optoelectronic Integration. Chem Rev 2023; 123:3543-3624. [PMID: 36724544 DOI: 10.1021/acs.chemrev.2c00436] [Citation(s) in RCA: 32] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The field of colloidal synthesis of semiconductors emerged 40 years ago and has reached a certain level of maturity thanks to the use of nanocrystals as phosphors in commercial displays. In particular, II-VI semiconductors based on cadmium, zinc, or mercury chalcogenides can now be synthesized with tailored shapes, composition by alloying, and even as nanocrystal heterostructures. Fifteen years ago, II-VI semiconductor nanoplatelets injected new ideas into this field. Indeed, despite the emergence of other promising semiconductors such as halide perovskites or 2D transition metal dichalcogenides, colloidal II-VI semiconductor nanoplatelets remain among the narrowest room-temperature emitters that can be synthesized over a wide spectral range, and they exhibit good material stability over time. Such nanoplatelets are scientifically and technologically interesting because they exhibit optical features and production advantages at the intersection of those expected from colloidal quantum dots and epitaxial quantum wells. In organic solvents, gram-scale syntheses can produce nanoparticles with the same thicknesses and optical properties without inhomogeneous broadening. In such nanoplatelets, quantum confinement is limited to one dimension, defined at the atomic scale, which allows them to be treated as quantum wells. In this review, we discuss the synthetic developments, spectroscopic properties, and applications of such nanoplatelets. Covering growth mechanisms, we explain how a thorough understanding of nanoplatelet growth has enabled the development of nanoplatelets and heterostructured nanoplatelets with multiple emission colors, spatially localized excitations, narrow emission, and high quantum yields over a wide spectral range. Moreover, nanoplatelets, with their large lateral extension and their thin short axis and low dielectric surroundings, can support one or several electron-hole pairs with large exciton binding energies. Thus, we also discuss how the relaxation processes and lifetime of the carriers and excitons are modified in nanoplatelets compared to both spherical quantum dots and epitaxial quantum wells. Finally, we explore how nanoplatelets, with their strong and narrow emission, can be considered as ideal candidates for pure-color light emitting diodes (LEDs), strong gain media for lasers, or for use in luminescent light concentrators.
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Affiliation(s)
- Benjamin T Diroll
- Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, United States
| | - Burak Guzelturk
- X-ray Science Division, Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, United States
| | - Hong Po
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213, 10 rue Vauquelin 75005 Paris, France
| | - Corentin Dabard
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213, 10 rue Vauquelin 75005 Paris, France
| | - Ningyuan Fu
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213, 10 rue Vauquelin 75005 Paris, France
| | - Lina Makke
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213, 10 rue Vauquelin 75005 Paris, France
| | - Emmanuel Lhuillier
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, 75005 Paris, France
| | - Sandrine Ithurria
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213, 10 rue Vauquelin 75005 Paris, France
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Shabani F, Dehghanpour Baruj H, Yurdakul I, Delikanli S, Gheshlaghi N, Isik F, Liu B, Altintas Y, Canımkurbey B, Demir HV. Deep-Red-Emitting Colloidal Quantum Well Light-Emitting Diodes Enabled through a Complex Design of Core/Crown/Double Shell Heterostructure. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2106115. [PMID: 34894078 DOI: 10.1002/smll.202106115] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Revised: 11/13/2021] [Indexed: 06/14/2023]
Abstract
Extending the emission peak wavelength of quasi-2D colloidal quantum wells has been an important quest to fully exploit the potential of these materials, which has not been possible due to the complications arising from the partial dissolution and recrystallization during growth to date. Here, the synthetic pathway of (CdSe/CdS)@(1-4 CdS/CdZnS) (core/crown)@(colloidal atomic layer deposition shell/hot injection shell) hetero-nanoplatelets (NPLs) using multiple techniques, which together enable highly efficient emission beyond 700 nm in the deep-red region, is proposed and demonstrated. Given the challenges of using conventional hot injection procedure, a method that allows to obtain sufficiently thick and passivated NPLs as the seeds is developed. Consequently, through the final hot injection shell coating, thick NPLs with superior optical properties including a high photoluminescence quantum yield of 88% are achieved. These NPLs emitting at 701 nm exhibit a full-width-at-half-maximum of 26 nm, enabled by the successfully maintained quasi-2D shape and minimum defects of the resulting heterostructure. The deep-red light-emitting diode (LED) device fabricated with these NPLs has shown to yield a high external quantum efficiency of 6.8% at 701 nm, which is on par with other types of LEDs in this spectral range.
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Affiliation(s)
- Farzan Shabani
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey
| | - Hamed Dehghanpour Baruj
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey
| | - Iklim Yurdakul
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey
| | - Savas Delikanli
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey
- Luminous! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Negar Gheshlaghi
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey
| | - Furkan Isik
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey
| | - Baiquan Liu
- School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou, 510275, China
| | - Yemliha Altintas
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey
- Department of Materials Science and Nanotechnology, Abdullah Gül University, Kayseri, TR-38080, Turkey
| | - Betül Canımkurbey
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey
- Central Research Laboratory, Amasya University, Amasya, 05100, Turkey
| | - Hilmi Volkan Demir
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology, Bilkent University, Ankara, 06800, Turkey
- Luminous! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
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5
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Garcia E, Arnold C, Hermier JP, D'Amico M. Gold plasmonic enhanced luminescence of silica encapsulated semiconductor hetero-nanoplatelets. NANOSCALE ADVANCES 2021; 3:4572-4578. [PMID: 36133456 PMCID: PMC9417742 DOI: 10.1039/d1na00273b] [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: 04/14/2021] [Revised: 09/22/2021] [Accepted: 06/15/2021] [Indexed: 06/16/2023]
Abstract
Optical properties of nanocrystals have the potential to drive the next generation of optoelectronic devices. However, a number of technological limitations remain to be overcome. Nanocrystals' emission is strongly impacted by the chemical environment and high excitation power. In this paper, we present a preparation route to hybrid core-shell nanoplatelets encapsulated in a gold silica shield. The induced plasmon coupling offers a higher brightness at high power excitation. We also detail the highly increased fluorescence stability offered by the silica-gold-shell protection against photobleaching processes.
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Affiliation(s)
- Emilio Garcia
- Université Paris-Saclay, UVSQ, CNRS, GEMaC 78000 Versailles France
- Nexdot 102 Avenue Gaston Roussel 93230 Romainville France
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6
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Alzakia FI, Tan SC. Liquid-Exfoliated 2D Materials for Optoelectronic Applications. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2003864. [PMID: 34105282 PMCID: PMC8188210 DOI: 10.1002/advs.202003864] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 01/19/2021] [Indexed: 05/14/2023]
Abstract
Two-dimensional (2D) materials have attracted tremendous research attention in recent days due to their extraordinary and unique properties upon exfoliation from the bulk form, which are useful for many applications such as electronics, optoelectronics, catalysis, etc. Liquid exfoliation method of 2D materials offers a facile and low-cost route to produce large quantities of mono- and few-layer 2D nanosheets in a commercially viable way. Optoelectronic devices such as photodetectors fabricated from percolating networks of liquid-exfoliated 2D materials offer advantages compared to conventional devices, including low cost, less complicated process, and higher flexibility, making them more suitable for the next generation wearable devices. This review summarizes the recent progress on metal-semiconductor-metal (MSM) photodetectors fabricated from percolating network of 2D nanosheets obtained from liquid exfoliation methods. In addition, hybrids and mixtures with other photosensitive materials, such as quantum dots, nanowires, nanorods, etc. are also discussed. First, the various methods of liquid exfoliation of 2D materials, size selection methods, and photodetection mechanisms that are responsible for light detection in networks of 2D nanosheets are briefly reviewed. At the end, some potential strategies to further improve the performance the devices are proposed.
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Affiliation(s)
- Fuad Indra Alzakia
- Department of Materials Science and EngineeringNational University of Singapore9 Engineering drive 1Singapore117574Singapore
| | - Swee Ching Tan
- Department of Materials Science and EngineeringNational University of Singapore9 Engineering drive 1Singapore117574Singapore
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7
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Choi KW, Shin C, Jun S, Park SJ, Hwang Y, Kwak JH, Park YW, Kim JW, Ju BK. Solution process manufacture of a simple, multifunctional flexible sensor based on capacitance measurement. NANOTECHNOLOGY 2021; 32:265503. [PMID: 33825697 DOI: 10.1088/1361-6528/abed73] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Accepted: 03/10/2021] [Indexed: 06/12/2023]
Abstract
Conventional sensors are rigid, involve complex processes and structures, and one sensor can detect only one type of stimulus. The manufacturing costs of such devices are high owing to the use of vacuum processes for the formation of thin films and electrodes and the complicated fabrication processes required to construct multiple layers. In addition, the multiple-layer design increases the risk of peeling due to mechanical movement. In this study, to solve the aforementioned problems, a simple two-layer multi-sensor has been fabricated using a non-vacuum solution process. The sensor consists of a light absorption layer comprising polyvinyl butyral and semiconductor particles and a top layer comprising two spiral-shaped Ag nanowire electrodes. The sensor experiences minimal damage by external adhesives and has a light-sensitive optical response at 420 nm and at 1.2 mW cm-2. Herein, the capacitance of the sensor applied to the two-electrode structure was determined, along with the light sensitivity and change in noise with frequency. We believe that the proposed multi-sensor can be applied in a wide range of fields because it can act as a touch sensor and light sensor.
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Affiliation(s)
- Kwang Wook Choi
- Display and Nanosystem Laboratory, Department of Electrical Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Cheol Shin
- Display and Nanosystem Laboratory, Department of Electrical Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
- Samsung Display Co., Samsung Street 181, Tangjeong-Myeon, Asan-si, Chungcheongnam-do 31460, Republic of Korea
| | - Sungwoo Jun
- Display and Nanosystem Laboratory, Department of Electrical Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Soo Jong Park
- Display and Nanosystem Laboratory, Department of Electrical Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Yooji Hwang
- Display and Nanosystem Laboratory, Department of Electrical Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Jin Ho Kwak
- Display and Nanosystem Laboratory, Department of Electrical Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
- Samsung Display Co., Samsung Street 181, Tangjeong-Myeon, Asan-si, Chungcheongnam-do 31460, Republic of Korea
| | - Young Wook Park
- Department of Display and Semiconductor Engineering, SUN MOON University Asan Campus, 70 221-beongil, Sunmoon-ro, Tangjeong-myeon, Asan-si, Chungcheongnam-do 31460, Republic of Korea
| | - Jong-Woong Kim
- School of Advanced Materials Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju, 54896, Republic of Korea
| | - Byeong-Kwon Ju
- Display and Nanosystem Laboratory, Department of Electrical Engineering, Korea University, 145, Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
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Infrared photoconduction at the diffusion length limit in HgTe nanocrystal arrays. Nat Commun 2021; 12:1794. [PMID: 33741921 PMCID: PMC7979921 DOI: 10.1038/s41467-021-21959-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 02/20/2021] [Indexed: 12/02/2022] Open
Abstract
Narrow band gap nanocrystals offer an interesting platform for alternative design of low-cost infrared sensors. It has been demonstrated that transport in HgTe nanocrystal arrays occurs between strongly-coupled islands of nanocrystals in which charges are partly delocalized. This, combined with the scaling of the noise with the active volume of the film, make case for device size reduction. Here, with two steps of optical lithography we design a nanotrench which effective channel length corresponds to 5–10 nanocrystals, matching the carrier diffusion length. We demonstrate responsivity as high as 1 kA W−1, which is 105 times higher than for conventional µm-scale channel length. In this work the associated specific detectivity exceeds 1012 Jones for 2.5 µm peak detection under 1 V at 200 K and 1 kHz, while the time response is as short as 20 µs, making this performance the highest reported for HgTe NC-based extended short-wave infrared detection. Infrared nanocrystals have become an enabling building block for the design of low-cost infrared sensors. Here, Chu et al. design a nanotrench device geometry at the diffusion length limit in HgTe nanocrystals and demonstrate the record high sensing performance operated in the short-wave infrared.
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Gréboval C, Chu A, Goubet N, Livache C, Ithurria S, Lhuillier E. Mercury Chalcogenide Quantum Dots: Material Perspective for Device Integration. Chem Rev 2021; 121:3627-3700. [DOI: 10.1021/acs.chemrev.0c01120] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Charlie Gréboval
- CNRS, Institut des NanoSciences de Paris, INSP, Sorbonne Université, F-75005 Paris, France
| | - Audrey Chu
- CNRS, Institut des NanoSciences de Paris, INSP, Sorbonne Université, F-75005 Paris, France
| | - Nicolas Goubet
- CNRS, Laboratoire de la Molécule aux Nano-objets; Réactivité, Interactions et Spectroscopies, MONARIS, Sorbonne Université, 4 Place Jussieu, Case Courier 840, F-75005 Paris, France
| | - Clément Livache
- CNRS, Institut des NanoSciences de Paris, INSP, Sorbonne Université, F-75005 Paris, France
| | - Sandrine Ithurria
- Laboratoire de Physique et d’Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université Univ Paris 06, CNRS UMR 8213, 10 rue Vauquelin 75005 Paris, France
| | - Emmanuel Lhuillier
- CNRS, Institut des NanoSciences de Paris, INSP, Sorbonne Université, F-75005 Paris, France
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10
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Zhang Z, Thung YT, Chen X, Wang L, Fan W, Ding L, Sun H. Study of Complex Optical Constants of Neat Cadmium Selenide Nanoplatelets Thin Films by Spectroscopic Ellipsometry. J Phys Chem Lett 2021; 12:191-198. [PMID: 33325711 DOI: 10.1021/acs.jpclett.0c03304] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Knowledge of tunability of complex optical constants of colloidal CdSe nanoplatelets (NPLs) thin films is essential for accurate modeling and design of NPL-containing optoelectronic devices. Here, dielectric functions, complex optical conductivities, and absorption coefficients of a series of CdSe NPL films with a varying number of atomic layers were investigated in a combination of spectroscopic ellipsometry techniques and transmittance measurements over a broad spectral range. Fine electronic structures were deciphered from the dielectric functions. Oscillator strengths at the lowest exciton resonance up to 0.62 for a series of CdSe NPL films were also determined. From our results, increasing the number of monolayers was found to boost the complex optical constants and the amplitude of the coupling strength of the fundamental exciton state mainly due to higher inorganic volume filling factors and pronounced surface passivation. Our work gives insights into both the interpretation and improvements of performance of CdSe NPL-based photoelectronic applications.
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Affiliation(s)
- Zitong Zhang
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Yi Tian Thung
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Xiaoxuan Chen
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
| | - Lin Wang
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
- Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, 149 Yanchang Road, Shanghai 200072, China
| | - Weijun Fan
- School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
| | - Lu Ding
- A*STAR (Agency for Science, Technology and Research), Institute of Materials Research and Engineering, Singapore 138634, Singapore
| | - Handong Sun
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
- Centre for Disruptive Photonic Technologies (CDPT), School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
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11
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Pokhriyal S, Biswas S. Photoresponse of CdSe-PVA nanocomposite films at low magnetic fields. NANOTECHNOLOGY 2020; 31:495205. [PMID: 32990266 DOI: 10.1088/1361-6528/abb0b7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A set of nanocomposite films of poly-vinyl alcohol (PVA) and 0.1-0.4 wt% CdSe nanoparticles (NPs) were developed by spin coating and their surface resistance (R) was measured as a function of light illumination intensity (IL ) and applied magnetic field (H). The ferromagnetic CdSe NPs were synthesized by a facile chemical method which ensured in situ surface stabilization with a skinny layer of graphitic carbon. The CdSe NPs were uniformly dispersed in an aqueous solution of 2.0 wt% PVA and spin-coated on fluorine-doped tin oxide coated glass substrates. The photoresponse of the nanocomposite films at low H exhibits their efficacy for pertinent applications in optoelectronics.
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Affiliation(s)
- S Pokhriyal
- Department of Physics, Poornima University, Jaipur 303905, India
- Department of Physics, The LNM Institute of Information Technology, Jaipur 302031, India
| | - S Biswas
- Department of Physics, The LNM Institute of Information Technology, Jaipur 302031, India
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12
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Piveteau L, Dirin DN, Gordon CP, Walder BJ, Ong TC, Emsley L, Copéret C, Kovalenko MV. Colloidal-ALD-Grown Core/Shell CdSe/CdS Nanoplatelets as Seen by DNP Enhanced PASS-PIETA NMR Spectroscopy. NANO LETTERS 2020; 20:3003-3018. [PMID: 32078332 PMCID: PMC7227022 DOI: 10.1021/acs.nanolett.9b04870] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Ligand exchange and CdS shell growth onto colloidal CdSe nanoplatelets (NPLs) using colloidal atomic layer deposition (c-ALD) were investigated by solid-state nuclear magnetic resonance (NMR) experiments, in particular, dynamic nuclear polarization (DNP) enhanced phase adjusted spinning sidebands-phase incremented echo-train acquisition (PASS-PIETA). The improved sensitivity and resolution of DNP enhanced PASS-PIETA permits the identification and study of the core, shell, and surface species of CdSe and CdSe/CdS core/shell NPLs heterostructures at all stages of c-ALD. The cadmium chemical shielding was found to be proportionally dependent on the number and nature of coordinating chalcogen-based ligands. DFT calculations permitted the separation of the the 111/113Cd chemical shielding into its different components, revealing that the varying strength of paramagnetic and spin-orbit shielding contributions are responsible for the chemical shielding trend of cadmium chalcogenides. Overall, this study points to the roughening and increased chemical disorder at the surface during the shell growth process, which is not readily captured by the conventional characterization tools such as electron microscopy.
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Affiliation(s)
- Laura Piveteau
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, Zurich CH-8093, Switzerland
- Empa-Swiss
Federal Laboratories for Materials Science and Technology, Dübendorf, Überlandstrasse
129, Zurich CH-8600, Switzerland
| | - Dmitry N. Dirin
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, Zurich CH-8093, Switzerland
- Empa-Swiss
Federal Laboratories for Materials Science and Technology, Dübendorf, Überlandstrasse
129, Zurich CH-8600, Switzerland
| | - Christopher P. Gordon
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, Zurich CH-8093, Switzerland
| | - Brennan J. Walder
- Institut
des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Ta-Chung Ong
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, Zurich CH-8093, Switzerland
| | - Lyndon Emsley
- Institut
des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland
| | - Christophe Copéret
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, Zurich CH-8093, Switzerland
- E-mail:
| | - Maksym V. Kovalenko
- Department
of Chemistry and Applied Biosciences, ETH
Zürich, Vladimir Prelog Weg 1-5, Zurich CH-8093, Switzerland
- Empa-Swiss
Federal Laboratories for Materials Science and Technology, Dübendorf, Überlandstrasse
129, Zurich CH-8600, Switzerland
- E-mail:
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13
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Dufour M, Qu J, Greboval C, Méthivier C, Lhuillier E, Ithurria S. Halide Ligands To Release Strain in Cadmium Chalcogenide Nanoplatelets and Achieve High Brightness. ACS NANO 2019; 13:5326-5334. [PMID: 30974938 DOI: 10.1021/acsnano.8b09794] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Zinc blende II-VI semiconductor nanoplatelets (NPLs) are defined at the atomic scale along the thickness of the nanoparticle and are initially capped with carboxylates on the top and bottom [001] facets. These ligands are exchanged on CdSe NPLs with halides that act as X-L-type ligands. These CdSe NPLs are costabilized by amines to provide colloidal stability in nonpolar solvents. The hydrogen from the amine can participate in a hydrogen bond with the lone pair electrons of surface halides. After ligand exchange, the optical features are red-shifted. Thus, ligand tuning is another way, in addition to confinement, to tune the optical features of NPLs. The improved surface passivation leads to an increase in the fluorescence quantum efficiency of up to 70% in the case of bromide. However, for chloride and iodide, the surface coverage is incomplete, and thus, the fluorescence quantum efficiency is lower. This ligand exchange is associated with a decrease in stress that leads to unfolding of the NPLs, which is particularly noticeable for iodide-capped NPLs.
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Affiliation(s)
- Marion Dufour
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université UPMC, Univ Paris 06, CNRS, 10 rue Vauquelin , 75005 Paris , France
| | - Junling Qu
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris , France
| | - Charlie Greboval
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris , France
| | - Christophe Méthivier
- Laboratoire de Réactivité de Surface (LRS, UMR 7197), Sorbonne Université, CNRS, 4 place Jussieu , F-75005 Paris , France
| | - Emmanuel Lhuillier
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris , France
| | - Sandrine Ithurria
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-Paris, PSL Research University, Sorbonne Université UPMC, Univ Paris 06, CNRS, 10 rue Vauquelin , 75005 Paris , France
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14
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Dufour M, Izquierdo E, Livache C, Martinez B, Silly MG, Pons T, Lhuillier E, Delerue C, Ithurria S. Doping as a Strategy to Tune Color of 2D Colloidal Nanoplatelets. ACS APPLIED MATERIALS & INTERFACES 2019; 11:10128-10134. [PMID: 30777752 DOI: 10.1021/acsami.8b18650] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Among colloidal nanocrystals, 2D nanoplatelets (NPLs) made of II-VI compounds appear as a special class of emitters with an especially narrow photoluminescence signal. However, the PL signal in the case of NPLs is only tunable by a discrete step. Here, we demonstrate that doping is a viable path to finely tune the color of these NPLs from green to red, making them extremely interesting as phosphors for wide-gamut display. In addition, using a combination of luminescence spectroscopy, tight-binding simulation, transport, and photoemission, we provide a consistent picture for the Ag+-doped CdSe NPLs. The Ag-activated state is strongly bound and located 340 meV above the valence band of the bulk material. The Ag dopant induces a relative shift of the Fermi level toward the valence band by up to 400 meV but preserves the n-type nature of the material.
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Affiliation(s)
- Marion Dufour
- Laboratoire de Physique et d'Etude des Matériaux , ESPCI-Paris, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS , 10 rue Vauquelin , 75005 Paris , France
| | - Eva Izquierdo
- Laboratoire de Physique et d'Etude des Matériaux , ESPCI-Paris, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS , 10 rue Vauquelin , 75005 Paris , France
| | - Clément Livache
- Laboratoire de Physique et d'Etude des Matériaux , ESPCI-Paris, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS , 10 rue Vauquelin , 75005 Paris , France
- Sorbonne Université, CNRS, Institut des nanosciences de Paris, INSP , F-75005 Paris , France
| | - Bertille Martinez
- Laboratoire de Physique et d'Etude des Matériaux , ESPCI-Paris, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS , 10 rue Vauquelin , 75005 Paris , France
- Sorbonne Université, CNRS, Institut des nanosciences de Paris, INSP , F-75005 Paris , France
| | - Mathieu G Silly
- Synchrotron-SOLEIL , Saint-Aubin, BP48, F91192 Gif-sur-Yvette , France
| | - Thomas Pons
- Laboratoire de Physique et d'Etude des Matériaux , ESPCI-Paris, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS , 10 rue Vauquelin , 75005 Paris , France
| | - Emmanuel Lhuillier
- Sorbonne Université, CNRS, Institut des nanosciences de Paris, INSP , F-75005 Paris , France
| | - Christophe Delerue
- Université de Lille, CNRS, Centrale Lille, ISEN, Université de Valenciennes, UMR 8520-IEMN , 59000 Lille , France
| | - Sandrine Ithurria
- Laboratoire de Physique et d'Etude des Matériaux , ESPCI-Paris, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS , 10 rue Vauquelin , 75005 Paris , France
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15
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Gréboval C, Izquierdo E, Livache C, Martinez B, Dufour M, Goubet N, Moghaddam N, Qu J, Chu A, Ramade J, Aubin H, Cruguel H, Silly M, Lhuillier E, Ithurria S. Impact of dimensionality and confinement on the electronic properties of mercury chalcogenide nanocrystals. NANOSCALE 2019; 11:3905-3915. [PMID: 30758021 DOI: 10.1039/c8nr09644a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We demonstrate the growth of 2D nanoplatelets (NPLs) made of a HgTe/CdS heterostructure, with an optical absorption reaching the shortwave infrared range. The material is an interesting platform to investigate the effect of dimensionality (0D vs. 2D) and confinement on the electronic spectrum and carrier dynamics in colloidal materials. We bring consistent evidence for the p-type nature of this material from transport and photoemission measurements. The majority carrier dynamics probed using pump-probe photoemission is found to be mostly dependent on the presence of a confinement barrier at the surface rather than on the material dimensionality. The minority carrier, on the other hand, is strongly affected by the material shape showing a longer lived minority carrier in 2D NPLs compared to their 0D equivalent with a similar band gap. Finally, we test the potential of this material for photodetection in the short-wave infrared range (SWIR) and show that fast photoresponse and detectivity reaching 109 Jones at room temperature can be achieved.
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Affiliation(s)
- Charlie Gréboval
- Sorbonne Université, CNRS, Institut des NanoSciences de Paris, INSP, F-75005 Paris, France.
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16
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Jun S, Choi SB, Han CJ, Yu YT, Lee CR, Ju BK, Kim JW. Fabrication and Characterization of a Capacitive Photodetector Comprising a ZnS/Cu Particle/Poly(vinyl butyral) Composite. ACS APPLIED MATERIALS & INTERFACES 2019; 11:4416-4424. [PMID: 30644712 DOI: 10.1021/acsami.8b20136] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Most photodetectors developed to date essentially measure photocurrents induced by the generation and separation of electron-hole pairs in semiconductors during irradiation. Although the above light detection method is well established, highly sensitive, and applicable to a broad range of semiconductor materials, it requires the presence of a stable and direct contact between the semiconductor and the electrode for accurate photocurrent measurements. In turn, this prerequisite necessitates the use of various costly processes for device fabrication (e.g., photolithography and vacuum deposition of semiconductors/metals) and complicates the development of flexible devices. Herein, inspired by the fact that the dielectric properties of certain materials can be changed by light irradiation, we dispersed ZnS/Cu semiconducting particles in poly(vinyl butyral) to prepare a free-standing composite film and formed two layers of Ag nanowire electrodes on both sides of the cured composite to fabricate a photodetector of a completely new type. The developed device exhibited a capacitance very sensitive to irradiation with light of a specific wavelength and additionally featured the advantages of simple structure/operation mechanism, mechanical flexibility, and transparency, not showing any signs of performance deterioration even after severe damage.
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Affiliation(s)
- Sungwoo Jun
- Display Materials & Components Research Center , Korea Electronics Technology Institute , Seongnam 463-816 , Republic of Korea
- Display and Nanosystem Laboratory, College of Engineering , Korea University , Seoul 136-713 , Republic of Korea
| | - Su Bin Choi
- School of Advanced Materials Engineering , Chonbuk National University , 567 Baekje-daero , Deokjin-gu, Jeonju 54896 , Republic of Korea
| | - Chul Jong Han
- Display Materials & Components Research Center , Korea Electronics Technology Institute , Seongnam 463-816 , Republic of Korea
| | - Yeon-Tae Yu
- School of Advanced Materials Engineering , Chonbuk National University , 567 Baekje-daero , Deokjin-gu, Jeonju 54896 , Republic of Korea
| | - Cheul-Ro Lee
- School of Advanced Materials Engineering , Chonbuk National University , 567 Baekje-daero , Deokjin-gu, Jeonju 54896 , Republic of Korea
| | - Byeong-Kwon Ju
- Display and Nanosystem Laboratory, College of Engineering , Korea University , Seoul 136-713 , Republic of Korea
| | - Jong-Woong Kim
- School of Advanced Materials Engineering , Chonbuk National University , 567 Baekje-daero , Deokjin-gu, Jeonju 54896 , Republic of Korea
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17
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Giovanella U, Pasini M, Lorenzon M, Galeotti F, Lucchi C, Meinardi F, Luzzati S, Dubertret B, Brovelli S. Efficient Solution-Processed Nanoplatelet-Based Light-Emitting Diodes with High Operational Stability in Air. NANO LETTERS 2018; 18:3441-3448. [PMID: 29722262 DOI: 10.1021/acs.nanolett.8b00456] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Colloidal nanoplatelets (NPLs), owing to their efficient and narrow-band luminescence, are considered as promising candidates for solution-processable light-emitting diodes (LEDs) with ultrahigh color purity. To date, however, the record efficiencies of NPL-LEDs are significantly lower than those of more-investigated devices based on spherical nanocrystals. This is particularly true for red-emitting NPL-LEDs, the best-reported external quantum efficiency (EQE) of which is limited to 0.63% (EQE = 5% for green NPL-LEDs). Here, we address this issue by introducing a charge-regulating layer of a polar and polyelectrolytic polymer specifically engineered with complementary trimethylammonium and phosphonate functionalities that provide high solubility in orthogonal polar media with respect to the NPL active layer, compatibility with the metal cathode, and the ability to control electron injection through the formation of a polarized interface under bias. Through this synergic approach, we achieve EQE = 5.73% at 658 nm (color saturation 98%) in completely solution processed LEDs. Remarkably, exposure to air increases the EQE to 8.39%, exceeding the best reports of red NPL-LEDs by over 1 order of magnitude and setting a new global record for quantum-dot LEDs of any color embedding solution-deposited organic interlayers. Considering the emission quantum yield of the NPLs (40 ± 5%), this value corresponds to a near-unity internal quantum efficiency. Notably, our devices show exceptional operational stability for over 5 h of continuous drive in air with no encapsulation, thus confirming the potential of NPLs for efficient, high-stability, saturated LEDs.
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Affiliation(s)
- Umberto Giovanella
- Istituto per lo Studio delle Macromolecole , Consiglio Nazionale delle Ricerche (ISMac-CNR) , Via Bassini 15 , 20133 Milano , Italy
| | - Mariacecilia Pasini
- Istituto per lo Studio delle Macromolecole , Consiglio Nazionale delle Ricerche (ISMac-CNR) , Via Bassini 15 , 20133 Milano , Italy
| | - Monica Lorenzon
- Dipartimento di Scienza dei Materiali , Università degli Studi di Milano-Bicocca , via Cozzi 55 , I-20125 Milano , Italy
| | - Francesco Galeotti
- Istituto per lo Studio delle Macromolecole , Consiglio Nazionale delle Ricerche (ISMac-CNR) , Via Bassini 15 , 20133 Milano , Italy
| | - Claudio Lucchi
- Dipartimento di Scienza dei Materiali , Università degli Studi di Milano-Bicocca , via Cozzi 55 , I-20125 Milano , Italy
| | - Francesco Meinardi
- Dipartimento di Scienza dei Materiali , Università degli Studi di Milano-Bicocca , via Cozzi 55 , I-20125 Milano , Italy
| | - Silvia Luzzati
- Istituto per lo Studio delle Macromolecole , Consiglio Nazionale delle Ricerche (ISMac-CNR) , Via Bassini 15 , 20133 Milano , Italy
| | - Benoit Dubertret
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-ParisTech , PSL Research University, Sorbonne Université UPMC Université Paris 06, CNRS , 10 rue Vauquelin , 75005 Paris , France
| | - Sergio Brovelli
- Dipartimento di Scienza dei Materiali , Università degli Studi di Milano-Bicocca , via Cozzi 55 , I-20125 Milano , Italy
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18
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Lazareva EP, Kozlovskii VF, Vasiliev RB, Gaskov AM. Tin Domain Growth on Quasi-Two-Dimensional CdTe and CdSe Nanoparticles. RUSS J INORG CHEM+ 2018. [DOI: 10.1134/s0036023618050133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Muckel F, Delikanli S, Hernández-Martínez PL, Priesner T, Lorenz S, Ackermann J, Sharma M, Demir HV, Bacher G. sp-d Exchange Interactions in Wave Function Engineered Colloidal CdSe/Mn:CdS Hetero-Nanoplatelets. NANO LETTERS 2018; 18:2047-2053. [PMID: 29464958 DOI: 10.1021/acs.nanolett.8b00060] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In two-dimensional (2D) colloidal semiconductor nanoplatelets, which are atomically flat nanocrystals, the precise control of thickness and composition on the atomic scale allows for the synthesis of heterostructures with well-defined electron and hole wave function distributions. Introducing transition metal dopants with a monolayer precision enables tailored magnetic exchange interactions between dopants and band states. Here, we use the absorption based technique of magnetic circular dichroism (MCD) to directly prove the exchange coupling of magnetic dopants with the band charge carriers in hetero-nanoplatelets with CdSe core and manganese-doped CdS shell (CdSe/Mn:CdS). We show that the strength of both the electron as well as the hole exchange interactions with the dopants can be tuned by varying the nanoplatelets architecture with monolayer accuracy. As MCD is highly sensitive for excitonic resonances, excited level spectroscopy allows us to resolve and identify, in combination with wave function calculations, several excited state transitions including spin-orbit split-off excitonic contributions. Thus, our study not only demonstrates the possibility to expand the extraordinary physical properties of colloidal nanoplatelets toward magneto-optical functionality by transition metal doping but also provides an insight into the excited state electronic structure in this novel two-dimensional material.
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Affiliation(s)
- Franziska Muckel
- Werkstoffe der Elektrotechnik and CENIDE , University Duisburg-Essen , Bismarckstraße 81 , 47057 Duisburg , Germany
| | - Savas Delikanli
- LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Materials Sciences, School of Materials Sciences and Engineering , Nanyang Technological University 639798 , Singapore
| | - Pedro Ludwig Hernández-Martínez
- LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Materials Sciences, School of Materials Sciences and Engineering , Nanyang Technological University 639798 , Singapore
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology , Bilkent University , Ankara 06800 , Turkey
| | - Tamara Priesner
- Werkstoffe der Elektrotechnik and CENIDE , University Duisburg-Essen , Bismarckstraße 81 , 47057 Duisburg , Germany
| | - Severin Lorenz
- Werkstoffe der Elektrotechnik and CENIDE , University Duisburg-Essen , Bismarckstraße 81 , 47057 Duisburg , Germany
| | - Julia Ackermann
- Werkstoffe der Elektrotechnik and CENIDE , University Duisburg-Essen , Bismarckstraße 81 , 47057 Duisburg , Germany
| | - Manoj Sharma
- LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Materials Sciences, School of Materials Sciences and Engineering , Nanyang Technological University 639798 , Singapore
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology , Bilkent University , Ankara 06800 , Turkey
| | - Hilmi Volkan Demir
- LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays, School of Electrical and Electronic Engineering, School of Physical and Materials Sciences, School of Materials Sciences and Engineering , Nanyang Technological University 639798 , Singapore
- Department of Electrical and Electronics Engineering, Department of Physics, UNAM - Institute of Materials Science and Nanotechnology , Bilkent University , Ankara 06800 , Turkey
| | - Gerd Bacher
- Werkstoffe der Elektrotechnik and CENIDE , University Duisburg-Essen , Bismarckstraße 81 , 47057 Duisburg , Germany
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20
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Kormilina TK, Cherevkov SA, Fedorov AV, Baranov AV. Cadmium Chalcogenide Nano-Heteroplatelets: Creating Advanced Nanostructured Materials by Shell Growth, Substitution, and Attachment. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2017; 13:1702300. [PMID: 28895307 DOI: 10.1002/smll.201702300] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 07/24/2017] [Indexed: 06/07/2023]
Abstract
The current direction in the evolution of 2D semiconductor nanocrystals involves the combination of metal and semiconductor components to form new nanoengineered materials called nano-heteroplatelets. This Review covers different heterostructure architectures that can be applied to cadmium chalcogenide nanoplatelets, including variously shaped shell, metal nanoparticle decoration, and doped and alloy systems. Here, for the first time a complete classification of nano-heteroplatelet types is provided with recommended notations and a systematization of the existing knowledge and experience concerning heterostructure formation techniques, addressing the morphology, optoelectronic and magnetic properties, and novel features of different heterostructures. This Review is also devoted to possible applications of these heterostructures and of one-component nanoplatelets in multiple fields, including light-emitting devices and biological imaging.
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Affiliation(s)
- Tatiana K Kormilina
- Department of Optical Physics and Modern Natural Science, ITMO University, 49 Kronverksky Pr, St. Petersburg, 197101, Russia
| | - Sergei A Cherevkov
- Department of Optical Physics and Modern Natural Science, ITMO University, 49 Kronverksky Pr, St. Petersburg, 197101, Russia
| | - Anatoly V Fedorov
- Department of Optical Physics and Modern Natural Science, ITMO University, 49 Kronverksky Pr, St. Petersburg, 197101, Russia
| | - Alexander V Baranov
- Department of Optical Physics and Modern Natural Science, ITMO University, 49 Kronverksky Pr, St. Petersburg, 197101, Russia
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21
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Martinez B, Livache C, Notemgnou Mouafo LD, Goubet N, Keuleyan S, Cruguel H, Ithurria S, Aubin H, Ouerghi A, Doudin B, Lacaze E, Dubertret B, Silly MG, Lobo RPSM, Dayen JF, Lhuillier E. HgSe Self-Doped Nanocrystals as a Platform to Investigate the Effects of Vanishing Confinement. ACS APPLIED MATERIALS & INTERFACES 2017; 9:36173-36180. [PMID: 28956432 DOI: 10.1021/acsami.7b10665] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Self-doped colloidal quantum dots (CQDs) attract a strong interest for the design of a new generation of low-cost infrared (IR) optoelectronic devices because of their tunable intraband absorption feature in the mid-IR region. However, very little remains known about their electronic structure which combines confinement and an inverted band structure, complicating the design of optimized devices. We use a combination of IR spectroscopy and photoemission to determine the absolute energy levels of HgSe CQDs with various sizes and surface chemistries. We demonstrate that the filling of the CQD states ranges from 2 electrons per CQD at small sizes (<5 nm) to more than 18 electrons per CQD at large sizes (≈20 nm). HgSe CQDs are also an interesting platform to observe vanishing confinement in colloidal nanoparticles. We present lines of evidence for a semiconductor-to-metal transition at the CQD level, through temperature-dependent absorption and transport measurements. In contrast with bulk systems, the transition is the result of the vanishing confinement rather than the increase of the doping level.
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Affiliation(s)
- Bertille Martinez
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris , 4 Place Jussieu, 75005 Paris, France
- LPEM, ESPCI Paris, PSL Research University , 10 rue Vauquelin, 75005 Paris, France
| | - Clément Livache
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris , 4 Place Jussieu, 75005 Paris, France
- LPEM, ESPCI Paris, PSL Research University , 10 rue Vauquelin, 75005 Paris, France
| | | | - Nicolas Goubet
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris , 4 Place Jussieu, 75005 Paris, France
- LPEM, ESPCI Paris, PSL Research University , 10 rue Vauquelin, 75005 Paris, France
| | - Sean Keuleyan
- Voxtel, Inc., University of Oregon, CAMCOR, 1241 University of Oregon , Eugene, Oregon 97403, United States
| | - Hervé Cruguel
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris , 4 Place Jussieu, 75005 Paris, France
| | - Sandrine Ithurria
- LPEM, ESPCI Paris, PSL Research University , 10 rue Vauquelin, 75005 Paris, France
- Sorbonne Universités, UPMC Univ Paris 06, LPEM , 75005 Paris, France
| | - Hervé Aubin
- LPEM, ESPCI Paris, PSL Research University , 10 rue Vauquelin, 75005 Paris, France
- Sorbonne Universités, UPMC Univ Paris 06, LPEM , 75005 Paris, France
| | - Abdelkarim Ouerghi
- Centre de Nanosciences et de Nanotechnologies, CNRS, Univ. Paris-Sud, Université Paris-Saclay, C2N-Marcoussis , 91460 Marcoussis, France
| | - Bernard Doudin
- Université de Strasbourg, IPCMS-CNRS UMR 7504 , 23 Rue du Loess, 67034 Strasbourg, France
| | - Emmanuelle Lacaze
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris , 4 Place Jussieu, 75005 Paris, France
| | - Benoit Dubertret
- LPEM, ESPCI Paris, PSL Research University , 10 rue Vauquelin, 75005 Paris, France
- Sorbonne Universités, UPMC Univ Paris 06, LPEM , 75005 Paris, France
| | - Mathieu G Silly
- Synchrotron-SOLEIL , Saint-Aubin, BP48, F91192 Gif sur Yvette Cedex, France
| | - Ricardo P S M Lobo
- LPEM, ESPCI Paris, PSL Research University , 10 rue Vauquelin, 75005 Paris, France
- Sorbonne Universités, UPMC Univ Paris 06, LPEM , 75005 Paris, France
| | - Jean-François Dayen
- Université de Strasbourg, IPCMS-CNRS UMR 7504 , 23 Rue du Loess, 67034 Strasbourg, France
| | - Emmanuel Lhuillier
- Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris , 4 Place Jussieu, 75005 Paris, France
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22
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Livache C, Izquierdo E, Martinez B, Dufour M, Pierucci D, Keuleyan S, Cruguel H, Becerra L, Fave JL, Aubin H, Ouerghi A, Lacaze E, Silly MG, Dubertret B, Ithurria S, Lhuillier E. Charge Dynamics and Optolectronic Properties in HgTe Colloidal Quantum Wells. NANO LETTERS 2017; 17:4067-4074. [PMID: 28598629 DOI: 10.1021/acs.nanolett.7b00683] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We investigate the electronic and transport properties of HgTe 2D colloidal quantum wells. We demonstrate that the material can be made p- or n-type depending on the capping ligands. In addition to the control of majority carrier type, the surface chemistry also strongly affects the photoconductivity of the material. These transport measurements are correlated with the electronic structure determined by high resolution X-ray photoemission. We attribute the change of majority carriers to the strong hybridization of an n-doped HgS layer resulting from capping the HgTe nanoplatelets by S2- ions. We further investigate the gate and temperature dependence of the photoresponse and its dynamics. We show that the photocurrent rise and fall times can be tuned from 100 μs to 1 ms using the gate bias. Finally, we use time-resolved photoemission spectroscopy as a probe of the transport relaxation to determine if the observed dynamics are limited by a fundamental process such as trapping. These pump probe surface photovoltage measurements show an even faster relaxation in the 100-500 ns range, which suggests that the current performances are rather limited by geometrical factors.
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Affiliation(s)
- Clément Livache
- Institut des NanoSciences de Paris, Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588 , 4 place Jussieu, 75005 Paris, France
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-ParisTech, PSL Research University, Sorbonne Université UPMC Univ. Paris 06, CNRS , 10 rue Vauquelin 75005 Paris, France
| | - Eva Izquierdo
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-ParisTech, PSL Research University, Sorbonne Université UPMC Univ. Paris 06, CNRS , 10 rue Vauquelin 75005 Paris, France
| | - Bertille Martinez
- Institut des NanoSciences de Paris, Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588 , 4 place Jussieu, 75005 Paris, France
| | - Marion Dufour
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-ParisTech, PSL Research University, Sorbonne Université UPMC Univ. Paris 06, CNRS , 10 rue Vauquelin 75005 Paris, France
| | - Debora Pierucci
- Institut Néel, CNRS-UJF , BP 166, 38042 Grenoble Cedex 9, France
| | - Sean Keuleyan
- Voxtel, Inc., University of Oregon, CAMCOR, 1241 University of Oregon , Eugene, Oregon 97403, United States
| | - Hervé Cruguel
- Institut des NanoSciences de Paris, Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588 , 4 place Jussieu, 75005 Paris, France
| | - Loic Becerra
- Institut des NanoSciences de Paris, Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588 , 4 place Jussieu, 75005 Paris, France
| | - Jean Louis Fave
- Institut des NanoSciences de Paris, Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588 , 4 place Jussieu, 75005 Paris, France
| | - Hervé Aubin
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-ParisTech, PSL Research University, Sorbonne Université UPMC Univ. Paris 06, CNRS , 10 rue Vauquelin 75005 Paris, France
| | - Abdelkarim Ouerghi
- Laboratoire de Photonique et de Nanostructures (CNRS-LPN), Route de Nozay, 91460 Marcoussis, France
| | - Emmanuelle Lacaze
- Institut des NanoSciences de Paris, Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588 , 4 place Jussieu, 75005 Paris, France
| | - Mathieu G Silly
- Synchrotron-SOLEIL, Saint-Aubin, BP48, F91192 Gif sur Yvette Cedex, France
| | - Benoit Dubertret
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-ParisTech, PSL Research University, Sorbonne Université UPMC Univ. Paris 06, CNRS , 10 rue Vauquelin 75005 Paris, France
| | - Sandrine Ithurria
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-ParisTech, PSL Research University, Sorbonne Université UPMC Univ. Paris 06, CNRS , 10 rue Vauquelin 75005 Paris, France
| | - Emmanuel Lhuillier
- Institut des NanoSciences de Paris, Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588 , 4 place Jussieu, 75005 Paris, France
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23
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Wang H, Lhuillier E, Yu Q, Zimmers A, Dubertret B, Ulysse C, Aubin H. Transport in a Single Self-Doped Nanocrystal. ACS NANO 2017; 11:1222-1229. [PMID: 28045500 DOI: 10.1021/acsnano.6b07898] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Addressing the optical properties of a single nanoparticle in the infrared is particularly challenging, thus alternative methods for characterizing the conductance spectrum of nanoparticles in this spectral range need to be developed. Here we describe an efficient method of fabricating single nanoparticle tunnel junctions on a chip circuit. We apply this method to narrow band gap nanoparticles of HgSe, which band structure combines the inverted character of the bulk semimetal with quantum confinement and self-doping. Upon tuning the gate bias, measurement reveals the presence of two energy gaps in the spectrum. The wider gap results from the interband gap, while the narrower gap results from intraband transitions. The observation of the latter near zero gate voltage confirms the doped character of the nanoparticle at the single particle level, which is in full agreement with the ensemble optical and transport measurements. Finally we probe the phototransport within a single quantum dot and demonstrate a large photogain mechanism resulting from photogating.
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Affiliation(s)
- Hongyue Wang
- ESPCI-ParisTech, PSL Research University, UPMC Université Paris 06, LPEM, CNRS , 10 rue Vauquelin, Paris Cedex 5 F-75231, France
| | - Emmanuel Lhuillier
- Sorbonne Universités, UPMC Université Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris , Paris F-75005, France
| | - Qian Yu
- ESPCI-ParisTech, PSL Research University, UPMC Université Paris 06, LPEM, CNRS , 10 rue Vauquelin, Paris Cedex 5 F-75231, France
| | - Alexandre Zimmers
- ESPCI-ParisTech, PSL Research University, UPMC Université Paris 06, LPEM, CNRS , 10 rue Vauquelin, Paris Cedex 5 F-75231, France
| | - Benoit Dubertret
- ESPCI-ParisTech, PSL Research University, UPMC Université Paris 06, LPEM, CNRS , 10 rue Vauquelin, Paris Cedex 5 F-75231, France
| | - Christian Ulysse
- Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Sud, Université Paris-Saclay , C2N - Marcoussis, Marcoussis 91460, France
| | - Hervé Aubin
- ESPCI-ParisTech, PSL Research University, UPMC Université Paris 06, LPEM, CNRS , 10 rue Vauquelin, Paris Cedex 5 F-75231, France
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24
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Nasilowski M, Mahler B, Lhuillier E, Ithurria S, Dubertret B. Two-Dimensional Colloidal Nanocrystals. Chem Rev 2016; 116:10934-82. [DOI: 10.1021/acs.chemrev.6b00164] [Citation(s) in RCA: 341] [Impact Index Per Article: 42.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Michel Nasilowski
- Laboratoire de
Physique et d’Étude des Matériaux, PSL Research
University, CNRS UMR 8213, Sorbonne Universités UPMC Université
Paris 06, ESPCI Paris, 10 rue Vauquelin, 75005 Paris, France
| | - Benoit Mahler
- Institut
Lumière-Matière, CNRS UMR5306, Université Lyon
1, Université de Lyon, 69622 Villeurbanne
CEDEX, France
| | - Emmanuel Lhuillier
- Sorbonne Universités,
UPMC Université Paris 06, CNRS-UMR 7588, Institut des NanoSciences
de Paris, F-75005 Paris, France
| | - Sandrine Ithurria
- Laboratoire de
Physique et d’Étude des Matériaux, PSL Research
University, CNRS UMR 8213, Sorbonne Universités UPMC Université
Paris 06, ESPCI Paris, 10 rue Vauquelin, 75005 Paris, France
| | - Benoit Dubertret
- Laboratoire de
Physique et d’Étude des Matériaux, PSL Research
University, CNRS UMR 8213, Sorbonne Universités UPMC Université
Paris 06, ESPCI Paris, 10 rue Vauquelin, 75005 Paris, France
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25
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Engineering the Charge Transfer in all 2D Graphene-Nanoplatelets Heterostructure Photodetectors. Sci Rep 2016; 6:24909. [PMID: 27143413 PMCID: PMC4855231 DOI: 10.1038/srep24909] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Accepted: 04/06/2016] [Indexed: 11/09/2022] Open
Abstract
Two dimensional layered (i.e. van der Waals) heterostructures open up great prospects, especially in photodetector applications. In this context, the control of the charge transfer between the constituting layers is of crucial importance. Compared to bulk or 0D system, 2D materials are characterized by a large exciton binding energy (0.1–1 eV) which considerably affects the magnitude of the charge transfer. Here we investigate a model system made from colloidal 2D CdSe nanoplatelets and epitaxial graphene in a phototransistor configuration. We demonstrate that using a heterostructured layered material, we can tune the magnitude and the direction (i.e. electron or hole) of the charge transfer. We further evidence that graphene functionalization by nanocrystals only leads to a limited change in the magnitude of the 1/f noise. These results draw some new directions to design van der Waals heterostructures with enhanced optoelectronic properties.
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26
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Rabouw FT, van der Bok JC, Spinicelli P, Mahler B, Nasilowski M, Pedetti S, Dubertret B, Vanmaekelbergh D. Temporary Charge Carrier Separation Dominates the Photoluminescence Decay Dynamics of Colloidal CdSe Nanoplatelets. NANO LETTERS 2016; 16:2047-53. [PMID: 26863992 DOI: 10.1021/acs.nanolett.6b00053] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Affiliation(s)
- Freddy T. Rabouw
- Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Princetonplein 1, 3584 CC Utrecht, The Netherlands
| | - Johanna C. van der Bok
- Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Princetonplein 1, 3584 CC Utrecht, The Netherlands
| | - Piernicola Spinicelli
- Laboratoire de Physique et d’Etude
des Matériaux (LPEM), PSL Research University, ESPCI-ParisTech,
10 rue Vauquelin, F-75231 Paris Cedex 5, France
| | - Benoît Mahler
- Laboratoire de Physique et d’Etude
des Matériaux (LPEM), PSL Research University, ESPCI-ParisTech,
10 rue Vauquelin, F-75231 Paris Cedex 5, France
| | - Michel Nasilowski
- Laboratoire de Physique et d’Etude
des Matériaux (LPEM), PSL Research University, ESPCI-ParisTech,
10 rue Vauquelin, F-75231 Paris Cedex 5, France
| | - Silvia Pedetti
- Laboratoire de Physique et d’Etude
des Matériaux (LPEM), PSL Research University, ESPCI-ParisTech,
10 rue Vauquelin, F-75231 Paris Cedex 5, France
| | - Benoît Dubertret
- Laboratoire de Physique et d’Etude
des Matériaux (LPEM), PSL Research University, ESPCI-ParisTech,
10 rue Vauquelin, F-75231 Paris Cedex 5, France
| | - Daniël Vanmaekelbergh
- Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Princetonplein 1, 3584 CC Utrecht, The Netherlands
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27
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Lhuillier E, Scarafagio M, Hease P, Nadal B, Aubin H, Xu XZ, Lequeux N, Patriarche G, Ithurria S, Dubertret B. Infrared Photodetection Based on Colloidal Quantum-Dot Films with High Mobility and Optical Absorption up to THz. NANO LETTERS 2016; 16:1282-6. [PMID: 26753599 DOI: 10.1021/acs.nanolett.5b04616] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Infrared thermal imaging devices rely on narrow band gap semiconductors grown by physical methods such as molecular beam epitaxy and chemical vapor deposition. These technologies are expensive, and infrared detectors remain limited to defense and scientific applications. Colloidal quantum dots (QDs) offer a low cost alternative to infrared detector by combining inexpensive synthesis and an ease of processing, but their performances are so far limited, in terms of both wavelength and sensitivity. Herein we propose a new generation of colloidal QD-based photodetectors, which demonstrate detectivity improved by 2 orders of magnitude, and optical absorption that can be continuously tuned between 3 and 20 μm. These photodetectors are based on the novel synthesis of n-doped HgSe colloidal QDs whose size can be tuned continuously between 5 and 40 nm, and on their assembly into solid nanocrystal films with mobilities that can reach up to 100 cm(2) V(-1) s(-1). These devices can be operated at room temperature with the same level of performance as the previous generation of devices when operated at liquid nitrogen temperature. HgSe QDs can be synthesized in large scale (>10 g per batch), and we show that HgSe films can be processed to form a large scale array of pixels. Taken together, these results pave the way for the development of the next generation mid- and far-infrared low-cost detectors and camera.
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Affiliation(s)
- Emmanuel Lhuillier
- Nexdot , 10 rue Vauquelin, 75005 Paris, France
- Institut des NanoSciences de Paris, UPMC-UMR CNRS 7588 , 4 place Jussieu, 75252 Paris CEDEX 05, France
| | - Marion Scarafagio
- Nexdot , 10 rue Vauquelin, 75005 Paris, France
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-ParisTech, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS , 10 rue Vauquelin 75005 Paris, France
| | - Patrick Hease
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-ParisTech, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS , 10 rue Vauquelin 75005 Paris, France
| | - Brice Nadal
- Nexdot , 10 rue Vauquelin, 75005 Paris, France
| | - Hervé Aubin
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-ParisTech, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS , 10 rue Vauquelin 75005 Paris, France
| | - Xiang Zhen Xu
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-ParisTech, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS , 10 rue Vauquelin 75005 Paris, France
| | - Nicolas Lequeux
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-ParisTech, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS , 10 rue Vauquelin 75005 Paris, France
| | - Gilles Patriarche
- Laboratoire de Photonique et de Nanostructures, LPN/UPR20-CNRS , Route de Nozay, 91460 Marcoussis, France
| | - Sandrine Ithurria
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-ParisTech, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS , 10 rue Vauquelin 75005 Paris, France
| | - Benoit Dubertret
- Laboratoire de Physique et d'Etude des Matériaux, ESPCI-ParisTech, PSL Research University, Sorbonne Université UPMC Univ Paris 06, CNRS , 10 rue Vauquelin 75005 Paris, France
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