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Small molecule-based tandem solar cells with solution-processed and vacuum-processed photoactive layers.

Werther Cambarau1, Aurélien Viterisi, James W Ryan

  • 1Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans, 16, Tarragona 43007, Spain. epalomares@iciq.es aviterisi@iciq.es.

Chemical Communications (Cambridge, England)
|December 12, 2013
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Summary

This study presents a novel tandem solar cell made entirely from small molecules (SMs). Both solution and vacuum processing were used to create efficient sub-cells for solar energy conversion.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Renewable Energy

Background:

  • Small molecule (SM) solar cells offer tunable optoelectronic properties.
  • Tandem solar cells enhance power conversion efficiency by stacking sub-cells.
  • Integrating solution-processed and vacuum-processed SMs presents fabrication challenges.

Purpose of the Study:

  • To develop a tandem solar cell exclusively from small molecules (SMs).
  • To investigate the performance of a tandem device fabricated using both solution and vacuum processing techniques.
  • To explore novel active layer materials for efficient solar energy conversion.

Main Methods:

  • Fabrication of a tandem solar cell using small molecules (SMs).
  • Front sub-cell: Bulk heterojunction (BHJ) active layer (DPP(TBFu)2:PC70BM).
  • Back sub-cell: Bilayer structure (squaraine (SQ) donor: C60 acceptor).
  • Utilized both solution-processed and vacuum-processed deposition techniques.

Main Results:

  • Successfully fabricated a tandem solar cell using only small molecules (SMs).
  • Demonstrated the integration of solution-processed and vacuum-processed sub-cells within a single device.
  • Achieved efficient solar energy conversion through optimized active layer materials and device architecture.

Conclusions:

  • Tandem solar cells fabricated exclusively from small molecules (SMs) are feasible.
  • The combination of solution and vacuum processing enables versatile device fabrication.
  • This approach holds promise for advancing efficient and cost-effective organic solar cell technologies.