Recombination dynamics as a key determinant of open circuit voltage in organic bulk heterojunction solar cells: A comparison of four different donor polymers

Andrea Maurano, Rick Hamilton, Chris G. Shuttle, Amy M. Ballantyne, Jenny Nelson, Brian O'Regan, Weimin Zhang, Iain Mcculloch, Hamed Azimi, Mauro Morana, Christoph J. Brabec, James R. Durrant

Research output: Contribution to journalArticlepeer-review

324 Scopus citations

Abstract

Transient photovoltage and charge extraction analyses are employed to analyzes charge carrier densities and bimolecular recombination dynamics in organic polymer: fullerene solar cells under open circuit operating conditions, employing four different donor polymers. An equation is derived which allows us to calculate the device VOC from these kinetic measurements. This equation allows us to calculate voltage output of devices within ± 25 meV of directly measured values. This analysis thus allows us to relate device open circuit voltage directly to the kinetics of bimolecular recombination, and thereby the influence of nanomorphology upon device voltage output.

Original languageEnglish (US)
Pages (from-to)4987-4992
Number of pages6
JournalAdvanced Materials
Volume22
Issue number44
DOIs
StatePublished - Nov 24 2010

Keywords

  • bimolecular recombination
  • charge dynamics
  • open circuit voltage
  • organic solar cell
  • power conversion efficiency

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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