Theoretical investigation of the mechanical properties of single- and multi-layer CH₃NH₃XI₃ (X = Pb, Sn, Mn) perovskites at various temperatures and pressures

Abstract

The mechanical qualities of single – and multi-layer CH₃NH₃XI₃ (X = Pb, Sn, Mn) perovskite structures have been computed using the LAMMPS programme via the molecular dynamics’ method. The LAMMPS analysis code is the keystone for computing mechanical characteristics in simulations. The stress–strain curves of the simulated atomic structures are offered for tests in the X and Y directions. The stress–strain curves were significantly computed by employing the loading technique and the deform command during the computational tests. Mechanical data was retrieved by inducing deformation in the simulated structures. The stress–strain curves for the single – (SL) and the multi-layer (ML) CH₃NH₃XI₃ at various temperature and pressure values in the X and Y directions were also produced and compared, after applying a maximum stress (ultimate strength) using a load. Molecular dynamics (MD) simulations using LAMMPS software showed that layered perovskite materials possess high flexibility compared to the non-layered perovskite materials, which is essential in perovskite solar cells. The studied atomic structures thus provided the significant mechanical properties for designing proficient perovskite solar cells via the MD simulation.

GRAPHICAL ABSTRACT

KEYWORDS:

• CH₃NH₃XI₃
• molecular dynamics
• stress–strain
• ultimate strength

Disclosure statement

No potential conflict of interest was reported by the author(s).