Study on the internal conversion dynamics following different electron transfer at a donor/acceptor polymer heterointerface

Kun Gao*, Shijie Xie, Sun Yin, Ruixuan Meng, Yuan Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

By constructing a donor/acceptor (D/A) polymer heterointerface, we theoretically study the internal conversion (IC) dynamics following different electron transfer at the D/A interface in the framework of a tight-binding model combined with a nonadiabatic evolution method. We find that different higher-lying charge-transfer (CT) states can form at the D/A interface with the natures determined by the transferred electron energy. As compared with the lowest-lying CT state, these higher-lying CT states are spatially more delocalized and energetically more prone to separate into free charges. By simulating the IC relaxation dynamics of these higher-lying CT states, we find that their timescales are closely related to the transferred electron energy, as well as the D/A interfacial electronic structure. In addition, considering that the IC relaxation dynamics is vibrationally assisted, effect of the vibrational damping on the process is discussed. These researches should be of crucial importance for further understanding the photovoltaic process at a D/A polymer heterointerface, especially the "hot CT mechanism" experimentally suggested to explain the highly efficient charge separation in high-performing D/A polymer solar cells.

Original languageEnglish (US)
Pages (from-to)73-81
Number of pages9
JournalOrganic Electronics
Volume28
DOIs
StatePublished - Jan 1 2016

Keywords

  • Charge transfer
  • Interface
  • Internal conversion
  • Polymers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Study on the internal conversion dynamics following different electron transfer at a donor/acceptor polymer heterointerface'. Together they form a unique fingerprint.

Cite this