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Title: Optoelectronic Properties of CuI Photoelectrodes

Abstract

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.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]
  1. Univ. of Szeged, Szeged (Hungary)
  2. Univ. of Szeged, Szeged (Hungary); ELI-ALPS Research Inst., Szeged (Hungary); Univ. of Notre Dame, Notre Dame, IN (United States)
  3. Univ. of Notre Dame, Notre Dame, IN (United States)
  4. Univ. of Szeged, Szeged (Hungary); ELI-ALPS Research Inst., Szeged (Hungary)
Publication Date:
Research Org.:
Univ. of Notre Dame, Notre Dame, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division, European Research Council (ERC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1489709
Alternate Identifier(s):
OSTI ID: 1508809
Grant/Contract Number:  
FC02-04ER15533
Resource Type:
Journal Article: Published Article
Journal Name:
Journal of Physical Chemistry Letters
Additional Journal Information:
Journal Volume: 10; Journal Issue: 2; Journal ID: ISSN 1948-7185
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Balog, Ádám, Samu, Gergely F., Kamat, Prashant V., and Janáky, Csaba. Optoelectronic Properties of CuI Photoelectrodes. United States: N. p., 2019. Web. doi:10.1021/acs.jpclett.8b03242.
Balog, Ádám, Samu, Gergely F., Kamat, Prashant V., & Janáky, Csaba. Optoelectronic Properties of CuI Photoelectrodes. United States. doi:10.1021/acs.jpclett.8b03242.
Balog, Ádám, Samu, Gergely F., Kamat, Prashant V., and Janáky, Csaba. Wed . "Optoelectronic Properties of CuI Photoelectrodes". United States. doi:10.1021/acs.jpclett.8b03242.
@article{osti_1489709,
title = {Optoelectronic Properties of CuI Photoelectrodes},
author = {Balog, Ádám and Samu, Gergely F. and Kamat, Prashant V. and Janáky, Csaba},
abstractNote = {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.},
doi = {10.1021/acs.jpclett.8b03242},
journal = {Journal of Physical Chemistry Letters},
issn = {1948-7185},
number = 2,
volume = 10,
place = {United States},
year = {2019},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1021/acs.jpclett.8b03242

Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

Figures / Tables:

Figure 1. Figure 1.: (A) UV−vis absorbance spectra of ITO/CuI electrodes before and after annealing at 150 °C for 10 min. (B) SEM image of the annealed ITO/CuI electrode. (C) Photovoltammograms of the annealed CuI/ITO electrode. The measurement was recorded in argon- and oxygen-saturated 0.1 mol dm−3 Bu4NPF6/dichloromethane electrolyte, using a solarmore » simulator as the light source (AM1.5), with an additional UV cutoff filter (<400 nm) operated at 100 mW cm−2. The sweep rate was kept at 1 mV s−1, while the light-chopping frequency was 0.05 Hz.« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.