• DOI:10.1126/SCIENCE.1141711
• Corpus ID: 17727070

Efficient Tandem Polymer Solar Cells Fabricated by All-Solution Processing

@article{Kim2007EfficientTP,
  title={Efficient Tandem Polymer Solar Cells Fabricated by All-Solution Processing},
  author={Jin Young Kim and Kwanghee Lee and Nelson E. Coates and Daniel Moses and Thuc‐Quyen Nguyen and Mark Dante and Alan J. Heeger},
  journal={Science},
  year={2007},
  volume={317},
  pages={222 - 225}
}

• J. Y. Kim, Kwanghee Lee, +4 authors A. Heeger
• Published 13 July 2007
• Materials Science
• Science

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.