Enhanced Stability of Perovskite Solar Cells with Low-Temperature Hydrothermally Grown SnO₂ Electron Transport Layers

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• 作者：Qin Liu ; Min-Chao Qin ; Wei-Jun Ke ; Xiao-Lu Zheng ; Zhao Chen ; Ping-Li Qin ; Liang-Bin Xiong ; Hong-Wei Lei ; Jia-Wei Wan ; Jian Wen ; Guang Yang ; Jun-Jie Ma ; Zhen-Yu Zhang and Guo-Jia Fang
• 刊名：Advanced Functional Materials
• 出版年：2016
• 出版时间：September 6, 2016
• 年：2016
• 卷：26
• 期：33
• 页码：6069-6075
• 全文大小：2082K
• ISSN：1616-3028

文摘

Perovskite solar cells (PSCs) may offer huge potential in photovoltaic conversion, yet their practical applications face one major obstacle: their low stability, or quick degradation of their initial efficiencies. Here, a new design scheme is presented to enhance the PSC stability by using low-temperature hydrothermally grown hierarchical nano-SnO₂ electron transport layers (ETLs). The ETL contains a thin compact SnO₂ layer underneath a mesoporous layer of SnO₂ nanosheets. The mesoporous layer plays multiple roles of enhancing photon collection, preventing moisture penetration and improving the long-term stability. Through such simple approaches, PSCs with power conversion efficiencies of ≈13% can be readily obtained, with the highest efficiency to be 16.17%. A prototypical PSC preserves 90% of its initial efficiency even after storage in air at room temperature for 130 d without encapsulation. This study demonstrates that hierarchical SnO₂ is a potential ETL for fabricating low-cost and efficient PSCs with long-term stability.