Efficient tandem polymer solar cells fabricated by all-solution processing
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- Efficient tandem polymer solar cells fabricated by all-solution processing
- Kim, Jin Young; Lee, Kwanghee; Coates, Nelson E.; Moses, Daniel; Nguyen, Thuc-Quyen; Dante, Mark; Heeger, Alan J.
- PHOTOVOLTAIC CELLS; HETEROJUNCTIONS; PERFORMANCE; NETWORK; BLENDS
- Issue Date
- AMER ASSOC ADVANCEMENT SCIENCE
- SCIENCE, v.317, no.5835, pp.222 - 225
- 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.
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