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ε ‐Branched Flexible Side Chain Substituted Diketopyrrolopyrrole‐Containing Polymers Designed for High Hole and Electron Mobilities
Author(s) -
Han AReum,
Dutta Gitish K.,
Lee Junghoon,
Lee Hae Rang,
Lee Sang Myeon,
Ahn Hyungju,
Shin Tae Joo,
Oh Joon Hak,
Yang Changduk
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201403020
Subject(s) - materials science , side chain , branching (polymer chemistry) , polymer , electron mobility , stacking , lamellar structure , conjugated system , semiconductor , amorphous solid , field effect transistor , transistor , organic semiconductor , optoelectronics , polymer chemistry , chemical physics , crystallography , organic chemistry , chemistry , electrical engineering , voltage , composite material , engineering
Based on the integrated consideration and engineering of both conjugated backbones and flexible side chains, solution‐processable polymeric semiconductors consisting of a diketopyrrolopyrrole (DPP) backbone and a finely modulated branching side chain ( ε ‐branched chain) are reported. The subtle change in the branching point from the backbone alters the π−π stacking and the lamellar distances between polymer backbones, which has a significant influence on the charge‐transport properties and in turn the performances of field‐effect transistors (FETs). In addition to their excellent electron mobilities (up to 2.25 cm 2 V −1 s −1 ), ultra‐high hole mobilities (up to 12.25 cm 2 V −1 s −1 ) with an on/off ratio ( I on / I off ) of at least 10 6 are achieved in the FETs fabricated using the polymers. The developed polymers exhibit extraordinarily high electrical performance with both hole and electron mobilities superior to that of unipolar amorphous silicon.