Mesoporous BaTiO3/TiO2 Double Layer for Electron Transport in Perovskite Solar Cells

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• 作者：Yuji Okamoto ; Yoshikazu Suzuki
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：July 7, 2016
• 年：2016
• 卷：120
• 期：26
• 页码：13995-14000
• 全文大小：401K
• 年卷期：0
• ISSN：1932-7455

文摘

We report on the effect of BaTiO₃/TiO₂ mesoporous double layer (MDL) in the electron transport layer (ETL) of perovskite solar cells and enhancement of the photovoltaic performance. The conversion efficiency was enhanced from 9.89% for TiO₂ mesoporous single layer (MSL) to 12.4% for BaTiO₃/TiO₂ MDL. The CH₃NH₃PbI₃ crystal size on the BaTiO₃/TiO₂ MDL was larger. The larger CH₃NH₃PbI₃ crystals resulted in the better light absorption and improved J_SC. Moreover, V_OC was also improved by suppressing a charge recombination, which is attributable to the fewer CH₃NH₃PbI₃ crystal boundaries and band structure of BaTiO₃/TiO₂ MDL. The results suggest that using BaTiO₃ as the second layer of the TiO₂ mesoporous layer is a promising way to boost the performance of perovskite solar cells.