Efficient Planar Perovskite Solar Cells with Reduced Hysteresis and Enhanced Open Circuit Voltage by Using PW12–TiO2 as Electron Transport Layer

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• 作者：Chun Huang ; Canjun Liu ; Yunxiang Di ; Wenzhang Li ; Fangyang Liu ; Liangxing Jiang ; Jie Li ; Xiaojing Hao ; Haitao Huang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：April 6, 2016
• 年：2016
• 卷：8
• 期：13
• 页码：8520-8526
• 全文大小：445K
• ISSN：1944-8252

文摘

An electron transport layer is essential for effective operation of planar perovskite solar cells. In this Article, PW₁₂–TiO₂ composite was used as the electron transport layer for the planar perovskite solar cell in the device structure of fluorine-doped tin oxide (FTO)-glass/PW₁₂–TiO₂/perovskite/spiro-OMeTAD/Au. A proper downward shift of the conduction band minimum (CBM) enhanced electron extraction from the perovskite layer to the PW₁₂–TiO₂ composite layer. Consequently, the common hysteresis effect in TiO₂-based planar perovskite solar cells was significantly reduced and the open circuit voltage was greatly increased to about 1.1 V. Perovskite solar cells using the PW₁₂–TiO₂ compact layer showed an efficiency of 15.45%. This work can contribute to the studies on the electron transport layer and interface engineering for the further development of perovskite solar cells.