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Title: Tuning the Excited-State Dynamics of CuI Films with Electrochemical Bias

Abstract

Owing to its high hole conductivity and ease of preparation, CuI was among the first inorganic hole-transporting materials that were introduced early on in metal halide perovskite solar cells, but its full potential as a semiconductor material is still to be realized. We have now performed ultrafast spectroelectrochemical experiments on ITO/CuI electrodes to show the effect of applied bias on the excited-state dynamics in CuI. Under operating conditions, the recombination of excitons is dependent on the applied bias, and it can be accelerated by decreasing the potential from +0.6 to -0.1 V vs Ag/AgCl. Prebiasing experiments show the persistent and reversible “memory” effect of electrochemical bias on charge carrier lifetimes. The excitation of CuI in a CuI/CsPbBr 3 film provides synergy between both CuI and CsPbBr 3 in dictating the charge separation and recombination.

Authors:
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [2]
  1. Univ. of Notre Dame, IN (United States). Radiation Lab.; Univ. of Szeged (Hungary). Dept. of Physical Chemistry and Materials Science. Interdisciplinary Excellence Centre; ELI-ALPS Research Inst., Szeged (Hungary)
  2. Univ. of Notre Dame, IN (United States). Radiation Lab. Dept. of Chemistry and Biochemistry
  3. Univ. of Szeged (Hungary). Dept. of Physical Chemistry and Materials Science. Interdisciplinary Excellence Centre
  4. Univ. of Szeged (Hungary). Dept. of Physical Chemistry and Materials Science. Interdisciplinary Excellence Centre; ELI-ALPS Research Inst., Szeged (Hungary)
Publication Date:
Research Org.:
Univ. of Notre Dame, IN (United States); Univ. of Szeged (Hungary)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); European Research Council (ERC); European Regional Development Fund (ERDF); Ministry of Human Capacities (Hungary)
OSTI Identifier:
1495068
Alternate Identifier(s):
OSTI ID: 1508764
Grant/Contract Number:  
FC02-04ER15533; 716539; GOP-1.1.1-12/B-2012-000; GINOP-2.3.6-15-2015-00001; 20391-3/2018/FEKUSTRAT
Resource Type:
Published Article
Journal Name:
ACS Energy Letters
Additional Journal Information:
Journal Volume: 4; Journal Issue: 3; Journal ID: ISSN 2380-8195
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Samu, Gergely F., Scheidt, Rebecca A., Balog, Ádám, Janáky, Csaba, and Kamat, Prashant V. Tuning the Excited-State Dynamics of CuI Films with Electrochemical Bias. United States: N. p., 2019. Web. doi:10.1021/acsenergylett.9b00182.
Samu, Gergely F., Scheidt, Rebecca A., Balog, Ádám, Janáky, Csaba, & Kamat, Prashant V. Tuning the Excited-State Dynamics of CuI Films with Electrochemical Bias. United States. doi:10.1021/acsenergylett.9b00182.
Samu, Gergely F., Scheidt, Rebecca A., Balog, Ádám, Janáky, Csaba, and Kamat, Prashant V. Wed . "Tuning the Excited-State Dynamics of CuI Films with Electrochemical Bias". United States. doi:10.1021/acsenergylett.9b00182.
@article{osti_1495068,
title = {Tuning the Excited-State Dynamics of CuI Films with Electrochemical Bias},
author = {Samu, Gergely F. and Scheidt, Rebecca A. and Balog, Ádám and Janáky, Csaba and Kamat, Prashant V.},
abstractNote = {Owing to its high hole conductivity and ease of preparation, CuI was among the first inorganic hole-transporting materials that were introduced early on in metal halide perovskite solar cells, but its full potential as a semiconductor material is still to be realized. We have now performed ultrafast spectroelectrochemical experiments on ITO/CuI electrodes to show the effect of applied bias on the excited-state dynamics in CuI. Under operating conditions, the recombination of excitons is dependent on the applied bias, and it can be accelerated by decreasing the potential from +0.6 to -0.1 V vs Ag/AgCl. Prebiasing experiments show the persistent and reversible “memory” effect of electrochemical bias on charge carrier lifetimes. The excitation of CuI in a CuI/CsPbBr3 film provides synergy between both CuI and CsPbBr3 in dictating the charge separation and recombination.},
doi = {10.1021/acsenergylett.9b00182},
journal = {ACS Energy Letters},
number = 3,
volume = 4,
place = {United States},
year = {2019},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1021/acsenergylett.9b00182

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