Journal article
Heavy Mediator at Quantum Dot/Graphene Heterojunction for Efficient Charge Carrier Transfer: Alternative Approach for High-Performance Optoelectronic Devices
ACS applied materials & interfaces, v 11(29), pp 26518-26527
24 Jul 2019
PMID: 31283174
Abstract
Two-dimensional (2D) material nanocomposites have emerged as a material system for discovering new physical phenomena and developing novel devices. However, because of the low density of states of most two-dimensional materials such as graphene, the heterostructure of nanocomposites suffers from an enhanced depletion region, which can greatly reduce the efficiency of the charge carrier transfer and deteriorate the device performance. To circumvent this difficulty, here we propose an alternative approach by inserting a second 2D mediator with a heavy effective mass having a large density of states in-between the heterojunction of 2D nanocomposites. The mediator can effectively reduce the depletion region and form a type-II band alignment, which can speed up the dissociation of electron hole pairs and enhance charge carrier transfer. To illustrate the principle, we demonstrate a novel stretchable photodetector based on the combination of graphene/ReS2/perovskite quantum dots. Two-dimensional ReS2 acts as a mediator in-between highly absorbing perovskite quantum dots and a high-mobility graphene channel and a thiol-based linker between the ReS2 and the perovskite. It is found that the optical sensitivity can be enhanced by 22 times. This enhancement was ascribed to the improvement of the charge transfer efficiency as evidenced by optical spectroscopy measurements. The produced photosensors are capable of reaching the highest reported value of photoresponsivity (>10(7) A W-1) and detectivity compared to previously studied stretchable devices. Mechanical robustness with tolerable strain up to 100% and excellent stability make our device ideal for future wearable electronics.
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Details
- Title
- Heavy Mediator at Quantum Dot/Graphene Heterojunction for Efficient Charge Carrier Transfer: Alternative Approach for High-Performance Optoelectronic Devices
- Creators
- Rapti Ghosh - National Central UniversityKanchan Yadav - Institute of Physics, Academia SinicaMonika Kataria - National Central UniversityHung-I Lin - Natl Taiwan Univ, Grad Inst Appl Phys, Taipei 106, TaiwanChristy Roshini Paul Inbaraj - National Tsing Hua UniversityYu-Ming Liao - Institute of Physics, Academia SinicaYen Nguyen - Natl Taiwan Univ, Grad Inst Appl Phys, Taipei 106, TaiwanCheng-Hsin Lu - Drexel UniversityMario Hofmann - Natl Taiwan Univ, Dept Phys, Taipei 106, TaiwanRaman Sankar - National Taiwan UniversityWei-Heng Shih - Drexel UniversityYa-Ping Hsieh - Acad Sinica, Inst Atom & Mol Sci, Taipei 115, TaiwanYang-Fang Chen - National Taiwan University
- Publication Details
- ACS applied materials & interfaces, v 11(29), pp 26518-26527
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 10
- Grant note
- MOST 107-3017-F-002-001 / Ministry of Science and Technology in Taiwan; Ministry of Science and Technology, Taiwan 107L9006 / "Advanced Research Centre for Green Materials Science and Technology" from the Featured Area Research Centre Program by the Ministry of Education
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000477787200097
- Scopus ID
- 2-s2.0-85070485525
- Other Identifier
- 991019167441004721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology