Photoinduced charge transfer in quasi-one-dimensional polymers in two-photon absorption.

ABSTRACT: In this work, we theoretically investigate the structure and the transition characteristics of one- (OPA) and two-photon absorption (TPA) spectra of different length neutral and charged thiophene polymers. The effects and regulation of different charges on photoinduced charge transfer are discovered and their physical mechanisms are explained. We find that both the OPA and TPA spectra undergo a sizeable redshift after the charge is injected into the polymer, and the redshift after the positive charge injection is excellent. The alternating charge transfer that occurs in a two-photon transition of a charged system is derived from the alternating distribution of charge (dipole moment) in the dynamics of the system. To study the gradual behavior of infinite polymers, we also theoretically cal

SUBMITTER: Yan PJ 

PROVIDER: S-EPMC9056739 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature