Template Engineering of CuBi(2)O(4)Single-Crystal Thin Film Photocathodes

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To develop strategies for efficient photo-electrochemical water-splitting, it is important to understand the fundamental properties of oxide photoelectrodes by synthesizing and investigating their single-crystal thin films. However, it is challenging to synthesize high-quality single-crystal thin films from copper-based oxide photoelectrodes due to the occurrence of significant defects such as copper or oxygen vacancies and grains. Here, the CuBi2O4(CBO) single-crystal thin film photocathode is achieved using a NiO template layer grown on single-crystal SrTiO3(STO) (001) substrate via pulsed laser deposition. The NiO template layer plays a role as a buffer layer of large lattice mismatch between CBO and STO (001) substrate through domain-matching epitaxy, and forms a type-II band alignment with CBO, which prohibits the transfer of photogenerated electrons toward bottom electrode. The photocurrent densities of the CBO single-crystal thin film photocathode demonstrate -0.4 and -0.7 mA cm(-2)at even 0 V(RHE)with no severe dark current under illumination in a 0.1mpotassium phosphate buffer solution without and with H(2)O(2)as an electron scavenger, respectively. The successful synthesis of high-quality CBO single-crystal thin film would be a cornerstone for the in-depth understanding of the fundamental properties of CBO toward efficient photo-electrochemical water-splitting.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2020-10
Language
English
Article Type
Article
Citation

SMALL, v.16, no.39, pp.2002429

ISSN
1613-6810
DOI
10.1002/smll.202002429
URI
http://hdl.handle.net/10203/279539
Appears in Collection
MS-Journal Papers(저널논문)
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