Solution-Processed Nb:SnO2 Electron Transport Layer for Efficient Planar Perovskite Solar Cells

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• 作者：Xiaodong Ren ; Dong Yang ; Zhou Yang ; Jiangshan Feng ; Xuejie Zhu ; Jinzhi Niu ; Yucheng Liu ; Wangen Zhao ; Shengzhong Frank Liu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：January 25, 2017
• 年：2017
• 卷：9
• 期：3
• 页码：2421-2429
• 全文大小：619K
• ISSN：1944-8252

文摘

Electron transport layer (ETL), facilitating charge carrier separation and electron extraction, is a key component in planar perovskite solar cells (PSCs). We developed an effective ETL using low-temperature solution-processed Nb-doped SnO₂ (Nb:SnO₂). Compared to the pristine SnO₂, the power conversion efficiency of PSCs based on Nb:SnO₂ ETL is raised to 17.57% from 15.13%. The splendid performance is attributed to the excellent optical and electronic properties of the Nb:SnO₂ material, such as smooth surface, high electron mobility, appropriate electrical conductivity, therefore making a better growth platform for a high quality perovskite absorber layer. Experimental analyses reveal that the Nb:SnO₂ ETL significantly enhances the electron extraction and effectively suppresses charge recombination, leading to improved solar cell performance.