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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells
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11.2% All-Polymer Tandem Solar Cells with Simultaneously Improved Efficiency and Stability.

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Summary

Highly stable all-polymer solar cells (all-PSCs) show improved interfacial stability. New homojunction tandem all-PSCs achieve over 11% power conversion efficiency and retain 93% after 1000 hours at 80°C.

Keywords:
all-polymer solar cellhomojunction tandeminterfacial charge dissociationinterfacial stability

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • All-polymer solar cells (all-PSCs) offer enhanced stability over small-molecule organic solar cells.
  • Interfacial stability is crucial for long-term performance of all-PSCs.
  • Metal electrode atom diffusion into the active layer degrades device efficiency.

Purpose of the Study:

  • Investigate interfacial stability in highly stable all-PSCs.
  • Identify strategies to mitigate metal atom diffusion.
  • Develop high-efficiency and stable all-PSC devices.

Main Methods:

  • Utilized a highly stable all-PSC platform for interfacial studies.
  • Explored strategies including thicker interlayers, high-glass-transition-temperature interlayers, and tandem structures.
  • Fabricated homojunction tandem all-PSCs.

Main Results:

  • Identified metal electrode atom diffusion as a key degradation pathway.
  • Demonstrated that thicker/high-Tg interlayers and tandem structures effectively block diffusion.
  • Achieved a record power conversion efficiency exceeding 11% in homojunction tandem all-PSCs.

Conclusions:

  • Homojunction tandem all-PSCs overcome interfacial stability issues.
  • The developed devices exhibit remarkable operational stability, retaining 93% efficiency after 1000 hours at 80°C.
  • This work paves the way for robust and efficient all-polymer solar cells.