Nanomechanical Approach for Flexibility of Organic-Inorganic Hybrid Perovskite Solar Cells

被引:53
作者
Ahn, Seung-min [1 ]
Jung, Eui Dae [1 ]
Kim, Si-Hoon [1 ]
Kim, Hangeul [1 ]
Lee, Sukbin [1 ]
Song, Myoung Hoon [1 ]
Kim, Ju-Young [1 ]
机构
[1] UNIST, Sch Mat Sci & Engn, UNIST Gil 50, Ulsan 44919, South Korea
基金
新加坡国家研究基金会;
关键词
Perovskite solar cells; flexibility; in situ tensile testing; elastic deformation limit; critical bending radius; HALIDE PEROVSKITES; EFFICIENT; STRENGTH;
D O I
10.1021/acs.nanolett.9b00796
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The mechanical flexibility of perovskite solar cells as well as high power conversion efficiency is attracting increasing attention. In addition to existing empirical approaches, such as cyclic bending tests, in this study we report the tensile properties of the perovskite materials themselves. Measuring the tensile properties of free-standing perovskite materials is critical because (1) tensile properties represent the realistic mechanical properties of the film-type perovskite layer in the solar cells including the effects of various defects, and (2) deformation behavior of the perovskite layer at any deformed state of the solar cells can be analyzed using solid mechanics with the tensile properties as input. Critical bending radius of MAPbI(3)-based flexible solar cells is found to be between 0.5 and 1.0 mm by the decrease in power conversion efficiency during cyclic bending deformation. This finding agrees well with the critical bending radius of 0.66 mm determined based on the elastic deformation limit of 1.17% for MAPbI(3) found by in situ tensile testing. Scanning electron microscopy observations and hole-nanoindentation tests suggest that the formation of coarse cracks in the perovskite layers is the primary cause of the decrease in power conversion efficiency observed in flexible perovskite solar cells.
引用
收藏
页码:3707 / 3715
页数:9
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