Graphene Sandwich Stable Perovskite Quantum-Dot Light-Emissive Ultrasensitive and Ultrafast Broadband Vertical Phototransistors

0536879 - ÚFCH JH 2021 RIV US eng J - Journal Article
Bera, K. P. - Haider, Golam - Huang, Y.T. - Roy, P. K. - Inbaraj, Ch. R. P. - Liao, Y.-M. - Lin, H. I. - Lu, C.-H. - Shen, Ch. - Shih, W. Y. - Shih, W.-H. - Chen, Y.-F.
Graphene Sandwich Stable Perovskite Quantum-Dot Light-Emissive Ultrasensitive and Ultrafast Broadband Vertical Phototransistors.
ACS Nano. Roč. 13, č. 11 (2019), s. 12540-12552. ISSN 1936-0851. E-ISSN 1936-086X
Grant - others:Ministerstvo školství, mládeže a tělovýchovy - GA MŠk(CZ) 107L9006
Institutional support: RVO:61388955
Keywords : solar-cells * heterostructures * luminescent * photodetectors * photocurrent * nanocrystals * transistors * vertical phototransistor * led * perovskite quantum dots * graphene * broadband photoresponse
OECD category: Physical chemistry
Impact factor: 14.588, year: 2019
Method of publishing: Limited access

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.
Permanent Link: http://hdl.handle.net/11104/0314631