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

Zhenghong Dai, Meaghan C. Doyle, Xing Liu, Mingyu Hu, Qizhong Wang, Christos E. Athanasiou, Yucheng Liu, Brian W. Sheldon, Huajian Gao, Shengzhong (Frank) Liu, Nitin P. Padture*

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

9 Citations (Scopus)

Abstract

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 reveals E<100> of 13.1 ± 1.3 and 10.6 ± 1.0 GPa for MAPbBr3 and MAPbI3, respectively. The Vickers micro-hardness H(100) of MAPbBr3 and MAPbI3 is 0.54 ± 0.02 GPa and 0.76 ± 0.05 GPa, respectively. The Vickers micro-indentation fracture toughness KIC of MAPbBr3 and MAPbI3 is estimated at 0.20 ± 0.03 MPa⋅m0.5 and 0.18 ± 0.03 MPa⋅m0.5, respectively. The stress-exponent, n, extracted from nanoindentation creep data is ∼8 and ∼10 for MAPbBr3 and 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.

Original languageEnglish
Article number115064
Number of pages16
JournalScripta Materialia
Volume223
Early online date28 Sept 2022
DOIs
Publication statusPublished - 15 Jan 2023

Scopus Subject Areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

User-Defined Keywords

  • Creep
  • Elastic modulus
  • Fracture toughness
  • Halide perovskites
  • Hardness
  • Mechanical behavior

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