Corrigendum to “The mechanical behavior of metal-halide perovskites: Elasticity, plasticity, fracture, and creep” [Scripta Materialia 223 (2023) 115064] (Scripta Materialia (2023) 223, (S1359646222005590), (10.1016/j.scriptamat.2022.115064))

The authors have discovered that the Vickers micro-indenter and the optical microscope used to measure the hardness (H) and the fracture toughness (K_IC) were not correctly calibrated. This affects only the reported Vickers indentation H and K_IC values. These instruments have now been correctly calibrated, and the correct H and K_IC values are included in the corrected versions of the abstract, graphical abstract, Table 2, Fig. 2, and last summary paragraph below. The calculated value of cohesion toughness (G_C), which depends on K_IC, has also changed. The corrected relevant sentences on page 3 of the original article are also included. The other test and results are not affected. The overall conclusions about extreme softness and brittleness of these materials remain unchanged. Corrected 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 microhardness H(100) of MAPbBr₃ and MAPbI₃ is 0.15 ± 0.01 GPa and 0.27 ± 0.02 GPa, respectively. The Vickers micro-indentation fracture toughness K_IC of MAPbBr₃ and MAPbI₃ is estimated at 0.11 ± 0.01 MPa⋅m^0.5 and 0.14 ± 0.03 MPa⋅m^0.5, 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. Corrected Graphical Abstract [Formula presented] Corrected Table 2 Corrected Fig. 2 Corrected Last Summary Paragraph In summary, accurate measurements of relevant mechanical properties of MHPs are critically important for analyzing mechanical reliability of PSCs in the future. To that end, elasticity, plasticity, fracture, and creep behaviors in MAPbBr₃ and MAPbI₃ bulk single-crystals are systematically studied. We have directly measured the Young's modulus E<100> of MAPbBr₃ and MAPbI₃ using bulk uniaxial compression, which is 13.1 ± 1.3 and 10.6 ± 1.0 GPa, respectively. The Vickers microhardness H(100) of MAPbBr₃ and MAPbI₃ is 0.15 ± 0.01 GPa and 0.27 ± 0.02 GPa, respectively. The Vickers micro-indentation fracture toughness K_IC of MAPbBr₃ and MAPbI₃ is estimated at 0.11 ± 0.01 MPa⋅m^0.5 and 0.14 ± 0.03 MPa⋅m^0.5, respectively. The stress-exponent, n, extracted from the nanoindentation creep data is ∼8 and ∼10 for MAPbBr₃ and MAPbI₃, respectively. All these properties are best estimates and are recommended for use in future mechanical reliability analyses of MHPs and PSCs. Corrected Sentences on Page 3 The cohesion toughness can also be expressed in terms of energy (plane stress), G_C=K_IC²/E, which for MAPbBr₃ and MAPbI₃ is 0.92 J⋅m² and 1.85 J⋅m², respectively. Since the fracture of these highly brittle materials, which lack any intrinsic or extrinsic toughening mechanisms as defined by Ritchie [43], is entirely governed by surface energies, it appears that the specific surface energy (γ_S=G_C/2) of MAPbBr₃ and MAPbI₃ is ∼0.46 J⋅m² and ∼0.93 J⋅m², respectively. The authors apologise for any inconvenience caused.