Thermally stable visible-blind diamond photodiode using tungsten carbide Schottky contact

Meiyong Liao; Koide, Yasuo; Alvarez, Jose
July 2005
Applied Physics Letters;7/11/2005, Vol. 87 Issue 2, p022105
Academic Journal
We have developed a thermally stable, deep-ultraviolet (DUV) photodiode using tungsten carbide (WC) Schottky and Ti/WC ohmic contacts for a boron-doped homoepitaxial p-diamond epilayer. Effects of thermal annealing in an argon ambient on the electrical and photoresponse properties were investigated. Annealing at temperatures up to 550 °C improves the rectifying current-voltage characteristics, resulting in a dramatic enhancement of DUV responsivity at 220 nm by a factor of 4×103. A blind ratio as large as 105 between DUV and visible light has been achieved at a reverse bias as small as 1 V. Development of the thermally stable WC-based Schottky and ohmic contacts provides a route for stable operation of a diamond photodetector at high temperatures.


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