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Efficient tandem polymer solar cells fabricated by all-solution processing.

Jin Young Kim1, Kwanghee Lee, Nelson E Coates

  • 1Center for Polymers and Organic Solids, University of California, Santa Barbara, CA 93106-5090, USA.

Science (New York, N.Y.)
|July 14, 2007
PubMed
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Solution-processed tandem solar cells utilizing semiconducting polymers and fullerene derivatives achieved over 6% power-conversion efficiency. This advancement enhances solar energy harvesting by combining two cells with distinct absorption properties.

Area of Science:

  • Materials Science
  • Renewable Energy
  • Photovoltaics

Background:

  • Tandem solar cells integrate multiple cells to capture a broader solar spectrum.
  • Solution processing offers a cost-effective fabrication method for photovoltaic devices.

Purpose of the Study:

  • To fabricate solution-processed tandem solar cells using bulk heterojunction materials.
  • To enhance solar energy conversion efficiency by optimizing tandem cell architecture.

Main Methods:

  • Fabrication of tandem solar cells using semiconducting polymers and fullerene derivatives.
  • Incorporation of a transparent titanium oxide (TiO(x)) layer as an electron transport layer and substrate.
  • Utilizing an inverted structure with low and high band-gap polymer composites for front and back cells, respectively.

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Main Results:

  • Achieved power-conversion efficiencies exceeding 6% under specific illumination conditions (200 milliwatts per square centimeter).
  • Demonstrated the effectiveness of the TiO(x) layer in facilitating tandem cell fabrication and function.

Conclusions:

  • Solution-processed tandem solar cells show significant potential for efficient solar energy harvesting.
  • The developed architecture and materials are promising for next-generation photovoltaic applications.