Abstract
The inherent properties of diamond make it an ideal material for radiation detectors. In this Letter, two ( 100 ) -textured CVD diamond films with different quality were obtained by using a hot filament chemical vapor deposition (HFCVD) technique to fabricate as X-ray detectors. 5.9 keV X-rays were used to investigate the photocurrent and charge collection efficiency of the detectors. For the CVD diamond detector based on the film with larger grain size, the electrical contact is a fine ohmic for bias voltage up to 100 V, and the darkcurrent of ∼ 16.3 nA and the photocurrent of ∼ 16.8 nA are obtained at an electrical field of 50 kV cm −1. The average charge collection efficiency of ∼ 45.1 % corresponding to the charge collection distance (CCD) value of 9.0 μm is achieved.
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