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Ultrasoft and High-Mobility Block Copolymers for Skin-Compatible Electronics.

Kristina Ditte1,2, Jonathan Perez3,4, Soosang Chae1

  • 1Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden, 01069, Germany.

Advanced Materials (Deerfield Beach, Fla.)
|December 14, 2020
PubMed
Summary

Researchers developed a new polymer semiconductor triblock copolymer (TBC) by covalently linking semiconducting poly-diketo-pyrrolopyrrole-thienothiophene (PDPP-TT) and elastomeric poly(dimethylsiloxane) (PDMS). This breakthrough material offers high charge carrier mobility and exceptional stretchability for advanced electronics.

Keywords:
block copolymersorganic field-effect transistorsskin-compatible electronicsstretchable organic electronics

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Electronics

Background:

  • Polymer semiconductors (PSCs) are crucial for organic field-effect transistors (OFETs).
  • Existing PSCs often lack the flexibility and durability required for stretchable electronics due to brittleness.
  • Developing materials that combine high electronic performance with mechanical resilience is a key challenge.

Purpose of the Study:

  • To create a novel triblock copolymer (TBC) integrating a high-performance semiconducting polymer with an elastomer.
  • To achieve a material with both high charge carrier mobility and excellent mechanical stretchability.
  • To overcome the limitations of traditional polymer semiconductors in strain-intensive applications.

Main Methods:

  • Synthesis of three triblock copolymers (TBCs) by covalently linking poly-diketo-pyrrolopyrrole-thienothiophene (PDPP-TT) and poly(dimethylsiloxane) (PDMS).
  • Characterization of TBCs with varying PDMS content (up to 65 wt%).
  • Evaluation of electronic properties (charge carrier mobility) and mechanical properties (elastic modulus, stretchability, durability).

Main Results:

  • TBCs with up to 65 wt% PDMS were successfully synthesized.
  • The TBC with 65 wt% PDMS achieved charge carrier mobilities up to 0.1 cm²/V·s, nearing that of the pure PDPP-TT (0.7 cm²/V·s).
  • The TBC demonstrated an ultrasoft elastic modulus (5 MPa), comparable to mammalian tissue, and maintained conductivity after 1500 cycles at 50% strain.

Conclusions:

  • The developed TBC effectively combines high charge carrier mobility with exceptional stretchability and durability.
  • This new material represents a significant advancement for the development of flexible and wearable organic electronics.
  • The covalent linkage strategy provides a viable pathway for designing advanced polymer semiconductors for demanding applications.