Singlet Exciton Fission for Solar Cell Applications: Energy Aspects of Interchromophore Coupling

Eric C. Greyson, Brian R. Stepp, Xudong Chen, Andrew F. Schwerin, Irina Paci, Millicent B. Smith, Akin Akdag, Justin C. Johnson, Arthur J. Nozik, Josef Michl, Mark A. Ratner

Research output: Contribution to journalArticlepeer-review

125 Scopus Citations

Abstract

Singlet exciton fission, a process that converts one singlet exciton to a pair of triplet excitons, has the potential to enhance the efficiency of both bulk heterojunction and dye-sensitized solar cells and is understood in crystals but not well understood in molecules. Previous studies have identified promising building blocks for singlet fission in molecular systems, but little work has investigated how these individual chromophores should be combined to maximize triplet yield. We consider the effects of chemically connecting two chromophores to create a coupled chromophore pair and compute how various structural choices alter the thermodynamic and kinetic parameters likely to control singlet fission yield. We use density functional theory to compute the electron transfer matrix element and the thermodynamics of fission for several promising chromophore pairs and find a trade-off between the desire to maximize this element and the desire to keep the singlet fission process exoergic. We identify promising molecular systems for singlet fission and suggest future experiments.

Original languageAmerican English
Pages (from-to)14223-14232
Number of pages10
JournalJournal of Physical Chemistry B
Volume114
Issue number45
DOIs
StatePublished - 2010

NREL Publication Number

  • NREL/JA-590-47577

Keywords

  • interchromophore coupling
  • singlet exciton fission
  • solar cells
  • triplet excitons

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