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

Samu, Gergely F.; Scheidt, Rebecca A.; Balog, Ádám; Janáky, Csaba; Kamat, Prashant V.

doi:10.1021/acsenergylett.9b00182

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

Journal Article · Wed Feb 13 00:00:00 EST 2019 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.9b00182· OSTI ID:1495068

^[1]; Scheidt, Rebecca A. ^[2]; Balog, Ádám ^[3]; Janáky, Csaba ^[4];

^[2]

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.

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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)