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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

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

Author

  • B Yang
  • Fengying Zhang
  • Junsheng Chen
  • Songqiu Yang
  • Xusheng Xia
  • Tõnu Pullerits
  • Weiqiao Deng
  • Keli Han

Summary, in English

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).

Department/s

  • Chemical Physics
  • NanoLund: Center for Nanoscience

Publishing year

2017-10

Language

English

Pages

1703758-1703758

Publication/Series

Advanced Materials

Volume

29

Issue

40

Document type

Journal article

Publisher

John Wiley & Sons Inc.

Topic

  • Materials Chemistry
  • Condensed Matter Physics

Keywords

  • CsPbBr
  • Optoelectronics
  • Perovskites
  • Photoluminescence
  • Single crystals

Status

Published

ISBN/ISSN/Other

  • ISSN: 0935-9648