Ultrasoft and High-Mobility Block Copolymers for Skin-Compatible Electronics.
basic_science · Level V
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- Record sourced from PubMed, PMID 33314375.
- Also identified by DOI 10.1002/adma.202005416 and PMC identifier 11468703.
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Abstract
Polymer semiconductors (PSCs) are an essential component of organic field-effect transistors (OFETs), but their potential for stretchable electronics is limited by their brittleness and failure susceptibility upon strain. Herein, a covalent connection of two state-of-the-art polymers-semiconducting poly-diketo-pyrrolopyrrole-thienothiophene (PDPP-TT) and elastomeric poly(dimethylsiloxane) (PDMS)-in a single triblock copolymer (TBC) chain is reported, which enables high charge carrier mobility and low modulus in one system. Three TBCs containing up to 65 wt% PDMS were obtained, and the TBC with 65 wt% PDMS content exhibits mobilities up to 0.1 cm<sup>2</sup> V<sup>-1</sup> s<sup>-1</sup> , in the range of the fully conjugated reference polymer PDPP-TT (0.7 cm<sup>2</sup> V<sup>-1</sup> s<sup>-1</sup> ). The TBC is ultrasoft with a low elastic modulus (5 MPa) in the range of mammalian tissue. The TBC exhibits an excellent stretchability and extraordinary durability, fully maintaining the initial electric conductivity in a doped state after 1500 cycles to 50% strain.