Yevgeny Rakita

The remarkable optoelectronic and especially photovoltaic performance of hybrid organic-inorganic perovskite (HOIP) materials drives efforts to connect materials properties to this performance. From nano-indentation experiments on solution-grown single crystals we obtain elastic modulus and nano-hardness values of APbX 3 (A = Cs, CH₃NH₃; X = I, Br). The Young's moduli are ∼14, 19.5, and 16 GPa, for CH₃NH₃PbI₃, CH₃NH₃PbBr₃, and CsPbBr₃, respectively, lending credence to theoretically calculated values. We discuss the possible relevance of our results to suggested self-healing, ion diffusion, and ease of manufacturing. Using our results, together with literature data on elastic moduli, we classified HOIPs amongst the relevant material groups, based on their elastomechanical properties.