Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5366418 | Applied Surface Science | 2007 | 5 Pages |
Abstract
Metal-semiconductor diode of Au/n-GaAs is studied under the irradiation of swift heavy ion (SHI) beam (80 MeV 16O6+), using in situ current-voltage characterization technique. The diode parameters like ideality factor, barrier height, and leakage current are observed to vary with irradiation fluence. Significantly, the diode performance improves at a high fluence of 2 Ã 1013 ions cmâ2 with a large decrease of reverse leakage current in comparison to the original as deposited sample. The Schottky barrier height (SBH) also increases with fluence. At a high irradiation fluence of 5 Ã 1013 ions cmâ2 the SBH (0.62 ± 0.01 eV) is much larger than that of the as deposited sample (0.55 ± 0.01 eV). The diode parameters remain stable over a large range of irradiation up to fluence of 8 Ã 1013 ions cmâ2. A prominent annealing effect of the swift ion beam owing to moderate electronic excitation and high ratio of electronic energy loss to the nuclear loss is found to be responsible for the improvement in diode characteristics.
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Authors
A. Tarun Sharma, Shahnawaz Shahnawaz, Sandeep Kumar, Yashpal S. Katharria, Dinakar Kanjilal,