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Science 13 July 2007:
Vol. 317. no. 5835, pp. 222 - 225
DOI: 10.1126/science.1141711
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Reports

Efficient Tandem Polymer Solar Cells Fabricated by All-Solution Processing

Jin Young Kim,1,2 Kwanghee Lee,1,2* Nelson E. Coates,1 Daniel Moses,1 Thuc-Quyen Nguyen,1 Mark Dante,1 Alan J. Heeger1

Tandem solar cells, in which two solar cells with different absorption characteristics are linked to use a wider range of the solar spectrum, were fabricated with each layer processed from solution with the use of bulk heterojunction materials comprising semiconducting polymers and fullerene derivatives. A transparent titanium oxide (TiOx) layer separates and connects the front cell and the back cell. The TiOx layer serves as an electron transport and collecting layer for the first cell and as a stable foundation that enables the fabrication of the second cell to complete the tandem cell architecture. We use an inverted structure with the low band-gap polymer-fullerene composite as the charge-separating layer in the front cell and the high band-gap polymer composite as that in the back cell. Power-conversion efficiencies of more than 6% were achieved at illuminations of 200 milliwatts per square centimeter.

1 Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106–5090, USA.
2 Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 500-712, Korea.

* To whom correspondence should be addressed. E-mail: klee{at}gist.ac.kr

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Solar Power Wires Based on Organic Photovoltaic Materials.
M. R. Lee, R. D. Eckert, K. Forberich, G. Dennler, C. J. Brabec, and R. A. Gaudiana (2009)
Science 324, 232-235
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Science. ISSN 0036-8075 (print), 1095-9203 (online)