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Proceedings Paper

Theoretical analysis of composite polymer solar cell function
Author(s): Vladimir M. Aroutiounian; Helmut Tributsch
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Paper Abstract

Published information on polymer composite solar cells was screened to pin down the most critical parameters for a further improvement of these photovoltaic systems towards higher efficiency and stability. Largely irreversible separation of photocharge between the polymer (e.g. PPV) and the fullerene with subsequent percolation of electrons (e.g. to the Al contact) and holes (to the ITO contact), under the symmetry breaking influence of an electric field imposed by the work function difference of the contacts (Al and ITO respectively) accounts for photocurrent generation. The energetics is determined by n-p hetero junction, which is formed between ITO and the polymer/fullerene composite. Positive polarization of the ITO contact leads to the generation of an interfacial potential drop and an increase of the effective ITO work function. This explains the generation of a photovoltage reaching more than 0.8 Volt. Parameters limiting solar cell performance are discussed.

Paper Details

Date Published: 21 February 2002
PDF: 12 pages
Proc. SPIE 4465, Organic Photovoltaics II, (21 February 2002); doi: 10.1117/12.456938
Show Author Affiliations
Vladimir M. Aroutiounian, Yerevan State Univ. (Armenia)
Helmut Tributsch, Hahn-Meitner-Institute (Germany)

Published in SPIE Proceedings Vol. 4465:
Organic Photovoltaics II
Zakya H. Kafafi; Denis Fichou, Editor(s)

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