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Science 15 December 1995:
Vol. 270. no. 5243, pp. 1789 - 1791
DOI: 10.1126/science.270.5243.1789
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Reports
Polymer Photovoltaic Cells: Enhanced Efficiencies via a
Network of Internal Donor-Acceptor Heterojunctions
G. Yu (1),
J. Gao,
J. C. Hummelen,
F. Wudl,
A. J. Heeger
The carrier collection efficiency ( c) and energy
conversion efficiency (e) of polymer photovoltaic cells
were improved by blending of the semiconducting polymer with
C60 or its functionalized derivatives. Composite films of
poly(2-methoxy-5-(2`-ethyl-hexyloxy)-1,4-phenylene vinylene)
(MEH-PPV) and fullerenes exhibit c of about 29
percent of electrons per photon and e of about 2.9
percent, efficiencies that are better by more than two orders of
magnitude than those that have been achieved with devices made with
pure MEH-PPV. The efficient charge separation results from photoinduced
electron transfer from the MEH-PPV (as donor) to C60 (as
acceptor); the high collection efficiency results from a bicontinuous
network of internal donor-acceptor heterojunctions.
Institute for Polymers and Organic Solids, University of
California at Santa Barbara, Santa Barbara, CA 93106-5090, USA.
(1) Present address: UNIAX Corporation, 6780 Cortona Drive, Santa
Barbara, CA 93117-3022, USA.
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