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The remarkable optoelectronic, and especially photovoltaic performance ofhybrid-organic-inorganic perovskite (HOIP) materials drives efforts to connectmaterials properties to this performance. From nano-indentation experiments onsolution-grown single crystals we obtain elastic modulus and nano-hardnessvalues of APbX3 (A = Cs, CH3NH3 and X = I, Br). The Youngs moduli are about 14,19.5 and 16 GPa, for CH3NH3PbI3, CH3NH3PbBr3 and CsPbBr3, respectively, lendingcredence to theoretically calculated values. We discuss possible relevance ofour results to suggested self-healing, ion diffusion and ease of manufacturing.Using our results, together with literature data on elastic moduli, weclassified HOIPs amongst relevant materials groups, based on theirelasto-mechanical properties.

Mechanical Properties of APbX3 (A=Cs or CH3NH3; X=I or Br) Perovskite Single Crystals