Single-Crystalline Thin Films for Studying Intrinsic Properties of BiFeO3鈥揝rTiO3 Solid Solution Photoelectrodes in Solar Energy Conversion

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• 作者：Seungho Cho ; Ji-Wook Jang ; Wenrui Zhang ; Ady Suwardi ; Haiyan Wang ; Dunwei Wang ; Judith L. MacManus-Driscoll
• 刊名：Chemistry of Materials
• 出版年：2015
• 出版时间：October 13, 2015
• 年：2015
• 卷：27
• 期：19
• 页码：6635-6641
• 全文大小：483K
• ISSN：1520-5002

文摘

Solid solutions have been widely investigated for solar energy conversion because of the ease to control properties (e.g., band edge positions, charge carrier transport, and chemical stability). In this study, we introduce a new method to investigate intrinsic solar energy conversion properties of solid solutions through fabricating high-quality single-crystalline solid solution films by pulsed laser deposition. This method rules out external factors, such as morphology, crystalline grain size, orientation, density and distribution, surface area, and particle鈥損article or particle鈥揷onducting layer connection, that have plagued previous studies on solid solution photoelectrodes. Perovskite BiFeO₃ (BFO) and SrTiO₃ (STO) were chosen as 鈥渆nd鈥?members of the solid solutions (i.e., (BFO)_x(STO)_1鈥?i>x (0 鈮?x 鈮?1)). Optical and photoelectrochemical (PEC) properties of the solid solutions significantly varied with changing compositions. Among the six studied compositions, BFO:STO (3:1 molar ratio) exhibited the highest photocurrent density with the photovoltage of 1.08 V. The photoelectrode also produced stable photocurrent for 12 h. Faradaic efficiencies of H₂ and O₂ formation close to 100% were measured.