Optoelectronic Properties of CuI Photoelectrodes

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

doi:10.1021/acs.jpclett.8b03242

Title: Optoelectronic Properties of CuI Photoelectrodes

Journal Article · Wed Jan 02 00:00:00 EST 2019 · Journal of Physical Chemistry Letters

DOI:https://doi.org/10.1021/acs.jpclett.8b03242· OSTI ID:1489709

Balog, Ádám ^[1];

^[2];

^[3];

^[4]

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 sq. 13, Szeged 6720, Hungary, Department of Chemistry and Biochemistry, 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, 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 sq. 13, Szeged 6720, Hungary

Detailed mechanistic understanding of the optoelectronic features is a key factor in designing efficient and stable photoelectrodes. In situ spectroelectrochemical methods were employed to scrutinize the effect of trap states on the optical and electronic properties of CuI photoelectrodes and to assess their stability against (photo)electrochemical corrosion. The excitonic band in the absorption spectrum and the Raman spectral features were directly influenced by the applied bias potential. These spectral changes exhibit a good correlation with the alterations observed in the charge-transfer resistance. Interestingly, the population and depopulation of the trap states, which are responsible for the changes in both the optical and electronic properties, occur in a different potential/energy regime. Although cathodic photocorrosion of CuI is thermodynamically favored, this process is kinetically hindered, thus providing good stability in photoelectrochemical operation.

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Research Organization:: University of Notre Dame, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division, European Research Council (ERC)

Grant/Contract Number:: FC02-04ER15533

OSTI ID:: 1489709

Alternate ID(s):: OSTI ID: 1508809

Journal Information:: Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Vol. 10 Journal Issue: 2; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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