Regensburg 2002 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 15: Poster: Dünne Filme, Monolagen und Oberfl
ächen
CPP 15.5: Poster
Mittwoch, 13. März 2002, 16:30–18:00, B
Electrochemical Passivation of Gallium Arsenide with Biphenylthiol Monolayers — •Klaus Adlkofer1, Wolfgang Eck2, Michael Grunze2, and Motomu Tanaka1 — 1Technische Universität München, Lehrstuhl füe Biophysik, James-Franck-Str., 85748 Garching — 2Universität Heidelberg, Angewandte Physikalische Chemie, Im Neuenheimer Feld 253, 69120 Heidelberg
Biocompatible, functional interlayers between semiconductors and biological materials have numerous scientific and practical applications. Although gallium arsenide (GaAs) has been claimed to realize high sensitive devices due to their high electron mobility in nano-structures, the complex electrochemical processes at the GaAs/electrolyte interface have impeded the functional modification of GaAs-based devices. To avoid surface degradation under physiological conditions, self-assembled monolayers of biphenylthiol (BPT) were deposited onto GaAs [100] surfaces. The homogeneity of the surface coating was checked by AFM and contact angle measurements. The rms roughness of the monolayer-coated surface was comparable to that of the freshly prepared GaAs surface. Electrochemical properties of the monolayers were monitored by cyclic voltammetry and impedance spectroscopy, exhibiting a significant stability at a wide potential range. Such a stable surface coating will be transferred onto the surface of various nano-structures such as near-surface quantum dots.