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Graphene Sandwich Stable Perovskite Quantum-Dot Light-Emissive Ultrasensitive and Ultrafast Broadband Vertical Phototransistors
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SYSNO ASEP 0536879 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Graphene Sandwich Stable Perovskite Quantum-Dot Light-Emissive Ultrasensitive and Ultrafast Broadband Vertical Phototransistors Author(s) Bera, K. P. (TW)
Haider, Golam (UFCH-W) ORCID, RID
Huang, Y.T. (TW)
Roy, P. K. (TW)
Inbaraj, Ch. R. P. (TW)
Liao, Y.-M. (TW)
Lin, H. I. (TW)
Lu, C.-H. (US)
Shen, Ch. (US)
Shih, W. Y. (US)
Shih, W.-H. (US)
Chen, Y.-F. (US)Source Title ACS Nano. - : American Chemical Society - ISSN 1936-0851
Roč. 13, č. 11 (2019), s. 12540-12552Number of pages 13 s. Language eng - English Country US - United States Keywords solar-cells ; heterostructures ; luminescent ; photodetectors ; photocurrent ; nanocrystals ; transistors ; vertical phototransistor ; led ; perovskite quantum dots ; graphene ; broadband photoresponse Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry Method of publishing Limited access Institutional support UFCH-W - RVO:61388955 UT WOS 000500650000029 EID SCOPUS 85074168309 DOI 10.1021/acsnano.9b03165 Annotation 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. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2021 Electronic address http://hdl.handle.net/11104/0314631
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