Journal article
Graphene Sandwich Stable Perovskite Quantum-Dot Light-Emissive Ultrasensitive and Ultrafast Broadband Vertical Phototransistors
ACS nano, v 13(11), pp 12540-12552
01 Nov 2019
PMID: 31617700
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Dual-functional devices that can simultaneously detect light and emit light have a tremendous appeal for multiple applications, including displays, sensors, defense, and high-speed optical communication. Despite the tremendous efforts of scientists, the progress of integration of a phototransistor, where the built-in electric field separates the photogenerated excitons, and a light-emitting diode, where the radiative recombination can be enhanced by band offset, into a single device remains a challenge. Combining the superior properties of perovskite quantum dots (PQDs) and graphene, here we report a light-emissive, ultrasensitive, ultrafast, and broadband vertical phototransistor that can simultaneously act as an efficient photodetector and light emitter within a single device. The estimated value of the external quantum efficiency of the vertical phototransistor is similar to 1.2 X 10(10)% with a photoresponsivity of >10(9) A W-1 and a response time of <50 mu s, which exceed all the presently reported vertical phototransistor devices. We also demonstrate that the modulation of the Dirac point of graphene efficiently tunes both amplitude and polarity of the photocurrent. The device exhibits a green emission having a quantum efficiency of 5.6%. The moisture-insensitive and environmentally stable, light-emissive, ultrafast, and ultrasensitive broadband phototransistor creates a useful route for dual-functional optoelectronic devices.
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Details
- Title
- Graphene Sandwich Stable Perovskite Quantum-Dot Light-Emissive Ultrasensitive and Ultrafast Broadband Vertical Phototransistors
- Creators
- Krishna Prasad Bera - National Taiwan UniversityGolam Haider - J. Heyrovsky Institute of Physical ChemistryYu-Ting Huang - National Taiwan UniversityPradip Kumar Roy - National Taiwan UniversityChristy Roshini Paul Inbaraj - National Tsing Hua UniversityYu-Ming Liao - National Taiwan UniversityHung-I Lin - National Taiwan UniversityCheng-Hsin Lu - Drexel UniversityChun Shen - Drexel UniversityWan Y. Shih - Drexel UniversityWei-Heng Shih - Drexel UniversityYang-Fang Chen - National Taiwan University
- Publication Details
- ACS nano, v 13(11), pp 12540-12552
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 13
- Grant note
- MOST 107-3017-F-002001; 106-2112-M-005-010; 107-2218-E-005-021 / Ministry of Science and Technology, Taiwan 107L9006 / Advanced Research Center of Green Materials Science and Technology - Ministry of Education
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- School of Biomedical Engineering, Science, and Health Systems; Materials Science and Engineering
- Web of Science ID
- WOS:000500650000029
- Scopus ID
- 2-s2.0-85074168309
- Other Identifier
- 991019167344304721
UN Sustainable Development Goals (SDGs)
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology