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HL: Halbleiterphysik

HL 16: GaN: Bauelemente

HL 16.5: Vortrag

Dienstag, 9. März 2004, 11:15–11:30, H13

Biofunctionalization of AlGaN surfaces — •Barbara Baur, Georg Steinhoff, Martin Hermann, Oliver Purrucker, Motomu Tanaka, Martin Stutzmann, and Martin Eickhoff — Walter Schottky Institut, TU München, D-85748 Garching

Biosensor applications of semiconductor devices for operation in aqueous electrolyte solutions are a current topic of intense research. Wide bandgap semiconductors, such as group III-nitrides are regarded as promising candidates for these applications as they combine high chemical inertness with optical transparency and low thermal noise. To combine those materials with organic systems, a detailed understanding as well as experimental techniques for the realization and control of the anorganic/ organic interface are a basic requirement.

We have investigated the functionalization of AlGaN surfaces by deposition of self-assembled monolayers (SAMs) based on silanes (silanization) for subsequent formation of lipid membranes. Silanization is performed by a self-assembly process from an organic solution of silane molecules. During the silanization process, hydroxyl groups which are formed on oxidic surfaces and act as covalent coupling sites for alkylsilane have to be provided. Thermally and chemically oxidized AlGaN surfaces are compared with respect to their efficiency in the silanization process. We have applied X-ray photoelectron spectroscopy (XPS) and contact angle measurements to characterize the SAM formation and to investigate the properties (coverage, hydrophobicity) of the functionalized layer.