Strain in perovskite solar cells: origins,impacts and regulation |
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| Authors: | Jinpeng Wu Shun-Chang Liu Zongbao Li Shuo Wang Ding-Jiang Xue Yuan Lin Jin-Song Hu |
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| Institution: | Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;School of Material and Chemical Engineering, Tongren University, Tongren 554300, China |
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| Abstract: | Metal halide perovskite solar cells (PSCs) have seen an extremely rapid rise in power conversion efficiencies in the past few years. However, the commercialization of this class of emerging materials still faces serious challenges, one of which is the instability against external stimuli such as moisture, heat and irradiation. Much focus has deservedly been placed on understanding the different origins of intrinsic instability and thereby enhancing their stability. Among these, tensile strain in perovskite films is an important source of instability that cannot be overcome using conventionally extrinsic stabilization approaches such as encapsulation. Here we review recent progress in the understanding of the origin of strain in perovskites as well as its corresponding characterization methods, and their impacts on the physical properties of perovskites and the performance of PSCs including efficiency and stability. We then summarize the latest advances in strain-regulation strategies that improve the intrinsic stability of perovskites and photovoltaic devices. Finally, we provide a perspective on how to make further progress in stable and high-efficiency PSCs via strain engineering. |
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| Keywords: | perovskite stress strain stability solar cells |
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