Extreme sensitivity displayed by single crystal diamond deep ultraviolet photoconductive devices

Bevilacqua, Mose; Jackman, Richard B
December 2009
Applied Physics Letters;12/14/2009, Vol. 95 Issue 24, p243501
Academic Journal
Deep UV detection using a single crystal diamond (SCD) substrate without a homoepitaxial layer has been demonstrated using a defect passivation treatment. Despite evidence of surface damage on the SCD, the treatments lead to highly effective photoconductive devices, displaying six-orders of discrimination between deep UV and visible light and a responsivity as high as 100 A/W, equivalent to an external quantum efficiency of 700, similar to the best values for devices based on high quality homoepitaxial layers. Impedance spectroscopic investigations suggest that the treatment used reduces the impact of less resistive surface material, most likely defects left from substrate polishing.


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