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

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

Research output: Contribution to journalArticlepeer-review

27 Citations (SciVal)

Abstract

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.

Original languageEnglish
Pages (from-to)5017-5022
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume9
Issue number17
DOIs
Publication statusPublished - 2018 Sep 6

Subject classification (UKÄ)

  • Physical Chemistry
  • Condensed Matter Physics

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