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Organometal halide perovskite solar cells have demonstrated high conversion efficiency but poor long-term stability against ultraviolet irradiation and water. We show that rapid light-induced free-radical polymerization at ambient temperature produces multifunctional fluorinated photopolymer coatings that confer luminescent and easy-cleaning features on the front side of the devices, while concurrently forming a strongly hydrophobic barrier toward environmental moisture on the back contact side. The luminescent photopolymers re-emit ultraviolet light in the visible range, boosting perovskite solar cells efficiency to nearly 19% under standard illumination. Coated devices reproducibly retain their full functional performance during prolonged operation, even after a series of severe aging tests carried out for more than 6 months.
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Paul Joseph Dyson, Farzaneh Fadaei Tirani, Zhaofu Fei, Peng Gao, Yonghui Lee, Mohammad Khaja Nazeeruddin, Rosario Scopelliti, Yi Zhang
Ulf Anders Hagfeldt, Hui-Seon Kim, Monica Marcela Lira Cantu, Anna Morales Melgares, Michael Saliba, Silver Hamill Turren Cruz, Zaiwei Wang, Haibing Xie, Shaik Mohammed Zakeeruddin