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Title: Imaging electronic trap states in perovskite thin films with combined fluorescence and femtosecond transient absorption microscopy

Abstract

Charge carrier trapping degrades the performance of organometallic halide perovskite solar cells. To characterize the locations of electronic trap states in a heterogeneous photoactive layer, a spatially resolved approach is essential. Here, we report a comparative study on methylammonium lead tri-iodide perovskite thin films subject to different thermal annealing times using a combined photoluminescence (PL) and femtosecond transient absorption microscopy (TAM) approach to spatially map trap states. This approach coregisters the initially populated electronic excited states with the regions that recombine radiatively. Although the TAM images are relatively homogeneous for both samples, the corresponding PL images are highly structured. The remarkable variation in the PL intensities as compared to transient absorption signal amplitude suggests spatially dependent PL quantum efficiency, indicative of trapping events. Furthermore, detailed analysis enables identification of two trapping regimes: a densely packed trapping region and a sparse trapping area that appear as unique spatial features in scaled PL maps.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1252155
Grant/Contract Number:
AC05-00OR22725
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Physical Chemistry Letters
Additional Journal Information:
Journal Volume: 7; Journal Issue: 9; Journal ID: ISSN 1948-7185
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Xiao, Kai, Ma, Ying -Zhong, Simpson, Mary Jane, Doughty, Benjamin, and Yang, Bin. Imaging electronic trap states in perovskite thin films with combined fluorescence and femtosecond transient absorption microscopy. United States: N. p., 2016. Web. doi:10.1021/acs.jpclett.6b00715.
Xiao, Kai, Ma, Ying -Zhong, Simpson, Mary Jane, Doughty, Benjamin, & Yang, Bin. Imaging electronic trap states in perovskite thin films with combined fluorescence and femtosecond transient absorption microscopy. United States. doi:10.1021/acs.jpclett.6b00715.
Xiao, Kai, Ma, Ying -Zhong, Simpson, Mary Jane, Doughty, Benjamin, and Yang, Bin. Fri . "Imaging electronic trap states in perovskite thin films with combined fluorescence and femtosecond transient absorption microscopy". United States. doi:10.1021/acs.jpclett.6b00715. https://www.osti.gov/servlets/purl/1252155.
@article{osti_1252155,
title = {Imaging electronic trap states in perovskite thin films with combined fluorescence and femtosecond transient absorption microscopy},
author = {Xiao, Kai and Ma, Ying -Zhong and Simpson, Mary Jane and Doughty, Benjamin and Yang, Bin},
abstractNote = {Charge carrier trapping degrades the performance of organometallic halide perovskite solar cells. To characterize the locations of electronic trap states in a heterogeneous photoactive layer, a spatially resolved approach is essential. Here, we report a comparative study on methylammonium lead tri-iodide perovskite thin films subject to different thermal annealing times using a combined photoluminescence (PL) and femtosecond transient absorption microscopy (TAM) approach to spatially map trap states. This approach coregisters the initially populated electronic excited states with the regions that recombine radiatively. Although the TAM images are relatively homogeneous for both samples, the corresponding PL images are highly structured. The remarkable variation in the PL intensities as compared to transient absorption signal amplitude suggests spatially dependent PL quantum efficiency, indicative of trapping events. Furthermore, detailed analysis enables identification of two trapping regimes: a densely packed trapping region and a sparse trapping area that appear as unique spatial features in scaled PL maps.},
doi = {10.1021/acs.jpclett.6b00715},
journal = {Journal of Physical Chemistry Letters},
number = 9,
volume = 7,
place = {United States},
year = {Fri Apr 22 00:00:00 EDT 2016},
month = {Fri Apr 22 00:00:00 EDT 2016}
}

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Cited by: 7works
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