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Charge‐Transport Anisotropy in a Uniaxially Aligned Diketopyrrolopyrrole‐Based Copolymer
Author(s) -
Schott Sam,
Gann Eliot,
Thomsen Lars,
Jung SeokHeon,
Lee JinKyun,
McNeill Christopher R.,
Sirringhaus Henning
Publication year - 2015
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201502437
Subject(s) - materials science , crystallinity , electron mobility , acceptor , charge carrier , copolymer , polymer , organic electronics , electron acceptor , organic semiconductor , chemical physics , optoelectronics , transistor , condensed matter physics , photochemistry , chemistry , physics , composite material , quantum mechanics , voltage
Aligned films of a semiconducting DPP‐based copolymer exhibit highly anisotropic charge transport with a band‐like temperature dependence along the alignment direction and hole mobilities of up to 6.7 cm 2 V −1 s −1 . X‐ray diffraction measurements reveal an exceptional degree of in‐plane alignment, high crystallinity, and a dominant face‐on orientation of the polymer backbones. The surprising charge‐transport properties are interpreted in a tie‐chain model consistent with anisotropic activation energies.
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