Journal
APPLIED PHYSICS LETTERS
Volume 119, Issue 8, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0060494
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Funding
- JSPS (KAKENHI) [19H02822, 19K05282, 20H05120]
- Grants-in-Aid for Scientific Research [20H05120, 19K05282, 19H02822] Funding Source: KAKEN
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The study found that loading an appropriate thickness of the Cu-deficient layer (CDL) on the top part of the CuGaSe2 film can achieve a larger current flow and relatively positive photocurrent onset, effectively improving the photocathode activity. The half-cell solar-to-hydrogen efficiency reached 6.6% over the best photocathode, while the photocathode based on the CuGaSe2 film with an extremely thick CDL and a relatively thick CdS layer achieved the highest photocurrent onset potential.
Photoelectrochemical activity for water reduction (H-2 liberation) over a co-evaporated CuGaSe2 compact thin film modified with a CdS layer and Pt deposits under simulated sunlight (AM 1.5G) radiation was evaluated, specifically focusing on the impact of a Cu-deficient layer (CDL) loaded on the top part of the CuGaSe2 film. It was found that the intentional loading of the CDL with an appropriate thickness was effective for achieving a large current flow and relatively positive photocurrent onset. The half-cell solar-to-hydrogen efficiency reached 6.6% over the best photocathode used. Moreover, the highest photocurrent onset potential of more than 0.9 V vs reversible hydrogen electrode was achieved over the photocathode based on the CuGaSe2 film having an extremely thick CDL (200 nm) with a relatively thick CdS layer (90 nm) due to efficient spatial separation of photogenerated carriers.
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