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Defects in Hybrid Perovskites: The Secret of Efficient Charge Transport
Author(s) -
Musiienko Artem,
Ceratti Davide Raffaele,
Pipek Jindřich,
Brynza Mykola,
Elhadidy Hassan,
Belas Eduard,
Betušiak Marián,
Delport Geraud,
Praus Petr
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202104467
Subject(s) - materials science , charge carrier , perovskite (structure) , chemical physics , electron mobility , doping , carrier lifetime , relaxation (psychology) , optoelectronics , diffusion , electron , condensed matter physics , silicon , chemistry , physics , crystallography , psychology , social psychology , quantum mechanics , thermodynamics
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.