Highly Efficient Flexible Perovskite Solar Cells with Antireflection and Self-Cleaning Nanostructures.
Flexible thin film solar cells have attracted a great deal of attention as mobile power sources and key components for building-integrated photovoltaics, due to their light weight and flexible features in addition to compatibility with low-cost roll-to-roll fabrication processes. Among many thin film materials, organometallic perovskite materials are emerging as highly promising candidates for high efficiency thin film photovoltaics; however, the performance, scalability, and reliability of the flexible perovskite solar cells still have large room to improve. Herein, we report highly efficient, flexible perovskite solar cells fabricated on ultrathin flexible glasses. In such a device structure, the flexible glass substrate is highly transparent and robust, with low thermal expansion coefficient, and perovskite thin film was deposited with a thermal evaporation method that showed large-scale uniformity. In addition, a nanocone array antireflection film was attached to the front side of the glass substrate in order to improve the optical transmittance and to achieve a water-repelling effect at the same time. It was found that the fabricated solar cells have reasonable bendability, with 96% of the initial value remaining after 200 bending cycles, and the power conversion efficiency was improved from 12.06 to 13.14% by using the antireflection film, which also demonstrated excellent superhydrophobicity.
Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong SAR, China.
Mohammad Mahdi
MM
Tavakoli
Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong SAR, China.
Kwong-Hoi
KH
Tsui
Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong SAR, China.
Qianpeng
Q
Zhang
Peking University, Shenzhen SOC Key Laboratory, PKU-HKUST Shenzhen-Hong Kong Institutions , Shenzhen 518051, China.
Jin
J
He
Department of Electrical and Computer Engineering, University of Houston , Houston, Texas 77204, United States.
Yan
Y
Yao
Shanghai Advanced Research Institute, Chinese Academy of Sciences , 99 Haike Road, Zhangjiang Hi-Tech Park, Pudong, Shanghai 201210, China.
Dongdong
D
Li
Department of Electronic and Computer Engineering, Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong SAR, China.
Zhiyong
Z
Fan
antireflection layer; flexible glass; perovskite solar cell; superhydrophobicity; thermal evaporation