Temperature-dependent band structure evolution determined by surface geometry in organic halide perovskite single crystals

[Abstract] Organic halide perovskites have attracted much attention due to their potential applications in optoelectronic devices. Since the generally higher flexibility compared to their inorganic counterparts, their structures are prone to be more sensitive toward external effects, where the fundamental understanding of their band structure evolutions is still inconclusive. In this study, different electronic structure evolutions of perovskite single crystals are found via angle-resolved photoelectron spectroscopy: (i) Unchanged top valence band (VB) dispersions under different temperatures can be found in the CH3 NH3 PbI 3 . (ii) Phase transitions induced the evolution of top VB dispersions, and even a top VB splitting with Rashba effects can be observed in the CH3 NH3 PbBr 3 . Combined with low-energy electron diffraction, metastable atom electron spectroscopy, and density functional theory calculation, we confirm that different band structure evolutions observed in these two perovskite single crystals originated from the cleaved top surface layers, where the different surface geometries with CH3 NH3+-I in CH3 NH3 PbI 3 and Pb-Br in CH3 NH3 PbBr 3 are responsible for finding band dispersion change and appearance of the Rashba-type splitting. Such findings suggest that the top surface layer in organic halide perovskites should be carefully considered to create functional interfaces for developing perovskite devices.

https://opac.ll.chiba-u.jp/da/curator/900120911/

https://opac.ll.chiba-u.jp/da/curator/900120911/PhysRevB.102.245101.pdf

American Physical Society

学術雑誌論文

Physical Review B

102

24

245101

2020-12-01

10.1103/PhysRevB.102.245101

publisher

(c)2020 American Physical Society