Spectral aspects of cavity tuned absorption in organic photovoltaic films

Brent Valle, Stephen Loser, Jonathan W. Hennek, Vincent De George, Courtney Klosterman, James H. Andrews, Kenneth D. Singer, Tobin J. Marks

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


Concentration of light and infrared capture are two favored approaches for increasing the power conversion efficiency (PCE) of photovoltaic devices. Using optical transfer matrix formalism, we model the absorption of organic photovoltaic films as a function of active layer thickness and incident wavelength. In our simulations we consider the absorption in the optical cavity formed by the polymer bulk heterojunction active layer (AL) between the aluminum cathode and indium tin oxide (ITO) anode. We find that optical absorption can be finely tuned by adjusting the ITO thickness within a relatively narrow range, thus eliminating the need for a separate optical spacer. We also observe distinct spectral effects due to frequency pulling which results in enhanced longwavelength absorption. Spectral sculpting can be carried out by cavity design without affecting the open circuit voltage as the spectral shifts are purely optical effects. We have experimentally verified aspects of our modeling and suggest methods to improve device design.

Original languageEnglish (US)
Pages (from-to)A954-A963
JournalOptics Express
Issue number106
StatePublished - Nov 5 2012

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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