Exploring the exciton dissociation process at a donor-acceptor heterojunction in both time and space via an induced Stark shift

Noel C. Giebink, Barry P. Rand, David Cheyns, Jan Genoe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The dissociation of excitons at a donor-acceptor interface in organic photovoltaic devices is an important but poorly understood process that takes place over multiple length and time scales. Here, we introduce a method to resolve photoinduced charge movement at an organic heterojunction in both time and space through observation of the Stark shift induced in a nearby J-aggregate probe layer. Using ultrafast transient absorption measurements, we show that this technique provides an opportunity to quantify the recombination and separation dynamics of geminate charge pairs over the entire sub-picosecond to millisecond range of relevant time scales.

Original languageEnglish (US)
Title of host publicationOrganic Photonics V
DOIs
StatePublished - Jun 20 2012
Externally publishedYes
EventOrganic Photonics V - Brussels, Belgium
Duration: Apr 16 2012Apr 18 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume8435
ISSN (Print)0277-786X

Other

OtherOrganic Photonics V
CountryBelgium
CityBrussels
Period4/16/124/18/12

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Keywords

  • Stark shift
  • exciton dissociation
  • geminate pair
  • organic photovoltaics

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