Engineering Charge-Transfer States for Efficient, Low-Energy-Loss Organic Photovoltaics

Xiao Liu, Barry P. Rand, Stephen R. Forrest

Research output: Contribution to journalReview articlepeer-review

9 Scopus citations

Abstract

Charge transfer (CT) between donors and acceptors following photoexcitation of organic photovoltaics (OPVs) gives rise to bound electron–hole pairs across the donor–acceptor interface, known as CT states. While these states are essential to charge separation, they are also a source of energy loss. As a result of reduced overlap between electron and hole wavefunctions, CT states are influenced by details of the film morphology and molecular structure. Here, we describe several important strategies for tuning the energy level and dynamics of the CT state and approaches that can enhance their dissociation efficiency into free charges. Furthermore, we provide an overview of recent physical insights into the key parameters that significantly reduce the Frenkel-to-CT energy offset and recombination energy losses while preserving a high charge-generation yield. Our analysis leads to critical morphological and molecular design strategies for achieving efficient, low-energy-loss OPVs.

Original languageEnglish (US)
Pages (from-to)815-829
Number of pages15
JournalTrends in Chemistry
Volume1
Issue number9
DOIs
StatePublished - Dec 2019

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Keywords

  • Marcus theory
  • charge transfer
  • energy loss
  • molecular structure
  • morphology
  • organic solar cell

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