Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.051
Publication date: 23rd September 2021
Here I will give insight into the uniqueness and challenges of charge transport in halide perovskites. Despite the tremendous efforts in the study of their electric properties, the free carriers - defects interactions and some critical defect properties are still unclear in methylammonium lead halide perovskites (MHPs). Here we use a multi-method approach to quantify and characterize defects in single crystal MAPbI3 giving a cross-checked overview of their properties. Time of Flight current waveform spectroscopy (ToF CWF) reveals the interaction of carriers with five shallow and deep defects. Photo Hall (PHES) and Thermoelectric effect spectroscopy (TEES) assess the defect density, cross-section, and relative (to the valence band) energy. The detailed reconstruction of free carrier relaxation through Monte Carlo (MC) simulation allow quantifying the lifetime, mobility, and diffusion length of hole and electron separately. We demonstrate that the dominant part of defects releases free carriers after trapping; this happens without non-radiative recombination with consequent positive effects on the photoconversion and charge transport properties. On the other hand, shallow traps decrease the drift mobility sensibly. Our results provide a trustworthy picture for future consideration on the defect properties in MAPbI3 thanks to the verification of our statements with multiple methods. Our results will be key for the optimization of the charge transport properties and defects in MHP and will contribute to the research aiming to improve their stability[1].
A. M. acknowledges financial support from the German Science Foundation (DFG) in the framework of the priority program SPP 2196.
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