Wilson, Samantha S. and Bosco, Jeffrey P. and Tolstova, Yulia and Scanlon, David O. and Watson, Graeme W. and Atwater, Harry A. (2014) Interface stoichiometry control to improve device voltage and modify band alignment in ZnO/Cu_2O heterojunction solar cells. Energy and Environmental Science, 7 (11). pp. 3606-3610. ISSN 1754-5692. doi:10.1039/c4ee01956c. https://resolver.caltech.edu/CaltechAUTHORS:20141001-091528241
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Abstract
The interface stoichiometry of cuprous oxide (Cu_2O) was controlled by adjusting the O_2 and Zn partial pressures during ZnO sputter deposition and measured by high-resolution X-ray photoelectron spectroscopy of ultrathin (<3 nm) ZnO films on Cu_2O. Open-circuit voltage measurements for ZnO/Cu_2O heterojunctions under AM1.5 illumination were measured and it was found that a stoichiometric interface can achieve the voltage entitlement dictated by the band alignment, whereas the non-stoichiometric interface showed large open-circuit voltage deficits. These results highlight not only the need for stoichiometric interfaces in Cu_2O devices, but also a reproducible experimental method for achieving stoichiometric interfaces that could be applied to any potential heterojunction partner. Additionally, valence-band offset measurements indicated changing the interface stoichiometry shifted the band alignment between Cu_2O and ZnO, which accounts for the variation in previously reported band offset values.
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| Alternate Title: | Interface stoichiometry control to improve device voltage and modify band alignment in ZnO/Cu2O heterojunction solar cells | |||||||||
| Additional Information: | © 2014 The Royal Society of Chemistry. Received 25 Jun 2014, Accepted 28 Aug 2014; First published online 05 Sep 2014. XPS data were collected at the Molecular Materials Research Center of the Beckman Institute of the California Institute of Technology. The authors would like to acknowledge The DOW Chemical Company for funding and collaborating in this work. | |||||||||
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| Issue or Number: | 11 | |||||||||
| DOI: | 10.1039/c4ee01956c | |||||||||
| Record Number: | CaltechAUTHORS:20141001-091528241 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20141001-091528241 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 50135 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 09 Oct 2014 22:25 | |||||||||
| Last Modified: | 10 Nov 2021 18:52 |
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