期刊
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
卷 2023, 期 -, 页码 -出版社
WILEY-HINDAWI
DOI: 10.1155/2023/1287144
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We examined the impact of stoichiometry on photovoltages and photocurrents in CuBi2O4 thin-film photocathodes by growing them under different oxygen partial pressures. The X-ray diffraction patterns confirmed crystalline phases in the CuBi2O4 thin films, and analysis revealed varying Cu/Bi ratios ranging from approximately 0.3 to 0.5. The slightly off-stoichiometric CuBi2O4 thin-film photocathode with a Cu/Bi ratio of approximately 0.44 exhibited the highest photocurrent density and significant stability.
We investigated the effects of stoichiometry on photovoltages and photocurrents in CuBi2O4 thin-film photocathodes grown by pulsed laser deposition under different oxygen partial pressures to manipulate their stoichiometry. While the X-ray diffraction patterns show crystalline phases in the CuBi2O4 thin films, it is found that the Cu/Bi ratio of the CuBi2O4 thin films varied from similar to 0.3 to similar to 0.5 which are analyzed by X-ray photoelectron spectroscopy and energy-dispersive X-ray spectroscopy. The slightly off-stoichiometric CuBi2O4 thin-film photocathode with a Cu/Bi ratio of similar to 0.44 shows the highest photocurrent density in the CuBi2O4 thin films. More interestingly, the off-stoichiometric CuBi2O4 thin-film photocathode with a Cu/Bi ratio of similar to 0.44 exhibited a stable open-circuit voltage difference of similar to 0.2 VRHE without severe degradation over time. On the other hand, the photovoltage of the stoichiometric CuBi2O4 thin-film photocathode with a Cu/Bi ratio of similar to 0.5 gradually decreased as a function of time. Our results suggest that stoichiometry manipulation can be one of the promising strategies to achieve long-term stable Cu-based oxide photocathodes with the maintenance of a stable photovoltage.
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