Spatial localization of defects in halide perovskites using photothermal deflection spectroscopy

0583027 - FZÚ 2025 RIV US eng J - Journal Article
Vlk, Aleš - Remeš, Zdeněk - Landová, Lucie - Ridzoňová, Katarína - Hlaváč, Robert - Fejfar, Antonín - Ledinský, Martin
Spatial localization of defects in halide perovskites using photothermal deflection spectroscopy.
Journal of Physical Chemistry Letters. Roč. 15, č. 5 (2024), s. 1273-1278. ISSN 1948-7185
R&D Projects: GA MŠMT(CZ) LUASK22202; GA MŠMT LM2018110
Institutional support: RVO:68378271
Keywords : bulk defects * surface defects * photothermal deflection spectroscopy * Urbach energy
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 5.7, year: 2022
Method of publishing: Open access

Photothermal deflection spectroscopy (PDS) emerges as a highly sensitive noncontact technique for measuring absorption spectra and serves for studying defect states within semiconductor thin films. In our study, we applied PDS to methyl-ammonium lead bromide single crystals. By analyzing the frequency dependence of the PDS spectra and the phase difference of the signal, we can differentiate between surface and bulk deep defect absorption states. This methodology allowed us to investigate the effects of bismuth doping and light-induced degradation. The identified absorption states are attributed to MA+ vibrational states and structural defects, and their influence on the nonradiative recombination probability is discussed. This distinction significantly enhances our capability to characterize and analyze perovskite materials at a deeper level.
Permanent Link: https://hdl.handle.net/11104/0352932