The mechanical behavior of metal-halide perovskites: Elasticity, plasticity, fracture, and creep

被引：36

作者：

Dai, Zhenghong ^{[1
]}

Doyle, Meaghan C. ^{[1
]}

Liu, Xing ^{[1
]}

Hu, Mingyu ^{[1
]}

Wang, Qizhong ^{[1
]}

Athanasiou, Christos E. ^{[1
]}

Liu, Yucheng ^{[2
]}

Sheldon, Brian W. ^{[1
]}

Gao, Huajian ^{[1
,3
,4
]}

Liu, Shengzhong ^{[2
]}

Padture, Nitin P. ^{[1
]}

机构：

[1] Brown Univ, Sch Engn, Providence, RI 02912 USA

[2] Shaanxi Normal Univ, Sch Mat Sci & Engn, Xian 710119, Peoples R China

[3] Nanyang Technol Univ, Coll Engn, Sch Mech & Aerosp Engn, Singapore 639798, Singapore

[4] ASTAR, Inst High Performance Comp, Singapore 138632, Singapore

来源：

SCRIPTA MATERIALIA | 2023年 / 223卷

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

Halide perovskites; Mechanical behavior; Elastic modulus; Hardness; Fracture toughness; Creep; NANOINDENTATION; TOUGHNESS; STABILITY; HARDNESS;

D O I：

10.1016/j.scriptamat.2022.115064

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

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 (MAPbBr(3)) and CH3NH3PbI3 (MAPbI(3)). The first direct measurement of MHP Young's modulus (E) using uniaxial compression reveals E-<100> of 13.1 +/- 1.3 and 10.6 +/- 1.0 GPa for MAPbBr(3) and MAPbI(3), respectively. The Vickers micro-hardness H(100) of MAPbBr(3) and MAPbI(3) is 0.54 +/- 0.02 GPa and 0.76 +/- 0.05 GPa, respectively. The Vickers micro-indentation fracture toughness KIC of MAPbBr(3) and MAPbI(3) is estimated at 0.20 +/- 0.03 MPa.m(0.5) and 0.18 +/- 0.03 MPa.m(0.5), respectively. The stress-exponent, n, extracted from nanoindentation creep data is similar to 8 and similar to 10 for MAPbBr(3) and MAPbI(3), 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.

引用

页数：6

共 51 条

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