Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.133
Publication date: 18th July 2019
Since the introduction of the perovskite compound methylammonium lead iodide (MAPbI3) as absorber material for photovoltaic (PV) devices in 2009,[1] studies continue to reveal fascinating material properties, including switchable ferroelastic twin domains. [2, 3, 4] However, the relation between a structural phenomenon like crystal twins and the electronic transport properties in the PV absorber remains unclear. Here, we present the results of a correlative piezoresponse force microscopy and photoluminescence study aiming to resolve whether and how twin domains influence the photocarrier diffusion in micrometer-sized MAPbI3 crystallites. We observed a distinct anisotropy in the photocarrier diffusion times that correlates to the arrangement of the twin domains, with a faster diffusion parallel to the domains and a slower diffusion perpendicular to the domains. This anisotropy could originate from domain walls acting as energy sinks or barriers for electronic charges, which leads to favorable diffusion times parallel to the domain structure. In combination with the switchability of the domains under mechanical stress, this anisotropic charge carrier diffusion promises the improvement of charge transport in MAPbI3 for PV and other optoelectronic applications via controlled crystal growth and strain engineering.
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