Investigation of the Piezoresistive Properties of Nano Structured Amorphous Carbon for Force Sensor Applications

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In this contribution we report on investigations of the nano structure, morphology and nano topography of amorphous carbon films with respect to the piezo resistive, electrical and mechanical properties. Therefore a-C, a-C:H and doped a-C:H:X films were prepared at different plasma conditions, e.g. substrate bias variation. The films were mechanically characterized by AFM and Hysitron, which was also used for nano topographic investigations. Selected films were investigated by Raman spectroscopy for revealing the sp2 /sp3 bonding ratio.
For investigations of the electrical transport mechanism the carbon films were deposited on n and p-Si wafers. The measurements included resistivity vs temperature plots. Resistivity of the films in general decreases with the increase in temperature. A heterojunction is expected at the film/Si interface. Analysis of the heterojunction leads to the conclusion that the a-C film is of n-type and a-C:H film is of p-type. We propose band diagrams for the a-C:H/p-Si and a-C:H/n-Si heterojunctions.

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Journal: TechConnect Briefs
Volume: 1, Technical Proceedings of the 2006 NSTI Nanotechnology Conference and Trade Show, Volume 1
Published: May 7, 2006
Pages: 800 - 803
Industry sector: Advanced Materials & Manufacturing
Topic: Materials Characterization & Imaging
ISBN: 0-9767985-6-5