Regensburg 2025 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 20: Poster I
HL 20.21: Poster
Tuesday, March 18, 2025, 10:00–12:30, P3
Photoluminescence and photophysical properties of halide perovskite MAPbBr3 single crystal — •Liangling Wang1,2, Francesco Vitale2, Edwin Eobaldt2, Thomas Alexander Zaunick2, and Carsten Ronning2 — 1School of Physics and Technology, University of Jinan, Jinan 250022, P. R. China — 2Institute of Solid State Physics, Friedrich-Schiller University Jena, Max-Wien-Platz 1, 07743 Jena, Germany
The remarkable optoelectronic properties of halide perovskite MAPbBr3 (MA=methylammonium), including near-unity photoluminescence quantum yield (PL QY), small full width at half-maximum (FWHM), tunable bandgap by mixing halide and defect tolerance, make it a compelling candidate material in solar cell, light emitting diodes (LED), photodetectors, X-ray imaging, and so on. The PL spectrum of MAPbBr3 at room temperature can be deconvoluted into two emission peaks. The major peak at 545 nm arises from band-to-band transition, while the lower energy peak at 560 nm is associated with recombination in trap states (Br vacancies) below the optical gap. Interestingly, PL enhancement of MAPbBr3 is found under certain laser irradiation, indicating that the surface defects are benefit charge carrier trapping and recombination. In order to verify the origin of the emission centers, power dependent PL, including both power increase and decrease processes, will be analyzed. Furthermore, thermal activation and excitonic effects of PL under different temperature from cryogenic temperature of liquid Helium to room temperature will be investigated.
Keywords: MAPbBr3; power dependent photoluminescence; temperature dependent photoluminescence; thermal activation