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Siloxane Decorated Water-Obstructing Guest for Efficient Air-Processed OSCs.

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Summary

A novel water-obstructing guest (WOG) strategy using D18-SiO enhances organic solar cell (OSC) stability and processability. This approach improves power conversion efficiencies and device longevity under humid conditions.

Keywords:
air‐processed organic solar cellhigh humiditysiloxanewater‐obstructing guest

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Area of Science:

  • Materials Science
  • Renewable Energy Engineering
  • Organic Electronics

Background:

  • Organic solar cells (OSCs) face significant challenges in ambient stability and processability, especially for large-area air-processed applications.
  • Water-induced degradation of the active layer is a critical bottleneck limiting the development and commercialization of OSCs.
  • Existing strategies often struggle to balance moisture protection with maintaining optimal film morphology.

Purpose of the Study:

  • To develop a water-obstructing guest (WOG) strategy to improve the ambient stability and processability of organic solar cells (OSCs).
  • To investigate the role of a siloxane-containing polymer (D18-SiO) as a WOG in mitigating water-induced degradation.
  • To evaluate the impact of the WOG strategy on device performance, film morphology, and long-term stability under high relative humidity (RH).

Main Methods:

  • Introduction of a siloxane-containing polymer (D18-SiO) as a water-obstructing guest (WOG) into the active layer blend.
  • Fabrication of OSCs using both spin-coating and blade-coating techniques across a range of relative humidity (RH) conditions.
  • Characterization of film morphology, trap density, and device performance (PCE) under varying RH levels.
  • Long-term stability testing of unencapsulated OSCs under continuous illumination and ambient conditions (≈40% RH).

Main Results:

  • OSCs fabricated with the D18-SiO WOG strategy achieved power conversion efficiencies (PCE) exceeding 19% (spin coating) and 17% (blade coating at 90% RH).
  • The WOG strategy effectively suppressed trap density and preserved ideal nano-micromorphology, characterized by high crystallinity and tight packing.
  • Unencapsulated OSCs retained 80.7% of their initial performance after 600 hours of continuous operation under light illumination in air (≈40% RH).

Conclusions:

  • The proposed WOG strategy using D18-SiO is highly effective in enhancing the ambient stability and processability of air-processed OSCs.
  • This approach provides a protective barrier against moisture, crucial for the development of durable and scalable organic solar technologies.
  • The demonstrated potential for large-scale production highlights the WOG strategy as a promising pathway for advancing the commercial viability of OSCs.