Modulation of perovskite degradation with multiple-barrier for light-heat stable perovskite solar cells
Jing Zhou, Zonghao Liu, Yu Peng, Guoqing Tong, Ruijun Chen, Luis K. Ono, Rui Chen, Haixin Wang, Fumeng Ren, Sanwan Liu, Jianan Wang, Zhigao Lan, Yabing Qi, Wei Chen
Abstract
Abstract The long-term stability of perovskite solar cells remains one of the most important challenges for the commercialization of this emerging photovoltaic technology. Here, we adopt a non-noble metal/metal oxide/polymer multiple-barrier to suppress the halide consumption and gaseous perovskite decomposition products release with the chemically inert bismuth electrode and Al 2 O 3 /parylene thin-film encapsulation, as well as the tightly closed system created by the multiple-barrier to jointly suppress the degradation of perovskite solar cells, allowing the corresponding decomposition reactions to reach benign equilibria. The resulting encapsulated formamidinium cesium-based perovskite solar cells with multiple-barrier maintain 90% of their initial efficiencies after continuous operation at 45 °C for 5200 h and 93% of their initial efficiency after continuous operation at 75 °C for 1000 h under 1 sun equivalent white-light LED illumination.