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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

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
StatePublished - 6 Sep 2018
Externally publishedYes

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