Radiation-Induced Surface Conductivity in an Alkaline-Earth Boroaluminosilicate Glass Measured with Elevated-Temperature Scanning Probe Microscopy
Abstract:A 50 mW 325 nm He:Cd laser was used to irradiate the fracture surface of a commercial alkaline-earth boroaluminosilicate display glass (Corning Code 1737) held at temperatures above 800 K. After this treatment, the surface of the glass was found to be conductive for several hours in a temperature range between room temperature and 850 K. The conductivity shows an activation energy of 0.18 eV. Scanning tunneling spectroscopy measurements indicate that the glass surface is semiconducting with a bandgap of ∼4.4 eV. It is possible to form topographical images of the surface of the glass using the electron tunneling current; the observed topography corresponds to that acquired using atomic force imaging from the same area.
Document Type: Research Article
Affiliations: Department of Materials Science and Engineering, Cornell University, Ithaca, New York
Publication date: 2005-09-01