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Molecular Multilayer Organic Solar Cells with Large Excitonic Diffusion Length

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Abstract

We report on the photovoltaic properties of organic solar cells based on pentacene and C60 thin films. A peak external quantum efficiency (EQE) of 69 % at a wavelength of λ = 668 nm is achieved upon optimization of the exciton blocking layer (EBL) thickness. Complex optical functions of pentacene films are measured as a function of wavelength by spectroscopic ellipsometry and used to analyze the EQE spectra. Detailed analysis of the EQE spectra indicate that the pentacene layers exhibit large excitonic diffusion lengths of ∼70 nm and that the performance improvement in EQE can be attributed to the influence of the thickness of the EBL layer on the carrier collection efficiency.

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Authors and Affiliations

  1. School of Electrical and Computer Engineering, Georgia Institute of Technology, 777 Atlantic Dr., Atlanta, GA, 30332-0250, USA

    Seunghyup Yoo, William J. Potscavage, Benoit Domercq & Bernard Kippelen

  2. NREL, Golden, CO, 80401, USA

    Sung-Ho Han & Dean Levi

Authors
  1. Seunghyup Yoo
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  2. William J. Potscavage
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  3. Benoit Domercq
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  4. Sung-Ho Han
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  5. Dean Levi
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  6. Bernard Kippelen
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Yoo, S., Potscavage, W.J., Domercq, B. et al. Molecular Multilayer Organic Solar Cells with Large Excitonic Diffusion Length. MRS Online Proceedings Library 965, 1101 (2006). https://doi.org/10.1557/PROC-0965-S11-01

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  • DOI: https://doi.org/10.1557/PROC-0965-S11-01

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