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Molecularly Interlocked Interfaces Enable Record-Efficiency Stretchable Organic Photovoltaics.

Haojie Li1, Shumin Zeng1, Hua Zhao1

  • 1College of Chemistry and Chemical Engineering/Film Energy Chemistry for Jiangxi Provincial Key Laboratory (FEC)/Institute of Polymers and Energy Chemistry (IPEC), Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China.

Advanced Materials (Deerfield Beach, Fla.)
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Summary

Researchers developed stretchable organic solar cells (s-OSCs) using dual-phase interface engineering. This strategy improves mechanical compliance and electronic properties, achieving high power conversion efficiencies (PCEs) even under strain.

Keywords:
dual‐phase interface engineeringinterfacial gradient modulusinterlocking conductive elastomer networksstretchable organic solar cells

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Energy Conversion

Background:

  • Stretchable organic solar cells (s-OSCs) require simultaneous improvements in mechanical flexibility and electronic performance.
  • A key challenge is the inherent mechanical mismatch between organic semiconductors and metal electrodes.
  • Existing flexible organic solar cells (f-OSCs) often lack sufficient stretchability for broader applications.

Purpose of the Study:

  • To reconcile the conflicting mechanical and electronic property requirements for s-OSCs.
  • To develop a novel interface engineering strategy for enhanced mechanical adaptability and performance.
  • To establish a generic framework for designing deformable electronic materials.

Main Methods:

  • Implementation of dual-phase interface engineering using molecularly interlocked conductive elastomers.
  • Embedding a 3D interpenetrating conducting elastomer network within the electron transport layer (ETL) for dynamic stress dissipation.
  • Creation of gradient modulus interfaces via Ag coordination-enabled nanocomposite bonding to mitigate mechanical mismatch.

Main Results:

  • Achieved a power conversion efficiency (PCE) of 19.58% in small-area flexible devices, a high value for f-OSCs.
  • Demonstrated remarkable stretchability, retaining over 10% PCE under 100% tensile strain.
  • Successfully fabricated 25 cm² flexible and stretchable modules with PCEs of 16.74% and 14.48%, respectively.

Conclusions:

  • The proposed interface engineering strategy effectively addresses the mechanical mismatch in s-OSCs.
  • The developed technology offers a promising pathway for high-performance, mechanically robust organic solar cells.
  • This work provides new design principles for deformable electronics by synchronizing interfacial dynamics across multiple scales.