Unravelling the Correlation between Charge Mobility and Cocrystallization in Rod–Rod Block Copolymers for High-Performance Field-Effect Transistors

Mingjing Zhu, Shuang Pan, Yue Wang, Ping Tang, Feng Qiu, Zhiqun Lin, Juan Peng

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Cocrystallization involving two or more components aggregating into cocrystals allows the preparation of materials with markedly improved charge mobility. This approach however, is little explored in all-conjugated block copolymers (BCPs). Herein, we report the first investigation into the correlation between cocrystals and charge mobility in a series of new all-conjugated BCPs: poly(3-butylthiophene)-b-poly(3-hexylselenophene) (P3BT-b-P3HS) for high-performance field-effect transistors. These rationally synthesized rod–rod BCPs self-assemble into cocrystals with high charge mobilities. Upon one-step thermal annealing, their charge mobilities decrease slightly despite their increased crystallinities. After two-step thermal annealing, P3BT-b-P3HS (P3BT/P3HS=2:1) and (1:1) cocrystals disappear and phase separation occurs, leading to greatly decreased charge mobilities. In contrast, P3BT-b-P3HS (1:2) retains its cocrystalline structure and its charge mobility.

Original languageEnglish
Pages (from-to)8644-8648
Number of pages5
JournalAngewandte Chemie - International Edition
Volume57
Issue number28
DOIs
StatePublished - 9 Jul 2018

Bibliographical note

Funding Information:
This work was financially supported by the National Natural Science Foundation of China (Grant NOs. 21674024, 21320102005) and Ministry of Science and Technology of China (2016YFA0203301). Z.L. acknowledges the Senior Visiting Scholarship of State Key Laboratory, Fudan University. We gratefully acknowledge the support from Shanghai Synchrotron Radiation Facility of China for using the BL14B1 and BL16B1 beamlines.

Publisher Copyright:
© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • cocrystallization
  • copolymers
  • organic field-effect transistors (OFETs)
  • polyselenophenes
  • rod–rod block copolymer

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