Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
Publication date: 22nd December 2022
Both organic-inorganic and all-inorganic lead halide perovskites exhibit high energy-conversion efficiency, and defect tolerance, along with low charge carrier trapping, and low non-radiative recombination rates. Recently, many scientific groups have attributed such favorable electronic properties to phenomena such as Rashba and/or polaronic effects. In this work, we investigated the electronic band structure of two types of halide perovskites to verify these two generally accepted propositions.
A Rashba effect has been invoked to explain the high efficiency by prohibiting direct recombination. Particularly, in the valence band of MAPbBr3 a static Rashba effect was reported by angle-resolved photoemission and circular dichroism with giant values of 7 to 11 eVÅ. We present band dispersion measurements of MAPbBr3 and spin-resolved photoemission of CsPbBr3 to show that a large Rashba effect detectable by photoemission does not exist.
The formation of large polarons has also been proposed as the origin of excellent optoelectronic properties. Direct evidence for large-polaron formation was reported from a 50% effective mass enhancement in angle-resolved photoemission of topmost valence band of CsPbBr3 compared to the theoretically predicted mass. We present details of band dispersion measurements on CsPbBr3, combined with GW calculations to investigate the trace of large polarons. We argue that the effective mass can be explained solely on the basis of electron-electron correlation and large-polaron formation cannot be concluded from photoemission data.
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