Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 46: Poster Session IV
CPP 46.58: Poster
Mittwoch, 14. März 2018, 11:00–13:00, Poster A
Flexible Modulation of Electronic Band Structures of Wide Band Gap GaN Semiconductors Using Bioinspired, Non-Biological Helical Peptides — •Sven Mehlhose1, Natalya Frenkel1, Wasim Abuillan1, Sara Lippert3, Gesche Müntze3, Martin Eickhoff3, Shunsaku Kimura2, and Motomu Tanaka1 — 1Physical Chemistry of Biosystems, Institute of Physical Chemistry, Heidelberg University, D69120 Heidelberg, Germany — 2Department of Material Chemistry, Graduate School of Engineering, Kyoto University, 6158510 Kyoto, Japan — 3Institut für Festkörperphysik, Universität Bremen, Otto-Hahn-Allee, D28359 Bremen
We show the modulation of the electronic band profiles of wide band gap GaN semiconductors by the macromolecular dipole potentials exerted from ordered monolayers of synthetic, non-biological aldehyde terminated helical peptides deposited on wet chemically oxidized GaN surfaces functionalized with aminosilanes. The selective coupling of either N- or C-terminal to the amino-terminated surface enables one to control the direction of the dipole moment. After confirming the formation of highly ordered peptide monolayers, the impact of macromolecular dipole potentials was quantified by electrochemical impedance spectroscopy. The same functionalization steps were transferred to GaN/AlGaN/GaN high electron mobility transistor structures. Stable and quantitative modulation of the current-voltage characteristics of the two-dimensional electron gas by the deposition of bio-inspired peptides is a promising strategy for the macromolecular dipole engineering of GaN semiconductors.