Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.206
Publication date: 23rd September 2021
Ferroelastic twin domains are a crystallography related mechanism that affects the charge carrier Dynamics in methylammonium lead iodide (MAPI) crystals. In this work, we have found a chemical route to manipulate the ferroelastic twin domain structure in MAPI thin films by changing the Pb(Ac)2 / PbCl2 ratio in the perovskite precursor solution. The ferroelastic twin domain structure of each sample was monitored via piezoresponse force microscopy (PFM) and x-ray diffraction spectroscopy (XRD). Furthermore, we have shown that the changes in ferroelastic twin domains directly affects the charge carrier lifetimes via time-resolved photoluminescence (TRPL). Therefore, this chemical engineering route we have discovered offers a new way of strain engineering in perovskite research.
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