Impacts of Heterogeneous TiO2 and Al2O3 Composite Mesoporous Scaffold on Formamidinium Lead Trihalide Perovskite Solar Cells

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• 作者：Youhei Numata ; Yoshitaka Sanehira ; Tsutomu Miyasaka
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：February 24, 2016
• 年：2016
• 卷：8
• 期：7
• 页码：4608-4615
• 全文大小：647K
• ISSN：1944-8252

文摘

Heterogeneous TiO₂ and Al₂O₃ composites were employed as a mesoporous scaffold in formamidinium lead trihalide (FAPbI_3–xCl_x)-based perovskite solar cells to modify surface properties of a mesoporous layer. It was found that the quality and morphology of the perovskite film were strongly affected by the TiO₂/Al₂O₃ ratio in the mesoporous film. The conversion efficiency of the perovskite solar cell was improved by using a composite of TiO₂ and Al₂O₃ in comparison with TiO₂- and Al₂O₃-based cells, yielding 11.0% for a cell with a 7:3 TiO₂/Al₂O₃ composite. Our investigation shows a change of electron transport path depending on a composition ratio of insulating Al₂O₃ to n-type semiconducting TiO₂ in a mesoporous layer.