发光学报2021，Vol.42Issue(9)：1396-1402,7.DOI:10.37188/CJL.20210195
Cs0.05FA0.79MA0.16PbI2.52Br0.48钙钛矿薄膜的变温光致发光特性
Temperature-dependent Photoluminescence Properties of Cs0 . 05 FA0 . 79 MA0 . 16 PbI2 . 52 Br0 . 48 Perovskite Thin Film
摘要
Abstract
This paper reports the temperature-dependent photoluminescence properties of Cs0. 05 FA0. 79 MA0. 16 PbI2. 52-Br0. 48 perovskite thin film. The Cs0. 05 FA0. 79 MA0. 16 PbI2. 52 Br0. 48 perovskite thin film was prepared by one-step spin coating with chlorobenzene anti-solvent treatment, and the surface morphology and crystallization quality were charac-terized. The X-ray diffraction( XRD) indicates that the Cs0. 05 FA0. 79 MA0. 16 PbI2. 52 Br0. 48 has a typical tetragonal perovs-kite structure. The perovskite film has a uniform and dense surface, and the grain size is about 300 nm. The photolu-minescence intensity was measured in the temperature range of 5 -200 K. The photoluminescence spectra show a continuous blue shift of about 9. 36 nm, and there is no reversal redshift induced by phase transition. The photolumi-nescence intensity shows a bi-exponential quenching with the increase of temperature, and two thermal activation en-ergies are obtained by Arrhenius equation. The optical bandgap is fitted by the Bose-Einstein double harmonic oscilla-tor model, and the non-renormalized bandgap energy, the energies of acoustic phonon and optical phonon were fitted. The photoluminescence broadening mechanism was studied by the Segall formula. At 10 K and 100 K, the photolumi-nescence is mainly from exciton recombination, while at 200 K, the radiation recombination is mainly from free-to-bound and donor-acceptor pairs, which means the defect associated photoluminescence arises at high temperature. The detailed optical parameters in our paper can provide a physical foundation for further optimization of perovskite optoelectronic devices.关键词
钙钛矿薄膜/变温光致发光/激子-声子相互作用Key words
perovskite thin film/photoluminescence/exciton-phonon interaction分类
数理科学引用本文复制引用
张琼,吴悦嘉,冯艳琴,孙立伟,戴俊..Cs0.05FA0.79MA0.16PbI2.52Br0.48钙钛矿薄膜的变温光致发光特性[J].发光学报,2021,42(9):1396-1402,7.基金项目
国家自然科学基金(11874185)资助项目 （11874185）
