Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 46: Poster 2

HL 46.1: Poster

Donnerstag, 29. März 2007, 15:00–17:30, Poster A

Studies of diamond surfaces and metallization for detector applications — •Robert Lovrincic¹, Eleni Berdermann², Michal Pomorski², and Annemarie Pucci¹ — ¹Kirchhoff-Institut für Physik der Universität Heidelberg — ²Gesellschaft für Schwerionenforschung Darmstadt

Diamond single crystals have several very favourable characteristics as detector material in high- and low-energy physics experiments. The diamond surface termination and reconstruction play a key role in the device performance. E.g., hydrogen termination gives rise to surface p-conductivity, which is undesirable for detector applications. The surface reconstruction influences the electron affinity and hence the Schottky barrier height of a metal-diamond interface. These properties were studied by means of Fourier transform infrared (FTIR) spectroscopy and low-energy electron diffraction. Another decisive step towards good detector performance is the metallization. Plenty, partially contradictory proposals for the fabrication of electrodes on diamond are published. In the case of diamond detectors however, Chromium-Gold, Titanium-Platinum-Gold and pure Aluminium electrodes are frequently applied. We studied* therefore, chromium film growth on diamond (100) single crystal surfaces by FTIR spectroscopy under ultra high vacuum conditions. This enables us to derive the electrical conductivity of the metal film and of the metal film-diamond interface in a non-destructive, non-contact way.

*Supported by EC Integrated Infrastructure Initiative Hadron Physics, Project RII3-CT-2004-506078