Temporal probing of excitons in organic semiconductors

Palas Roy, Jyotishman Dasgupta

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
5 Downloads (Pure)

Abstract

Photoinduced charge generation forms the physical basis for energy conversion in organic photovoltaic (OPV) technology. The fundamental initial steps involved are absorption of light by organic semiconductors (generally π-conjugated polymers) to generate photoexcited states (Frenkel excitons) followed by charge transfer and charge separation processes in presence of suitable acceptor. The absorbed photon energy must be utilized completely for achieving maximum device efficiency. However progressive relaxation losses of instantaneously generated high-energy or hot-excited states form major bottleneck for maximum derivable voltage. This efficiency limiting factor has been challenged recently by the role of hot-carriers in efficient generation of charges. Therefore tailoring the dissociation of hot-exciton to be temporally faster than all relaxation processes could minimize the energy loss pathways. Implementation of this concept of hot-carrier photovoltaics demands critical understanding of molecular parameters that circumvent all energy relaxation processes and favor hot-carrier generation. In my dissertation work, I have examined the fate of photo-generated excitons in the context of polymer backbone and morphology, and therefore obtain a fundamental structure-function correlation in organic semiconductors.
Original languageEnglish
Pages (from-to)707-716
Number of pages10
JournalPure and Applied Chemistry
Volume92
Issue number5
Early online date22 Apr 2020
DOIs
Publication statusPublished - 1 May 2020

Keywords

  • 2018 IUPAC-Solvay Award
  • IUPAC-SOLVAY International Award for Young Chemists
  • conjugated polymer
  • exciton
  • organic semiconductors
  • photovoltaics
  • polaron
  • polaron pair
  • transient absorption

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