Giant Rashba Splitting in CH3NH3PbBr3 Organic-Inorganic Perovskite

Journal article
(Original article)


Publication Details

Author(s): Niesner D, Wilhelm M, Levchuk I, Osvet A, Shrestha S, Batentschuk M, Brabec C, Fauster T
Journal: Physical Review Letters
Publication year: 2016
Volume: 117
Journal issue: 12
ISSN: 0031-9007
eISSN: 1079-7114
Language: English


Abstract


As they combine decent mobilities with extremely long carrier lifetimes, organic-inorganic perovskites open a whole new field in optoelectronics. Measurements of their underlying electronic structure, however, are still lacking. Using angle-resolved photoelectron spectroscopy, we measure the valence band dispersion of single-crystal CH3NH3PbBr3. The dispersion of the highest energy band is extracted applying a modified leading edge method, which accounts for the particular density of states of organic-inorganic perovskites. The surface Brillouin zone is consistent with bulk-terminated surfaces both in the low-temperature orthorhombic and the high-temperature cubic phase. In the low-temperature phase, we find a ring-shaped valence band maximum with a radius of 0.043 Å-1, centered around a 0.16 eV deep local minimum in the dispersion of the valence band at the high-symmetry point. Intense circular dichroism is observed. This dispersion is the result of strong spin-orbit coupling. Spin-orbit coupling is also present in the room-temperature phase. The coupling strength is one of the largest ones reported so far.



FAU Authors / FAU Editors

Batentschuk, Miroslaw PD Dr.-Ing.
Institute Materials for Electronics and Energy Technology (i-MEET)
Brabec, Christoph Prof. Dr.
Institute Materials for Electronics and Energy Technology (i-MEET)
Fauster, Thomas Prof. Dr.
Lehrstuhl für Festkörperphysik
Levchuk, Ievgen
Institute Materials for Electronics and Energy Technology (i-MEET)
Niesner, Daniel Dr.
Lehrstuhl für Festkörperphysik
Osvet, Andres Dr.
Institute Materials for Electronics and Energy Technology (i-MEET)
Shrestha, Shreetu
Institute Materials for Electronics and Energy Technology (i-MEET)


Additional Organisation
Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden
Exzellenz-Cluster Engineering of Advanced Materials
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)


Research Fields

Lead halide perovskites
Lehrstuhl für Festkörperphysik
B Nanoelectronic Materials
Exzellenz-Cluster Engineering of Advanced Materials


How to cite

APA:
Niesner, D., Wilhelm, M., Levchuk, I., Osvet, A., Shrestha, S., Batentschuk, M.,... Fauster, T. (2016). Giant Rashba Splitting in CH3NH3PbBr3 Organic-Inorganic Perovskite. Physical Review Letters, 117(12). https://dx.doi.org/10.1103/PhysRevLett.117.126401

MLA:
Niesner, Daniel, et al. "Giant Rashba Splitting in CH3NH3PbBr3 Organic-Inorganic Perovskite." Physical Review Letters 117.12 (2016).

BibTeX: 

Last updated on 2019-03-06 at 16:34