期刊
ADVANCED FUNCTIONAL MATERIALS
卷 31, 期 48, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202104467
关键词
charge transport; defects; halide perovskites; nature of defects; perovskites; perovskites stability; solar cells
类别
资金
- Grant Agency of the Czech Republic [P102/19/11920S]
- Grant Agency of Charles University [1234119]
- Ministry of Education, Youth, and Sports of the Czech Republic - National Program of Sustainability [NPU LO1305]
- German Science Foundation (DFG) [SPP 2196]
- Projekt DEAL
This study quantifies and characterizes defects in single crystal MAPbI(3) using a multi-method approach, revealing the interaction of carriers with different defects and their impact on charge transport properties in methylammonium lead halide perovskites. The results show that the dominant part of defects releases free carriers after trapping, leading to positive effects on photoconversion and charge transport, while shallow traps decrease drift mobility significantly. This research provides insights for optimizing charge transport properties and defects in MHP and contributes to improving perovskite stability.
The interaction of free carriers with defects and some critical defect properties are still unclear in methylammonium lead halide perovskites (MHPs). Here, a multi-method approach is used to quantify and characterize defects in single crystal MAPbI(3), giving a cross-checked overview of their properties. Time of flight current waveform spectroscopy reveals the interaction of carriers with five shallow and deep defects. Photo-Hall 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 allows for quantifying the lifetime, mobility, and diffusion length of holes and electrons separately. Here, it is demonstrated 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 drift mobility sensibly. The results are the key for the optimization of the charge transport properties and defects in MHP and contribute to the research aiming to improve perovskite stability. This study paves the way for doping and defect control, enhancing the scalability of perovskite devices with large diffusion lengths and lifetimes.
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