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

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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.


Enheter & grupper
Externa organisationer
  • Dalian Institute of Chemical Physics
  • University of the Chinese Academy of Sciences

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Fysikalisk kemi
Sidor (från-till)5017-5022
Antal sidor6
TidskriftJournal of Physical Chemistry Letters
Utgåva nummer17
StatusPublished - 2018 sep 6
Peer review utfördJa