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Ultrasensitive and Fast All-Inorganic Perovskite-Based Photodetector via Fast Carrier Diffusion

Yang, B; Zhang, Fengying LU ; Chen, Junsheng LU ; Yang, Songqiu; Xia, Xusheng; Pullerits, Tõnu LU ; Deng, Weiqiao and Han, Keli (2017) In Advanced Materials
Abstract

Low trap-state density, high carrier mobility, and efficient charge carrier collection are key parameters for photodetectors with high sensitivity and fast response time. This study demonstrates a simple solution growth method to prepare CsPbBr3 microcrystals (MCs) with low trap-state density. Time-dependent photoluminescence study with one-photon excitation (OPE) and two-photon excitation (TPE) indicates that CsPbBr3 MCs exhibit fast carrier diffusion with carrier mobility over 100 cm2 V-1 S-1. Furthermore, CsPbBr3 MC-based photodetectors with high charge carriers' collection efficiency are fabricated. Such photodetectors show ultrahigh responsivity (R) up to 6 ×... (More)

Low trap-state density, high carrier mobility, and efficient charge carrier collection are key parameters for photodetectors with high sensitivity and fast response time. This study demonstrates a simple solution growth method to prepare CsPbBr3 microcrystals (MCs) with low trap-state density. Time-dependent photoluminescence study with one-photon excitation (OPE) and two-photon excitation (TPE) indicates that CsPbBr3 MCs exhibit fast carrier diffusion with carrier mobility over 100 cm2 V-1 S-1. Furthermore, CsPbBr3 MC-based photodetectors with high charge carriers' collection efficiency are fabricated. Such photodetectors show ultrahigh responsivity (R) up to 6 × 104 A W-1 with OPE and high R up to 6 A W-1 with TPE. The R for OPE is over one order of magnitude higher (the R for TPE is three orders of magnitude higher) than that of previously reported all-inorganic perovskite-based photodetectors. Moreover, the photodetectors exhibit fast response time of ≈1 ms, which corresponds to a gain ≈105 and a gain- bandwidth product of 108 Hz for OPE (a gain ≈103 and a gain-bandwidth product of 106 Hz for TPE).

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
CsPbBr, Optoelectronics, Perovskites, Photoluminescence, Single crystals
in
Advanced Materials
publisher
John Wiley & Sons
external identifiers
  • scopus:85028589031
  • wos:000413406200024
ISSN
0935-9648
DOI
10.1002/adma.201703758
language
English
LU publication?
yes
id
ee1197bc-8f73-498d-8e7d-2cb3c5bd87df
date added to LUP
2017-09-28 09:46:50
date last changed
2018-01-16 13:19:47
@article{ee1197bc-8f73-498d-8e7d-2cb3c5bd87df,
  abstract     = {<p>Low trap-state density, high carrier mobility, and efficient charge carrier collection are key parameters for photodetectors with high sensitivity and fast response time. This study demonstrates a simple solution growth method to prepare CsPbBr<sub>3</sub> microcrystals (MCs) with low trap-state density. Time-dependent photoluminescence study with one-photon excitation (OPE) and two-photon excitation (TPE) indicates that CsPbBr<sub>3</sub> MCs exhibit fast carrier diffusion with carrier mobility over 100 cm<sup>2</sup> V<sup>-1</sup> S<sup>-1</sup>. Furthermore, CsPbBr<sub>3</sub> MC-based photodetectors with high charge carriers' collection efficiency are fabricated. Such photodetectors show ultrahigh responsivity (R) up to 6 × 10<sup>4</sup> A W<sup>-1</sup> with OPE and high R up to 6 A W<sup>-1</sup> with TPE. The R for OPE is over one order of magnitude higher (the R for TPE is three orders of magnitude higher) than that of previously reported all-inorganic perovskite-based photodetectors. Moreover, the photodetectors exhibit fast response time of ≈1 ms, which corresponds to a gain ≈10<sup>5</sup> and a gain- bandwidth product of 10<sup>8</sup> Hz for OPE (a gain ≈10<sup>3</sup> and a gain-bandwidth product of 10<sup>6</sup> Hz for TPE).</p>},
  author       = {Yang, B and Zhang, Fengying and Chen, Junsheng and Yang, Songqiu and Xia, Xusheng and Pullerits, Tõnu and Deng, Weiqiao and Han, Keli},
  issn         = {0935-9648},
  keyword      = {CsPbBr,Optoelectronics,Perovskites,Photoluminescence,Single crystals},
  language     = {eng},
  month        = {09},
  publisher    = {John Wiley & Sons},
  series       = {Advanced Materials},
  title        = {Ultrasensitive and Fast All-Inorganic Perovskite-Based Photodetector via Fast Carrier Diffusion},
  url          = {http://dx.doi.org/10.1002/adma.201703758},
  year         = {2017},
}