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Morphology Control for Fully Printable Organic&#8211;Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
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Parallel bulk-heterojunction solar cell by electrostatically driven phase separation.

Antti Ojala1, Hannah Bürckstümmer, Matthias Stolte

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Advanced Materials (Deerfield Beach, Fla.)
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Summary
This summary is machine-generated.

Combining fullerene (C60) with two merocyanine dyes in solar cells significantly boosts performance. This approach enhances short-circuit currents and power conversion efficiencies compared to single-donor systems.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Bulk heterojunction solar cells are crucial for renewable energy.
  • Fullerene (C60) and merocyanine dyes are common organic semiconductors used in these devices.
  • Optimizing morphology and molecular interactions is key to improving solar cell efficiency.

Purpose of the Study:

  • To investigate the effect of combining C60 fullerene with two different merocyanine dyes on the performance of bulk heterojunction solar cells.
  • To understand the underlying mechanisms responsible for any observed improvements in device efficiency.

Main Methods:

  • Fabrication of bulk heterojunction solar cells using thermal co-evaporation of C60 fullerene and two merocyanine dyes.
  • Characterization of the resulting solar cells, focusing on short-circuit current and power conversion efficiency.
  • Analysis of the film morphology and molecular interactions to explain performance variations.

Main Results:

  • Solar cells incorporating both C60 fullerene and two merocyanine dyes exhibited enhanced short-circuit currents and power conversion efficiencies compared to cells with only a single donor.
  • The improved performance was attributed to the formation of three distinct subphases within the bulk heterojunction.
  • Differences in molecular shape and electrostatic interactions between the components were identified as the driving forces for subphase formation.

Conclusions:

  • The strategic combination of C60 fullerene with multiple merocyanine dyes offers a viable route to enhance the performance of organic solar cells.
  • Understanding and controlling the nanoscale morphology, specifically the formation of multiple subphases, is critical for optimizing bulk heterojunction solar cell design.
  • Molecular design and processing conditions play a significant role in dictating intermolecular interactions and ultimately device efficiency.