Efficient Perovskite Solar Cells Depending on TiO2 Nanorod Arrays

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• 作者：Xin Li ; Si-Min Dai ; Pei Zhu ; Lin-Long Deng ; Su-Yuan Xie ; Qian Cui ; Hong Chen ; Ning Wang ; Hong Lin
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：August 24, 2016
• 年：2016
• 卷：8
• 期：33
• 页码：21358-21365
• 全文大小：444K
• 年卷期：0
• ISSN：1944-8252

文摘

Perovskite solar cells (PSCs) with TiO₂ materials have attracted much attention due to their high photovoltaic performance. Aligned TiO₂ nanorods have long been used for potential application in highly efficient perovskite solar cells, but the previously reported efficiencies of perovskite solar cells based on TiO₂ nanorod arrays were underrated. Here we show a solvothermal method based on a modified ketone–HCl system with the addition of organic acids suitable for modulation of the TiO₂ nanorod array films to fabricate highly efficient perovskite solar cells. Photovoltaic measurements indicated that efficient nanorod-structured perovskite solar cells can be achieved with the length of the nanorods as long as approximately 200 nm. A record efficiency of 18.22% under the reverse scan direction has been optimized by avoiding direct contact between the TiO₂ nanorods and the hole transport materials, eliminating the organic residues on the nanorod surfaces using UV–ozone treatment and tuning the nanorod array morphologies through addition of different organic acids in the solvothermal process.