A Liquid Junction Photoelectrochemical Solar Cell Based on p-Type MeNH3PbI3 Perovskite with 1.05 V Open-Circuit Photovoltage

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• 作者：Hsien-Yi Hsu ; Li Ji ; Hyun S. Ahn ; Ji Zhao ; Edward T. Yu ; Allen J. Bard
• 刊名：Journal of the American Chemical Society
• 出版年：2015
• 出版时间：November 25, 2015
• 年：2015
• 卷：137
• 期：46
• 页码：14758-14764
• 全文大小：417K
• ISSN：1520-5126

文摘

A liquid junction photoelectrochemical (PEC) solar cell based on p-type methylammonium lead iodide (p-MeNH₃PbI₃) perovskite with a large open-circuit voltage is developed. MeNH₃PbI₃ perovskite is readily soluble or decomposed in many common solvents. However, the solvent dichloromethane (CH₂Cl₂) can be employed to form stable liquid junctions. These were characterized with photoelectrochemical cells with several redox couples, including I₃^{鈥?/sup>/I鈥?/sup>, Fc/Fc+, DMFc/DMFc+, and BQ/BQ鈥⑩€?/sup> (where Fc is ferrocene, DMFc is decamethylferrocene, BQ is benzoquinone) in CH₂Cl₂. The solution-processed MeNH₃PbI₃ shows cathodic photocurrents and hence p-type behavior. The difference between the photocurrent onset potential and the standard potential for BQ/BQ鈥⑩€?/sup> is 1.25 V, which is especially large for a semiconductor with a band gap of 1.55 eV. A PEC photovoltaic cell, with a configuration of p-MeNH₃PbI₃/CH₂Cl₂, BQ (2 mM), BQ鈥⑩€?/sup> (2 mM)/carbon, shows an open-circuit photovoltage of 1.05 V and a short-circuit current density of 7.8 mA/cm2 under 100 mW/cm2 irradiation. The overall optical-to-electrical energy conversion efficiency is 6.1%. The PEC solar cell shows good stability for 5 h under irradiation.}