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Mechanical properties of APbX3 (A = Cs or CH3NH3; X = I or Br) perovskite single crystals

Published online by Cambridge University Press:  06 October 2015

Yevgeny Rakita ,
Sidney R. Cohen ,
Nir Klein Kedem ,
Gary Hodes  and
David Cahen
Yevgeny Rakita
Affiliation:
Materials and Interfaces Department, Weizmann Institute of Science, Rehovot 76100, Israel
Sidney R. Cohen*
Affiliation:
Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 76100, Israel
Nir Klein Kedem
Affiliation:
Materials and Interfaces Department, Weizmann Institute of Science, Rehovot 76100, Israel
Gary Hodes
Affiliation:
Materials and Interfaces Department, Weizmann Institute of Science, Rehovot 76100, Israel
David Cahen*
Affiliation:
Materials and Interfaces Department, Weizmann Institute of Science, Rehovot 76100, Israel
*
Address all correspondence to Sidney R. Cohen at[email protected]and David Cahen at[email protected]
Address all correspondence to Sidney R. Cohen at[email protected]and David Cahen at[email protected]
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Abstract

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 APbX3 (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.

Type
Research Letters
Information
MRS Communications , Volume 5 , Issue 4 , December 2015 , pp. 623 - 629
Copyright
Copyright © Materials Research Society 2015 

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