Regensburg 2010 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 16: Diamond

HL 16.6: Talk

Monday, March 22, 2010, 17:15–17:30, H13

Spatially resolved photoconductance of oxygen barriers on hydrogenated single crystalline diamond — •Max Seifert, Markus Stallhofer, Moritz Hauf, Gerhard Abstreiter, José A. Garrido, and Alexander W. Holleitner — Walter Schottky Institut, Technische Universität München, Am Coulombwall 3, 85748 Garching, Germany

Undoped single crystalline hydrogen-terminated diamond exhibits a p-type surface conductivity. This surface conductivity originates from a two dimensional hole gas formed due to a band bending beneath the surface. An oxygen-terminated diamond surface, however, shows no surface conductivity and therefore, thin lines with oxygen-termination can be used to form tunneling barriers within the two dimensional hole gas. We create such barriers with a lithographic width down to 50 nm by electron-beam lithography. In spatially resolved photocurrent measurements, we demonstrate that the devices can be exploited for photodetector applications at room temperature.