Effect of Grain Size on the Fracture Behavior of Organic-Inorganic Halide Perovskite Thin Films for Solar Cells
Effect of Grain Size on the Fracture Behavior of Organic-Inorganic Halide Perovskite Thin Films for Solar Cells
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DOI：
10.1016/j.scriptamat.2020.03.044
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发表时间：
2020-08-01
影响因子：
6
通讯作者：
Padture, Nitin P.
中科院分区：
文献类型：
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作者：
Dai, Zhenghong;Yadavalli, Srinivas K.;Padture, Nitin P.
新型钙钛矿太阳能电池（PSC）核心的有机-无机卤化物钙钛矿（OIHP）薄膜非常脆，限制了PSC的机械可靠性。在这里，我们表明，晶粒尺寸（类似于290 nm）小于典型的膜厚度（类似于500 nm）的细晶粒MAPbI（3）（原型OIHP）膜倾向于在晶粒间断裂，导致低韧性（0.41 J.m（-2））。相比之下，MAPbI（3）/衬底界面断裂发生在晶粒大于膜厚度（类似于730 nm）的膜中，导致高得多的韧性（1.14 J.m（-2））。因此，认为粗晶粒的OIHP膜不仅对于改进的PSC性能和稳定性而且对于机械可靠性都是期望的。(C)2020 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Organic-inorganic halide perovskite (OIHP) thin films at the heart of the new perovskite solar cells (PSCs) are very brittle, limiting the mechanical reliability of PSCs. Here we show that fine-grained MAPbI(3) (prototypical OIHP) films with grain size (similar to 290 nm) smaller than the typical film thickness (similar to 500 nm) tend to fracture intergranularly, resulting in low toughness (0.41 J.m(-2)). In contrast, MAPbI(3) /substrate interfacial fracture occurs in films with grains larger (similar to 730 nm) than the film thickness, resulting in much higher toughness (1.14 J.m(-2)). Thus, coarse-grained OIHP films are deemed desirable for not only improved PSCs performance and stability but also mechanical reliability. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.