Simple analytic description of collection efficiency in organic photovoltaics

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

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

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
Pages (from-to)704-709
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume4
Issue number5
DOIs
Publication statusPublished - Mar 7 2013

Fingerprint

Carrier transport
Carrier mobility
Charge carriers
Energy conversion
photovoltaic conversion
Electrodes
energy conversion
carrier mobility
figure of merit
charge carriers
purity
selectivity
disorders
electrodes

Keywords

  • Energy and Charge Transport
  • Energy Conversion and Storage

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Simple analytic description of collection efficiency in organic photovoltaics. / Savoie, Brett M.; Movaghar, Bijan; Marks, Tobin J; Ratner, Mark A.

In: Journal of Physical Chemistry Letters, Vol. 4, No. 5, 07.03.2013, p. 704-709.

Research output: Contribution to journalArticle

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