Photophysical Ion Dynamics in Hybrid Perovskite MAPbX3 (X=Br, Cl) Single Crystals
Journal article, 2024
Hybrid organic-inorganic perovskites (HOIPs) are promising candidates for next-generation photovoltaic materials. However, there is a debate regarding the impact of interactions between the organic center and the surrounding inorganic cage on the solar cell's high diffusion lengths. It remains unclear whether the diffusion mechanism is consistent across various halide perovskite families and how light illumination affects carrier lifetimes. The focus is on ion kinetics of (CH3NH3)PbX3 (X = Br, Cl) perovskite halide single crystals. Muon spectroscopy (mu+SR)is employed to investigate the fluctuations and diffusion of ions via the relaxation of muon spins in local nuclear field environments. Within a temperature range of 30-340 K, ion kinetics are studied with and without white-light illumination. The results show a temperature shift of the tetragonal-orthorhombic phase transition on the illuminated samples, as an effect of increased organic molecule fluctuations. This relation is supported by density functional theory (DFT) calculations along the reduction of the nuclear field distribution width between the phase transitions. The analysis shows that, depending on the halide ion, the motional narrowing from H and N nuclear moments represents the molecular fluctuations. The results demonstrate the importance of the halide ion and the effect of illumination on the compound's structural stability and electronic properties.
organic-inorganic hybrid perovskite
structural stability
ion dynamics
muon spin spectroscopy
Author
Konstantinos Papadopoulos
Chalmers, Physics, Materials Physics
Ola Kenji Forslund
University of Zürich
Uppsala University
Stephen Cottrell
STFC Rutherford Appleton Laboratory
Koji Yokoyama
STFC Rutherford Appleton Laboratory
Pabitra K. Nayak
Tata Institute of Fundamental Research
Francoise Mystere Amombo Noa
Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry
Lars Öhrström
Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry
Elisabetta Nocerino
Paul Scherrer Institut
Stockholm University
Lars Börjesson
Chalmers, Physics, Materials Physics
Jun Sugiyama
Comprehensive Research Organization for Science and Society (CROSS)
Martin Mansson
Royal Institute of Technology (KTH)
Yasmine Sassa
Chalmers, Physics, Materials Physics
ADVANCED PHYSICS RESEARCH
2751-1200 (ISSN)
Vol. 3 3 2300120Realization of Novel Low‐Dimensional Skyrmion Systems
Swedish Research Council (VR) (2017-05078), 2019-06-01 -- 2021-12-31.
Subject Categories
Atom and Molecular Physics and Optics
Condensed Matter Physics
DOI
10.1002/apxr.202300120