Journal
MRS BULLETIN
Volume 30, Issue 1, Pages 28-32Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1557/mrs2005.5
Keywords
organic photovoltaics; solar cell efficiency
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We consider the fundamental limits to organic solar cell efficiency, and the schemes that have been used to overcome many of these limitations. In particular, the use of double and bulk heterojunctions, as well as tandem cells employing materials with exciton diffusion lengths, is discussed. We show that in the was few years, a combination of strategies has led to a power conversion efficiency of eta(p) = 5.7% (under AM 1.5 G simulated solar radiation at 1 sun intensity) for tandem cells based on small-molecular-weight materials, suggesting that even higher efficiencies are possible. We conclude by considering the ultimate power conversion efficiency that is expected from organic thin-film solar cells.
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