The mechanical behavior of metal-halide perovskites: Elasticity, plasticity, fracture, and creep
The mechanical behavior of metal-halide perovskites: Elasticity, plasticity, fracture, and creep
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DOI：
10.1016/j.scriptamat.2022.115064
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发表时间：
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影响因子：
6
通讯作者：
Zhenghong Dai;Meaghan C. Doyle;Xing Liu;Mingyu Hu;Qizhong Wang;Christos E. Athanasiou;Yucheng Liu;B. Sheldon;Huajian Gao;S. Liu;N. Padture
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文献类型：
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作者：
Zhenghong Dai;Meaghan C. Doyle;Xing Liu;Mingyu Hu;Qizhong Wang;Christos E. Athanasiou;Yucheng Liu;B. Sheldon;Huajian Gao;S. Liu;N. Padture
广泛的机械性能-弹性，塑性，断裂和蠕变-最相关的钙钛矿太阳能电池（PSC）的机械可靠性进行了系统的研究。制备并研究了与PSC相关的通常研究的金属卤化物钙钛矿（MHP）的高质量块体单晶：CH 3 NH3 PbBr 3（MAPbBr 3）和CH 3 NH3 PbI 3（MAPbI 3）。使用单轴压缩的MHP杨氏模量（E）的首次直接测量显示<100>MAPbBr 3和MAPbI 3的E分别为13.1 ± 1.3和10.6 ± 1.0 GPa。MAPbBr 3和MAPbI 3的维氏显微硬度H（100）分别为0.54 ± 0.02GPa和0.76 ± 0.05GPa。MAPbBr 3和MAPbI 3的维氏显微压痕断裂韧性KIC分别为0.20 ± 0.03 MPa·m ~（0.5）和0.18 ± 0.03 MPa·m ~（0.5）。从纳米压痕蠕变数据中提取的MAPbBr 3和MAPbI 3的应力指数n分别为0.88和0.10。这些属性的趋势进行了讨论。这些性能是最佳估计，建议用于MHP和PSC的未来机械性能和可靠性分析。
Wide ranging mechanical properties — elasticity, plasticity, fracture, and creep — most relevant to the mechanical reliability of perovskite solar cells (PSCs) are systematically investigated. High quality bulk single-crystals of the commonly studied metal-halide perovskites (MHPs) relevant to PSCs are fabricated and studied: CH3NH3PbBr3(MAPbBr3) and CH3NH3PbI3(MAPbI3). The first direct measurement of MHP Young's modulus (E) using uniaxial compression revealsE<100>of 13.1 ± 1.3 and 10.6 ± 1.0 GPa for MAPbBr3and MAPbI3, respectively. The Vickers micro-hardnessH(100)of MAPbBr3and MAPbI3is 0.54 ± 0.02 GPa and 0.76 ± 0.05 GPa, respectively. The Vickers micro-indentation fracture toughnessKICof MAPbBr3and MAPbI3is estimated at 0.20 ± 0.03 MPa⋅m0.5and 0.18 ± 0.03 MPa⋅m0.5, respectively. The stress-exponent,n, extracted from nanoindentation creep data is ∼8 and ∼10 for MAPbBr3and MAPbI3, respectively. The trends in these properties are discussed. These properties are best estimates and are recommended for use in future mechanical behavior and reliability analyses of MHPs and PSCs.