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Researchers developed new siloxane-terminated side chains for organic solar cells (OSCs). These chains improve both power conversion efficiency (PCE) and stretchability in flexible electronics.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Polymer Chemistry

Background:

  • Flexible and stretchable organic solar cells (OSCs) are crucial for wearable electronics.
  • Achieving high power conversion efficiency (PCE) and excellent stretchability simultaneously in OSCs remains a challenge.
  • Current high-performance OSCs often use polymer donors (PDs) and small-molecule acceptors (SMAs).

Purpose of the Study:

  • To synthesize and evaluate a novel polymerized-small-molecule acceptor (P-SMA) with siloxane-terminated side chains (PY-SiO).
  • To compare the photovoltaic and mechanical properties of PY-SiO against a reference P-SMA with ethylhexyl-terminated side chains (PY-EH).
  • To investigate the potential of siloxane-terminated side chains for high-performance, stretchable OSCs.

Main Methods:

  • Synthesis of PY-SiO and PY-EH polymerized-small-molecule acceptors.
  • Fabrication of all-polymer solar cells (all-PSCs) using PBDB-T as the polymer donor.
  • Characterization of photovoltaic performance (PCE) and mechanical properties (crack-onset strain).
  • Evaluation of device performance under mechanical strain.

Main Results:

  • PY-SiO incorporation optimized film morphology, enhancing molecular aggregation and charge transport.
  • All-PSCs based on PBDB-T/PY-SiO achieved a higher PCE (12.04%) compared to PBDB-T/PY-EH (10.85%).
  • Siloxane-terminated side chains improved film crack-onset strain (18.32% for PY-SiO vs. 11.15% for PY-EH).
  • Stretchable all-PSCs with PY-SiO maintained >70% PCE under 20% strain, outperforming PY-EH-based devices.

Conclusions:

  • Siloxane-terminated side chains are effective in simultaneously enhancing PCE and stretchability in OSCs.
  • The optimized molecular aggregation and film morphology contribute to improved device performance.
  • PY-SiO represents a promising material for developing next-generation high-performance, stretchable organic electronics.