Efficient Tandem Polymer Solar Cells Fabricated by All-Solution Processing

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 derivat...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 2007-07, Vol.317 (5835), p.222-225
Main Authors: Kim, Jin Young, Lee, Kwanghee, Coates, Nelson E, Moses, Daniel, Nguyen, Thuc-Quyen, Dante, Mark, Heeger, Alan J
Format: Article
Language:English
Subjects:
Absorption spectra
Applied sciences
Architecture
Banded structure
Composite materials
Conversion
Derivatives
Electric current
Energy
Exact sciences and technology
Heterojunctions
Illumination
Luminous intensity
Materials
Materials science
Natural energy
Photovoltaic cells
Photovoltaic conversion
Polymers
Power efficiency
Solar cells
Solar cells. Photoelectrochemical cells
Solar energy
Titanium oxides
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Summary: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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1141711