Simple analytic description of collection efficiency in organic photovoltaics

Brett M. Savoie*, Bijan Movaghar, Tobin J. Marks, Mark A. Ratner

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


The collection of charge carriers is a fundamental step in the photovoltaic conversion process. In disordered organic films, low mobility and disorder can make collection the performance-limiting step in energy conversion. We derive two analytic relationships for carrier collection efficiency in organic photovoltaics that account for the presence or absence of carrier-selective electrodes. These equations directly include drift and diffusive carrier transport in the device active layers and account for possible losses from Langevin and Shockley-Read-Hall recombination mechanisms. General relationships among carrier mobility, contact selectivity, recombination processes, and organic photovoltaic figures of merit are established. Our results suggest that device collection efficiency remains mobility-limited for many materials systems, and a renewed emphasis should be placed on materials' purity.

Original languageEnglish (US)
Pages (from-to)704-709
Number of pages6
JournalJournal of Physical Chemistry Letters
Issue number5
StatePublished - Mar 7 2013


  • Energy Conversion and Storage
  • Energy and Charge Transport

ASJC Scopus subject areas

  • General Materials Science
  • Physical and Theoretical Chemistry


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