Spatial localization of excitons and charge carriers in hybrid perovskite thin films

Simpson, Mary Jane; Doughty, Benjamin; Yang, Bin; Xiao, Kai; Ma, Ying -Zhong

doi:10.1021/acs.jpclett.5b01050

Title: Spatial localization of excitons and charge carriers in hybrid perovskite thin films

Journal Article · Tue Jul 21 00:00:00 EDT 2015 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.5b01050· OSTI ID:1209208

Simpson, Mary Jane ^[1]; Doughty, Benjamin ^[1]; Yang, Bin ^[1]; Xiao, Kai ^[1]; Ma, Ying -Zhong ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

The fundamental photophysics underlying the remarkably high power conversion efficiency of organic-inorganic hybrid perovskite-based solar cells has been increasingly studied using complementary spectroscopic techniques. The spatially heterogeneous polycrystalline morphology of the photoactive layers owing to the presence of distinct crystalline grains has been generally neglected in optical measurements and therefore the reported results are typically averaged over hundreds or even thousands of such grains. Here, we apply femtosecond transient absorption microscopy to spatially and temporally probe ultrafast electronic excited-state dynamics in pristine methylammonium lead tri-iodide (CH₃NH₃PbI₃) thin films and composite structures. We found that the electronic excited-state relaxation kinetics are extremely sensitive to the sample location probed, which was manifested by position-dependent decay timescales and transient signals. As a result, analysis of transient absorption kinetics acquired at distinct spatial positions enabled us to identify contributions of excitons and free charge carriers.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1209208

Journal Information:: Journal of Physical Chemistry Letters, Vol. 6, Issue 15; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 56 works

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Title: Spatial localization of excitons and charge carriers in hybrid perovskite thin films

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