High Efficiency and Stable Cs based Perovskite Solar Cells
Yixin Zhao a, Xingtao Wang a, Xiaomin Liu a, Yong Wang a, Taiyang Zhang a
a School of Environmental Science and Engineering, Shanghai Jiao Tong University
Proceedings of International Online Conference on Hybrid Materials and Optoelectronic Devices (HYBRIDOE21)
Online, Spain, 2021 December 15th - 17th
Organizers: Jinwei Gao, Hua Yu, Dewei Zhao, Haizheng Zhong, Hairen Tan and Xueqing Xu
Invited Speaker, Yixin Zhao, presentation 025
DOI: https://doi.org/10.29363/nanoge.hybridoe.2021.025
Publication date: 3rd December 2021

With the unprecedent efficiency progress, perovskite solar cells have become one of most promising next-generation photovoltaics technologies to realize the goal of low cost and high efficiency. However, their commercialization faces the challenge of stability. Various technologies have been developed to enhance the stability of perovskite solar cell without decreasing efficiency. The Cs based perovskites are one of the most promising ones. The Cs based FA-Cs with tunable tolerant factor and high stability are promising choice to realize high efficiency and stability. However, the crystallization of FA-Cs perovskite face the serious challenge of phase segregation. We develop the MA and DMA cation induced crystallization of phase pure FA-Cs mixed cation perovskite solar cell, which exhibiting both the high efficiency and high stability. Furthermore. the all-inorganic lead halide perovskite without volatile component would be a promising alternative candidate for high efficiency photovoltaics. However, the all inorganic CsPbI3 with most suitable band gap face the challenges of low room temperature phase stability and relative low efficiency. To enhance the performance and stability of all-inorganic CsPbI3 perovskite, the 2D/3D configuration especially the (110) oriented 2D perovskite component was introduced to stabilize the black phase CsPbI3. Later, facile organic cation surface termination approach was developed to significantly enhance the stability and performance of black phase CsPbI3 solar cell with >15% efficiency. The bifunctional stabilization of CsPbI3 with gradient Br doping and organic cation termination finally improve the efficiency of CsPbI3 perovskite solar cells to a value of 17% with enhanced stabilities. With crystallization dynamics control, we developed a highly stable and efficient beta-phase CsPbI3 with impressing efficiency up to 18%. Recently, with more passivation approaches, we push the inorganic perovskties’ efficiencies approaching 20%.

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