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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

High Resolution Mapping of Two-Photon Excited Photocurrent in Perovskite Microplate Photodetector

Author

  • Bin Yang
  • Junsheng Chen
  • Qi Shi
  • Zhengjun Wang
  • Marina Gerhard
  • Alexander Dobrovolsky
  • Ivan G. Scheblykin
  • Khadga Jung Karki
  • Keli Han
  • Tõnu Pullerits

Summary, in English

We fabricate photodetectors based on solution-processed single CH3NH3PbBr3 microcrystals (MCs) and map the two-photon absorption (TPA) excited photocurrent (PC) with spatial resolution of 1 μm. We find that the charge carrier transport length in the MCs depends on the applied electric field, and increases from 5.7 μm for 0.02 V bias (dominated by carrier diffusion) to 23.2 μm for 2 V bias (dominated by carrier drift). Furthermore, PC shows strong spatial variations. Combining the PC mapping results with time-resolved photoluminescence microscopy, we demonstrate that the spatial distribution of PC mainly originates from the inhomogeneous distribution of trap-states across perovskite MCs. This suggests that there is still large margin for improvement of perovskite single crystal devices by better controlling of the traps.

Department/s

  • NanoLund: Center for Nanoscience
  • Chemical Physics

Publishing year

2018-09-06

Language

English

Pages

5017-5022

Publication/Series

Journal of Physical Chemistry Letters

Volume

9

Issue

17

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Physical Chemistry
  • Condensed Matter Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1948-7185