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Thermally Stable High-Performance Polymer Solar Cells Enabled by Interfacial Engineering.

Chao-Hsuan Chen1, Zhi-Wei Lin2, Kuan-Min Huang1

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Summary

Novel cathode interfacial layers (CILs) using MSAPBS and PEI significantly enhance polymer solar cell (PSC) performance and stability. PEI-based PSCs show over 6000 hours of stability, outperforming traditional LiF CILs.

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electrodesheterojunctionsinterfacespolymerssolar cells

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Interfacial engineering is crucial for polymer solar cell (PSC) performance and longevity.
  • Developing efficient and stable cathode interfacial layers (CILs) is key for commercial viability.

Purpose of the Study:

  • To fabricate thermally stable, high-efficiency PSCs using novel solution-processed CILs.
  • To evaluate the performance and stability of PSCs with MSAPBS and PEI as CILs.

Main Methods:

  • Incorporation of 4,4'-({[methyl(4-sulfonatobutyl)ammonio]bis(propane-3,1-diyl)}bis(dimethylammoniumdiyl))bis(butane-1-sulfonate) (MSAPBS) and polyethylenimine (PEI) as CILs.
  • Fabrication of inverted PSCs using PBDTTT-EFT:PC71BM active layers.
  • Performance and accelerated aging tests (80°C, ambient) to assess device stability.

Main Results:

  • PSCs with MSAPBS and PEI CILs achieved maximum power conversion efficiencies (PCEs) of 8.1% and 7.2%, respectively.
  • Inverted PSCs with PEI CILs demonstrated exceptional stability, exceeding 6000 hours under thermal aging.
  • PEI CILs significantly outperformed commonly used LiF CILs (approx. 33 hours lifetime).

Conclusions:

  • Solution-processed MSAPBS and PEI are effective CILs for high-performance and stable PSCs.
  • PEI-based CILs offer a promising pathway to achieve commercially viable PSCs with long-term operational stability.
  • This work encourages further research into novel CILs for advanced photovoltaic applications.