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

Yang, Bin; Chen, Junsheng LU ; Shi, Qi LU ; Wang, Zhengjun LU ; Gerhard, Marina LU ; Dobrovolsky, Alexander LU ; Scheblykin, Ivan G. LU ; Karki, Khadga Jung LU ; Han, Keli and Pullerits, Tõnu LU (2018) In Journal of Physical Chemistry Letters 9(17). p.5017-5022
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... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry Letters
volume
9
issue
17
pages
6 pages
publisher
The American Chemical Society
external identifiers
  • scopus:85052958076
ISSN
1948-7185
DOI
10.1021/acs.jpclett.8b02250
language
English
LU publication?
yes
id
e00e18ea-e027-471b-9535-4c7e11ec3b3f
date added to LUP
2018-10-12 08:03:35
date last changed
2019-01-06 14:09:41
@article{e00e18ea-e027-471b-9535-4c7e11ec3b3f,
  abstract     = {<p>We fabricate photodetectors based on solution-processed single CH<sub>3</sub>NH<sub>3</sub>PbBr<sub>3</sub> 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.</p>},
  author       = {Yang, Bin and Chen, Junsheng and Shi, Qi and Wang, Zhengjun and Gerhard, Marina and Dobrovolsky, Alexander and Scheblykin, Ivan G. and Karki, Khadga Jung and Han, Keli and Pullerits, Tõnu},
  issn         = {1948-7185},
  language     = {eng},
  month        = {09},
  number       = {17},
  pages        = {5017--5022},
  publisher    = {The American Chemical Society},
  series       = {Journal of Physical Chemistry Letters},
  title        = {High Resolution Mapping of Two-Photon Excited Photocurrent in Perovskite Microplate Photodetector},
  url          = {http://dx.doi.org/10.1021/acs.jpclett.8b02250},
  volume       = {9},
  year         = {2018},
}