Low-Temperature TiOx Compact Layer for Planar Heterojunction Perovskite Solar Cells

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• 作者：Zonghao Liu ; Qi Chen ; Ziruo Hong ; Huanping Zhou ; Xiaobao Xu ; Nicholas De Marco ; Pengyu Sun ; Zhixin Zhao ; Yi-Bing Cheng ; Yang Yang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：May 4, 2016
• 年：2016
• 卷：8
• 期：17
• 页码：11076-11083
• 全文大小：578K
• 年卷期：0
• ISSN：1944-8252

文摘

Here, we demonstrate an effective low-temperature approach to fabricate a uniform and pinhole-free compact TiO₂ layer for enhancing photovoltaic performance of perovskite solar cells. TiCl₄ was used to modify TiO₂ for efficient charge generation and significantly reduced recombination loss. We found that a TiO₂ layer with an appropriate TiCl₄ treatment possesses a smooth surface with full coverage of the conductive electrode. Further studies on charge carrier dynamics confirmed that the TiCl₄ treatment improves the contact of the TiO₂/perovskite interface, facilitating charge extraction and suppressing charge recombination. On the basis of the treatment, we improved the open circuit voltage from 1.01 V of the reference cell to 1.08 V, and achieved a power conversion efficiency of 16.4%.