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Charge‐Transport Anisotropy in a Uniaxially Aligned Diketopyrrolopyrrole‐Based Copolymer
Schott, Sam,Gann, Eliot,Thomsen, Lars,Jung, Seok‐,Heon,Lee, Jin‐,Kyun,McNeill, Christopher R.,Sirringhaus, Henning John Wiley and Sons Inc. 2015 Advanced Materials Vol.27 No.45
<P><B>Aligned films of a semiconducting DPP‐based copolymer</B> exhibit highly anisotropic charge transport with a band‐like temperature dependence along the alignment direction and hole mobilities of up to 6.7 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>. 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. </P>