Tuning the Excited-State Dynamics of CuI Films with Electrochemical Bias
- Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, United States, Department of Physical Chemistry and Materials Science, Interdisciplinary Excellence Centre, University of Szeged, Rerrich Square 1, Szeged H-6720, Hungary, ELI-ALPS Research Institute, Dugonics Square 13, Szeged 6720, Hungary
- Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, United States, Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
- Department of Physical Chemistry and Materials Science, Interdisciplinary Excellence Centre, University of Szeged, Rerrich Square 1, Szeged H-6720, Hungary
- Department of Physical Chemistry and Materials Science, Interdisciplinary Excellence Centre, University of Szeged, Rerrich Square 1, Szeged H-6720, Hungary, ELI-ALPS Research Institute, Dugonics Square 13, Szeged 6720, Hungary
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.
- Research Organization:
- University of Notre Dame, IN (United States); Univ. of Szeged (Hungary)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); European Research Council (ERC); European Regional Development Fund (ERDF); Ministry of Human Capacities (Hungary)
- 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
- OSTI ID:
- 1495068
- Alternate ID(s):
- OSTI ID: 1508764
- Journal Information:
- ACS Energy Letters, Journal Name: ACS Energy Letters Vol. 4 Journal Issue: 3; ISSN 2380-8195
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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