High-temperature performances of diamond-based UV-photodetectors

Abstract

Abstract Self-supported CVD diamond films having coplanar contacts spaced down to 100 μm have been characterized in the temperature range 300–600 K by electrical measurements in the dark and under illumination at λ=220 nm. Up to 600 K the dark conductivity values are smaller than 10−9 S cm−1 and spectrally resolved photocurrent yield measurements in the range 200–800 nm exhibit more than four orders of magnitude discrimination between intrinsic (below 230 nm) and extrinsic (above 230 nm) photoresponses. A thermal activation of the UV photoresponse is also observed, giving an average temperature coefficient for intrinsic photoresponses around 1%/°C.