Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
The free carrier interaction with defects and critical defect properties remain unclear in methylammonium lead halide perovskites despite tremendous efforts in the study of their electric properties. Here we use a multi-method approach to quantify defects in single crystal MAPbI3. Time of Flight current waveform spectroscopy reveals the interaction of carriers with five shallow and deep defects. Photo Hall [1] and Thermoelectric effect spectroscopy assess the defect density, cross-section, and relative (to the valence band) energy. The detailed reconstruction of free carrier relaxation through Monte Carlo simulation[2] allowed quantifying the lifetime, mobility, and diffusion length of hole and electron separately. We demonstrate that the dominant part of defects releases free chargers after trapping, without non-radiative recombination with expected positive effects on the photoconversion and charge transport properties. On the other hand, shallow traps decrease sensibly drift mobility. Our results provide a trustworthy picture for future consideration on the defect properties in MAPbI3 since their properties have been crosschecked with multiple methods, which showed full consistency. Our results will allow optimizing charge transport properties and defects in MHP and will help improve their stability. Also, we pave the way for doping and defect control, enhancing the scalability of perovskite devices with large diffusion lengths and lifetimes.
[1] A. Musiienko, P. Moravec, R. Grill, P. Praus, I. Vasylchenko, J. Pekarek, J. Tisdale, K. Ridzonova, E. Belas, L. Landová, B. Hu, E. Lukosi, M. Ahmadi, Deep levels, charge transport and mixed conductivity in organometallic halide perovskites. Energy Environ. Sci. 12, 1413–1425 (2019).
[2] A. Musiienko, J. Pipek, P. Praus, M. Brynza, E. Belas, B. Dryzhakov, M.-H. Du, M. Ahmadi, R. Grill, Deciphering the effect of traps on electronic charge transport properties of methylammonium lead tribromide perovskite. Sci. Adv. 6, 6393–6404 (2020).
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