Open AccessСпектры пропускания монокристаллов гибридных перовскитов MAPbI-=SUB=-3-=/SUB=- вблизи края фундаментального поглощения
Author(s) -
В.Е. Аникеева,
К.Н. Болдырев,
О.И. Семенова,
М.Н. Попова
Publication year - 2022
Publication title -
optika i spektroskopiâ
Language(s) - English
Resource type - Journals
eISSN - 2782-6694
pISSN - 0030-4034
DOI - 10.21883/os.2022.01.51898.21-21
Subject(s) - tetragonal crystal system , absorption edge , orthorhombic crystal system , materials science , hysteresis , absorption (acoustics) , phase transition , attenuation coefficient , phase (matter) , perovskite (structure) , atmospheric temperature range , single crystal , crystal (programming language) , absorption spectroscopy , photon energy , analytical chemistry (journal) , condensed matter physics , diffraction , optics , crystallography , chemistry , band gap , photon , optoelectronics , physics , thermodynamics , programming language , organic chemistry , chromatography , computer science , composite material
The paper presents the transmission spectra of hybrid perovskite MAPbI3 single crystals near the fundamental absorption edge in a wide temperature range. The absorption coefficient α of the single crystal samples is estimated at a temperature T = 150 K for the light with a photon energy E = 1.6 eV and at T = 40 K for E = 1.8 eV. The obtained values turned out to be several orders of magnitude smaller than the values of α for thin-film samples known from the literature. A sharp shift of the fundamental absorption edge by ~ 100 meV was observed at a temperature T1 = 160 K of the structural phase transition from the tetragonal to the orthorhombic phase. The temperature hysteresis of the shift of the fundamental absorption edge near T1 was recorded, which is characteristic of a first-order phase transition.