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Title: Probing the CZTS/CdS heterojunction utilizing photoelectrochemistry and x-ray absorption spectroscopy

Abstract

The importance of renewable resources is becoming more and more influential on research due to the depletion of fossil fuels. Cost-effective ways of harvesting solar energy should also be at the forefront of these investigations. Cu2ZnSnS4 (CZTS) solar cells are well within the frame of these goals, and a thorough understanding of how they are made and processed synthetically is crucial. The CZTS/CdS heterojunction was examined using photoelectrochemistry and synchrotron radiation (SR) spectroscopy. These tools provided physical insights into this interface that was formed by the electrophoretic deposition of CZTS nanocrystals and chemical bath deposition (CBD) of CdS for the respective films. It was discovered that CBD induced a change in the local and long range environment of the Zn in the CZTS lattice, which was detrimental to the photoresponse. X-ray absorption near-edge structures and extended X-ray absorption fine structures (EXAFSs) of the junction showed that this change was at an atomic level and was associated with the coordination of oxygen to zinc. This was confirmed through FEFF fitting of the EXAFS and through IR spectroscopy. It was found that this change in both photoresponse and the Zn coordination can be reversed with the use of low temperature annealing. Investigatingmore » CZTS through SR techniques provides detailed structural information of minor changes from the zinc perspective.« less

Authors:
 [1];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1]
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  1. Soochow Univ.-Western Univ. Centre for Synchrotron Radiation Research (Taiwan); The Univ. of Western Ontario, London, ON (Canada)
Publication Date:
Research Org.:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1491876
Alternate Identifier(s):
OSTI ID: 1431382
Grant/Contract Number:  
AC02-06CH11357; RGPIN-2013-201697; STPGP-2016-493924
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 148; Journal Issue: 13; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Synchrotron radiation; Chemical elements; Nanocrystals; Photoelectrochemistry; Transition metal chalcogenides; Infrared spectroscopy; Solar energy; Thin film deposition; X-ray absorption spectroscopy; Heterostructures

Citation Formats

Turnbull, Matthew J., Vaccarello, Daniel, Wong, Jonathan, Yiu, Yun Mui, Sham, Tsun-Kong, and Ding, Zhifeng. Probing the CZTS/CdS heterojunction utilizing photoelectrochemistry and x-ray absorption spectroscopy. United States: N. p., 2018. Web. doi:10.1063/1.5016351.
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Turnbull, Matthew J., Vaccarello, Daniel, Wong, Jonathan, Yiu, Yun Mui, Sham, Tsun-Kong, & Ding, Zhifeng. Probing the CZTS/CdS heterojunction utilizing photoelectrochemistry and x-ray absorption spectroscopy. United States. https://doi.org/10.1063/1.5016351
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Turnbull, Matthew J., Vaccarello, Daniel, Wong, Jonathan, Yiu, Yun Mui, Sham, Tsun-Kong, and Ding, Zhifeng. Tue . "Probing the CZTS/CdS heterojunction utilizing photoelectrochemistry and x-ray absorption spectroscopy". United States. https://doi.org/10.1063/1.5016351. https://www.osti.gov/servlets/purl/1491876.
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@article{osti_1491876,
title = {Probing the CZTS/CdS heterojunction utilizing photoelectrochemistry and x-ray absorption spectroscopy},
author = {Turnbull, Matthew J. and Vaccarello, Daniel and Wong, Jonathan and Yiu, Yun Mui and Sham, Tsun-Kong and Ding, Zhifeng},
abstractNote = {The importance of renewable resources is becoming more and more influential on research due to the depletion of fossil fuels. Cost-effective ways of harvesting solar energy should also be at the forefront of these investigations. Cu2ZnSnS4 (CZTS) solar cells are well within the frame of these goals, and a thorough understanding of how they are made and processed synthetically is crucial. The CZTS/CdS heterojunction was examined using photoelectrochemistry and synchrotron radiation (SR) spectroscopy. These tools provided physical insights into this interface that was formed by the electrophoretic deposition of CZTS nanocrystals and chemical bath deposition (CBD) of CdS for the respective films. It was discovered that CBD induced a change in the local and long range environment of the Zn in the CZTS lattice, which was detrimental to the photoresponse. X-ray absorption near-edge structures and extended X-ray absorption fine structures (EXAFSs) of the junction showed that this change was at an atomic level and was associated with the coordination of oxygen to zinc. This was confirmed through FEFF fitting of the EXAFS and through IR spectroscopy. It was found that this change in both photoresponse and the Zn coordination can be reversed with the use of low temperature annealing. Investigating CZTS through SR techniques provides detailed structural information of minor changes from the zinc perspective.},
doi = {10.1063/1.5016351},
journal = {Journal of Chemical Physics},
number = 13,
volume = 148,
place = {United States},
year = {Tue Apr 03 00:00:00 EDT 2018},
month = {Tue Apr 03 00:00:00 EDT 2018}
}
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