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Organic Photonics and Photovoltaics

Editor-in-Chief: Facchetti, Antonio

Ed. by Ponomarenko, Sergei

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Emerging Science

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2299-3177
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Electric Field Distribution in Hybrid Solar Cells Comprising an Organic Donor Polymer and Amorphous Silicon

S. Schaefer
  • Universität Potsdam, Institute of Physics and Astronomy, Soft Matter Physics, D-14476 Potsdam, Germany
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/ S. Albrecht
  • Universität Potsdam, Institute of Physics and Astronomy, Soft Matter Physics, D-14476 Potsdam, Germany
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/ D. Neher
  • Universität Potsdam, Institute of Physics and Astronomy, Soft Matter Physics, D-14476 Potsdam, Germany
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/ T. F. Schulze
  • Department of Silicon Photovoltaics, Helmholtz Center Berlin for Materials and Energy, Kekulestr. 5, D-12489 Berlin, Germany
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/ E. Conrad
  • Department of Silicon Photovoltaics, Helmholtz Center Berlin for Materials and Energy, Kekulestr. 5, D-12489 Berlin, Germany
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/ L. Korte
  • Department of Silicon Photovoltaics, Helmholtz Center Berlin for Materials and Energy, Kekulestr. 5, D-12489 Berlin, Germany
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/ B. Rech
  • Department of Silicon Photovoltaics, Helmholtz Center Berlin for Materials and Energy, Kekulestr. 5, D-12489 Berlin, Germany
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/ J. Wördenweber / A. Gordijn / U. Scherf
  • Bergische Universität Wuppertal, Macromolecular Chemistry and Institute for Polymer Technology, Gauss-Strasse 20, D-42097 Wuppertal, Germany
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/ I. Dumsch
  • Bergische Universität Wuppertal, Macromolecular Chemistry and Institute for Polymer Technology, Gauss-Strasse 20, D-42097 Wuppertal, Germany
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Published Online: 2014-06-09 | DOI: https://doi.org/10.2478/oph-2014-0004

Abstract

We present a study on the performance and analysis of hybrid solar cells comprising a planar heterojunction between between a conjugated donor polymer, P3HT or PCPDTBT, and hydrogenated amorphous silicon (a-Si:H). A comparison of the modeled absorption spectra of the layer stack with the measured external quantum efficiency is used to investigate the contribution of the inorganic and organic material to the photocurrent generation in the device. Although both materials contribute to the photocurrent, the devices exhibit poor quantum efficiencies and low short circuit currents. Bandstructure simulations of the hybrid layer structure reveal that an unfavorable electric field distribution within the planar multilayer structure limits the performance. Using electroabsorption measurements we can show that the electric field is extremelyweak in the amorphous silicon but strong in the organic material. The situation changes drasticallywhen the conjugated polymer is p-doped. Doping not only increases the conductivity of the organic material, but also restores the electric field in the amorphous silicon layer. Optimized hybrid solar cells comprising thin doped P3HT layers exhibit energy conversion efficiencies (ECE) up to 2.8 %.

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About the article


Received: 2013-08-16

Accepted: 2014-01-10

Published Online: 2014-06-09


Citation Information: Organic Photonics and Photovoltaics, ISSN (Online) 2299-3177, DOI: https://doi.org/10.2478/oph-2014-0004.

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©2014 S. Schaefer et al. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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