X ray diamond 2D array

X-ray 2D array detectors based on polycrystalline diamond have been fabricated and tested in the dark and under low energy X-ray beams, as well as under UV laser pulses. Depending on the metallic contacts distance or crossover-area, each pixel exhibit low dark current values down to 2 pA and light to dark current ratio as large as 20 when biased at 50 V. The intensity dependence of X-ray photocurrent, as measured for different thickness of Al absorbers, changes according the square root of the beam intensity, thereby suggesting a good crystalline quality of the used diamond slab. A similar behaviour is found when UV laser pulses of high energy are used for device irradiation. At lower energies, a larger photocurrent change with the beam intensity is found, eventually becoming a linear dependence. Such a result confirms the expected good diamond sample quality and suggests a device use for X-ray beam profiler with a large dynamics. The diamond sample and detector uniformity has been also tested under UV laser pulses. The observed pixel response uniformity further support the possible device application as image sensor