All inorganic mixed halide perovskite nanocrystal-graphene hybrid photodetector : from ultrahigh gain to photostability

Hybrid graphene-perovskite photodetectors embrace the excellent photoabsorption properties of perovskites and high carrier mobility of graphene in a single device. Here, we demonstrate the integration of halide-ion-exchanged CsPbBr x I3-x nanocrystals (N...

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Main Authors: Surendran, Abhijith, Yu, Xuechao, Begum, Raihana, Tao, Ye, Wang, Qi Jie, Leong, Wei Lin
Other Authors: School of Chemical and Biomedical Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/138674
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spelling sg-ntu-dr.10356-1386742021-05-01T20:11:33Z All inorganic mixed halide perovskite nanocrystal-graphene hybrid photodetector : from ultrahigh gain to photostability Surendran, Abhijith Yu, Xuechao Begum, Raihana Tao, Ye Wang, Qi Jie Leong, Wei Lin School of Chemical and Biomedical Engineering School of Electrical and Electronic Engineering Centre for OptoElectronics and Biophotonics The Photonics Institute CINTRA CNRS/NTU/THALES Energy Research Institute @ NTU (ERI@N) Engineering::Electrical and electronic engineering Photodetector Perovskite Nanocrystals Hybrid graphene-perovskite photodetectors embrace the excellent photoabsorption properties of perovskites and high carrier mobility of graphene in a single device. Here, we demonstrate the integration of halide-ion-exchanged CsPbBr x I3-x nanocrystals (NCs) as a photoabsorber and graphene as a transport layer. The NCs conform to a cubic lattice structure and exhibit an optical band gap of 1.93 eV. The hybrid device attained a maximum responsivity of 1.13 × 104 A/W and specific detectivity of 1.17 × 1011 Jones in low light intensity (∼80 μW/cm2). Specifically, an ultrahigh photoconductive gain of 9.32 × 1010 is attained because of fast hole transit time in the graphene transistor and long recombination lifetime in the perovskite NCs simultaneously. The phototransistor also shows good stability and can maintain ∼95% of the photocurrent under continuous illumination over 5 h and ∼82% under periodic illumination over 37 h. Our results also revealed that the common issue of ion separation and segregated halide domains in mixed halide perovskite NCs do not occur under low light intensities. The intensive degradation of CsPbBr x I3-x NCs is only observed under stronger light excitation (≥55 mW/cm2), reflecting as emission shifts. Our work establishes the use of fully inorganic perovskite NCs as highly stable photodetectors with high responsivity and low power light detection. NRF (Natl Research Foundation, S’pore) ASTAR (Agency for Sci., Tech. and Research, S’pore) MOE (Min. of Education, S’pore) Accepted version 2020-05-11T09:10:47Z 2020-05-11T09:10:47Z 2019 Journal Article Surendran, A., Yu, X., Begum, R., Tao, Y., Wang, Q. J., & Leong, W. L. (2019). All inorganic mixed halide perovskite nanocrystal-graphene hybrid photodetector : from ultrahigh gain to photostability. ACS Applied Materials and Interfaces, 11(30), 27064-27072. doi:10.1021/acsami.9b06416 1944-8244 https://hdl.handle.net/10356/138674 10.1021/acsami.9b06416 31265238 2-s2.0-85070849946 30 11 27064 27072 en ACS Applied Materials and Interfaces This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials and Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsami.9b06416 application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Electrical and electronic engineering
Photodetector
Perovskite Nanocrystals
spellingShingle Engineering::Electrical and electronic engineering
Photodetector
Perovskite Nanocrystals
Surendran, Abhijith
Yu, Xuechao
Begum, Raihana
Tao, Ye
Wang, Qi Jie
Leong, Wei Lin
All inorganic mixed halide perovskite nanocrystal-graphene hybrid photodetector : from ultrahigh gain to photostability
description Hybrid graphene-perovskite photodetectors embrace the excellent photoabsorption properties of perovskites and high carrier mobility of graphene in a single device. Here, we demonstrate the integration of halide-ion-exchanged CsPbBr x I3-x nanocrystals (NCs) as a photoabsorber and graphene as a transport layer. The NCs conform to a cubic lattice structure and exhibit an optical band gap of 1.93 eV. The hybrid device attained a maximum responsivity of 1.13 × 104 A/W and specific detectivity of 1.17 × 1011 Jones in low light intensity (∼80 μW/cm2). Specifically, an ultrahigh photoconductive gain of 9.32 × 1010 is attained because of fast hole transit time in the graphene transistor and long recombination lifetime in the perovskite NCs simultaneously. The phototransistor also shows good stability and can maintain ∼95% of the photocurrent under continuous illumination over 5 h and ∼82% under periodic illumination over 37 h. Our results also revealed that the common issue of ion separation and segregated halide domains in mixed halide perovskite NCs do not occur under low light intensities. The intensive degradation of CsPbBr x I3-x NCs is only observed under stronger light excitation (≥55 mW/cm2), reflecting as emission shifts. Our work establishes the use of fully inorganic perovskite NCs as highly stable photodetectors with high responsivity and low power light detection.
author2 School of Chemical and Biomedical Engineering
author_facet School of Chemical and Biomedical Engineering
Surendran, Abhijith
Yu, Xuechao
Begum, Raihana
Tao, Ye
Wang, Qi Jie
Leong, Wei Lin
format Article
author Surendran, Abhijith
Yu, Xuechao
Begum, Raihana
Tao, Ye
Wang, Qi Jie
Leong, Wei Lin
author_sort Surendran, Abhijith
title All inorganic mixed halide perovskite nanocrystal-graphene hybrid photodetector : from ultrahigh gain to photostability
title_short All inorganic mixed halide perovskite nanocrystal-graphene hybrid photodetector : from ultrahigh gain to photostability
title_full All inorganic mixed halide perovskite nanocrystal-graphene hybrid photodetector : from ultrahigh gain to photostability
title_fullStr All inorganic mixed halide perovskite nanocrystal-graphene hybrid photodetector : from ultrahigh gain to photostability
title_full_unstemmed All inorganic mixed halide perovskite nanocrystal-graphene hybrid photodetector : from ultrahigh gain to photostability
title_sort all inorganic mixed halide perovskite nanocrystal-graphene hybrid photodetector : from ultrahigh gain to photostability
publishDate 2020
url https://hdl.handle.net/10356/138674
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