Modelling of external quantum efficiency spectra as a function of varying P3OT thickness in P3OT-C60 polymer photovoltaic devices

A. Gopal; M. Drees; R. M. Davis; J. R. Heflin

doi:10.1117/12.615987

3 October 2005 Modelling of external quantum efficiency spectra as a function of varying P3OT thickness in P3OT-C₆₀ polymer photovoltaic devices

A. Gopal, M. Drees, R. M. Davis, J. R. Heflin

Author Affiliations +

Proceedings Volume 5938, Organic Photovoltaics VI; 593813 (2005) https://doi.org/10.1117/12.615987
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

In this paper we present a study of thermally interdiffused poly (3-octylthiophene) (P3OT) - C₆₀ photovoltaic devices of varying polymer and fullerene layer thicknesses. It is found that overall device performance and external quantum efficiencies (EQEs) in the wavelength region of peak absorption are enhanced for thinner polymer as well as thinner fullerene layers. We present a simple, first level model for EQE curves that accounts for the effects of absorption throughout the film. The model considers 3 distinct regions; pure donor, interdiffused donor and acceptor, and pure acceptor. It is found that this model reproduces quite effectively the experimentally observed shapes and relative magnitudes for varying donor thickness when compared with a similar experimental study. It also reproduces the shapes of the EQE curves but is not as effective in reproducing the relative magnitudes for varying fullerene thickness devices.

Citation Download Citation

A. Gopal, M. Drees, R. M. Davis, and J. R. Heflin "Modelling of external quantum efficiency spectra as a function of varying P3OT thickness in P3OT-C₆₀ polymer photovoltaic devices", Proc. SPIE 5938, Organic Photovoltaics VI, 593813 (3 October 2005); https://doi.org/10.1117/12.615987

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