title: The Influence of Morphology and PbI2on the Intrinsic Trap State Distribution in Perovskite Films Determined by Using Temperature-Dependent Fluorescence Spectroscopy.
abstract: Perovskite films with different particle sizes and PbI2contents were prepared by using a controlled single or sequential method. By means of temperature-dependent fluorescence spectroscopy, the energetic distribution of intrinsic intragap trap states in perovskite was quantitatively determined, and the radiative charge recombinations through the band edge and via trap states were studied. Furthermore, a series of thermodynamic parameters, such as the demarcation energy between radiative and nonradiative recombination regions, detrapping activation energy, and characteristic temperature, were extracted based on which of the possible radiative and nonradiative recombination mechanisms were proposed. In addition, the correlation between the morphology of the perovskite films, the PbI2content, and the energetic distribution of the trap states was investigated. Finally, we discuss the structure-function relationship of perovskite films prepared by different methods.
authors.affiliation: Department of Chemistry, Renmin University of China, Beijing, 100872, China.|Department of Chemistry, National University of Singapore, Singapore, 119077, Singapore.
authors.forename: Yi
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Renmin University of China, Beijing, 100872, China.
authors.forename: Hao-Yi
authors.initials: HY
authors.lastname: Wang
authors.affiliation: Department of Chemistry, Renmin University of China, Beijing, 100872, China.
authors.forename: Man
authors.initials: M
authors.lastname: Yu
authors.affiliation: Department of Chemistry, Renmin University of China, Beijing, 100872, China.
authors.forename: Li-Min
authors.initials: LM
authors.lastname: Fu
authors.affiliation: Department of Chemistry, Renmin University of China, Beijing, 100872, China.
authors.forename: Yujun
authors.initials: Y
authors.lastname: Qin
authors.affiliation: Department of Chemistry, Renmin University of China, Beijing, 100872, China.
authors.forename: Jian-Ping
authors.initials: JP
authors.lastname: Zhang
authors.affiliation: Department of Chemistry, Renmin University of China, Beijing, 100872, China.
authors.forename: Xi-Cheng
authors.initials: XC
authors.lastname: Ai
keywords: charge transfer; morphology; perovskite phases; recombination mechanism; structure-activity relationships