title: Exciton diffusion and charge transfer dynamics in nano phase-separated P3HT/PCBM blend films.
abstract: Exciton quenching dynamics has been systematically studied in pristine P3HT and nano phase separated P3HT/PCBM blend films under various excitation intensities by femtosecond fluorescence up-conversion technique. The behaviors of excitons in the films can be well described by a three-dimensional diffusion model. The small diffusion length and large charge transfer radius indicate that excitons reach the interface most likely by the delocalization of the excitons in P3HT fibrillar at a range of 4.8-9 nm so that the excitons can quickly delocalize in the P3HT domain to reach the interface (instead of by diffusion).
authors.affiliation: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, China.
authors.forename: Hai
authors.initials: H
authors.lastname: Wang
authors.forename: Hai-Yu
authors.initials: HY
authors.lastname: Wang
authors.forename: Bing-Rong
authors.initials: BR
authors.lastname: Gao
authors.forename: Lei
authors.initials: L
authors.lastname: Wang
authors.forename: Zhi-Yong
authors.initials: ZY
authors.lastname: Yang
authors.forename: Xiao-Bo
authors.initials: XB
authors.lastname: Du
authors.forename: Qi-Dai
authors.initials: QD
authors.lastname: Chen
authors.forename: Jun-Feng
authors.initials: JF
authors.lastname: Song
authors.forename: Hong-Bo
authors.initials: HB
authors.lastname: Sun
mesh_terms: D037741:Fullerenes / Q000737:chemistry*; D008027:Light; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008567:Membranes, Artificial; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D016566:Organoselenium Compounds / Q000737:chemistry*; D010316:Particle Size; D044367:Phase Transition; D055672:Static Electricity; D013499:Surface Properties
chemical_list: C539575:(6,6)-phenyl C61-butyric acid methyl ester; D037741:Fullerenes; D046911:Macromolecular Substances; D008567:Membranes, Artificial; D016566:Organoselenium Compounds; C526212:poly(3-hexyl)selenophene