Similar Structural Dynamics for the Degradation of CH3 NH3 PbI3 in Air and in Vacuum

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Alessandra AlbertiAntonino La Magna

Abstract

We investigate the degradation path of MAPbI3 (MA=methylammonium) films over flat TiO2 substrates at room temperature by means of X-ray diffraction, spectroscopic ellipsometry, X-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. The degradation dynamics is found to be similar in air and under vacuum conditions, which leads to the conclusion that the occurrence of intrinsic thermodynamic mechanisms is not necessarily linked to humidity. The process has an early stage, which drives the starting tetragonal lattice in the direction of a cubic atomic arrangement. This early stage is followed by a phase change towards PbI2 . We describe how this degradation product is structurally coupled with the original MAPbI3 lattice through the orientation of its constituent PbI6 octahedra. Our results suggest a slight octahedral rearrangement after volatilization of HI+CH3 NH2 or MAI, with a relatively low energy cost. Our experiments also clarify why reducing the interfaces and internal defects in the perovskite lattice enhances the stability of the material.

References

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Citations

Apr 29, 2016·Physical Chemistry Chemical Physics : PCCP·Emanuele SmeccaAlessandra Alberti
Jun 21, 2016·Journal of the American Chemical Society·Jacob B HoffmanPrashant V Kamat
Jun 30, 2016·Angewandte Chemie·Aleksandar R MilosavljevićSylwia Ptasinska
Feb 1, 2017·ACS Applied Materials & Interfaces·Sheng ChenAnita Ho-Baillie
Aug 24, 2017·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Zhen SongJun Mei
Nov 21, 2017·Advanced Materials·Felix LangNorbert H Nickel
Oct 2, 2017·The Journal of Chemical Physics·Yuanbin XueHu Xu
May 18, 2019·Nature Communications·Alessandra AlbertiCorrado Spinella
Mar 3, 2020·Frontiers in Chemistry·Yvonne J HofstetterYana Vaynzof
Jul 31, 2018·The Journal of Physical Chemistry Letters·Congcong Wang, Yongli Gao
Jan 13, 2018·ACS Applied Materials & Interfaces·Wanliang TanPaul C McIntyre
Jun 15, 2018·The Journal of Physical Chemistry Letters·Andrea Ciccioli, Alessandro Latini
Mar 2, 2019·Chemical Reviews·Philip SchulzAntoine Kahn
May 16, 2018·The Journal of Physical Chemistry Letters·Ioannis DeretzisAlessandra Alberti

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