Solution-Assembled Blends of Regioregularity-Controlled Polythiophenes for Coexistence of Mechanical Resilience and Electronic Performance

Hyeong Jun Kim, Moo Yeol Lee, Jin Seong Kim, Jae Han Kim, Hojeong Yu, Hongseok Yun, Kin Liao, Taek Soo Kim, Joon Hak Oh, Bumjoon J. Kim

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Considering all the potential applications of organic electronics in portable, wearable, and implantable devices, it is of great importance to develop electroactive materials that possess mechanical reliability along with excellent electronic performance. The coexistence of these two attributes, however, is very difficult to achieve because there is an inverse relationship between the electrical properties and the mechanical flexibility, both of which are associated with the conjugation length and intermolecular ordering of the polymers. Herein, we demonstrate a simple and robust approach based on solution assembly of two different poly(3-hexylthiophene)s (P3HTs) with regioregularity (RR) contents of 97% and 66% to impart both electrical and mechanical properties to films for organic electronic applications. The 97% RR P3HT exhibits high electronic performance but poor mechanical resilience, and vice versa for the 66% RR P3HT. Selective crystallization of high RR P3HT induced by solution assembly allows the use of a one-step process to construct percolated networks of high RR P3HT nanowires (NWs) in a low RR P3HT matrix. Only 5 wt % of high RR P3HT NWs in a 95 wt % low RR P3HT matrix was required to produce hole mobilities comparable to that of pure high RR P3HT, and this blend film exhibited improvements by factors of 20 and 60 in elongation at break and toughness, respectively. Selective self-assembly of RR-controlled polymers allowed us to overcome the fragile nature of highly crystalline conjugated polymer films without sacrificing their electronic properties.

Original languageBritish English
Pages (from-to)14120-14128
Number of pages9
JournalACS Applied Materials and Interfaces
Volume9
Issue number16
DOIs
StatePublished - 26 Apr 2017

Keywords

  • mechanical stability
  • nanowire
  • regioregularity
  • solution assembly
  • stretchable organic electronics

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