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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>
Gladys, Michael J.,O’Donnell, Kane,Tadich, Anton,Yook, Hyunwoo,Han, Jeong Woo,Thomsen, Lars American Chemical Society 2019 The Journal of Physical Chemistry Part C Vol.123 No.34
<P>A detailed understanding of the bonding and molecular geometry characteristics of amino acids on chiral surfaces is vital toward discovering new pathways in chiral chemistry. Saturated layers of <SMALL>D</SMALL>- and <SMALL>L</SMALL>-cysteine amino acids were chemisorbed onto a chiral Cu{421}<SUP>R</SUP> surface. Although very little difference was observed in the molecular orientation of the two enantiomers as observed with near-edge X-ray absorption fine structure, a large variation in the sulfur bond scission energy was measured using a high-resolution X-ray photoelectron spectroscopy thermal annealing sequence. As a result of this scission process, enantiomers of cysteine molecules completely dissociate into alaninate at temperatures separated by as much as 16 K or 0.06 eV which is one of the largest stereo effects observed on chiral metal surfaces.</P> [FIG OMISSION]</BR>