The results of electrical characterisation and X-ray detection measurements of two different active area (0.06 mm2 and 0.5 mm2) commercial 4H-SiC Schottky photodiodes at room temperature are reported. The devices exhibited low dark currents (less than 10 pA) even at a high electric field strengths (403 kV/cm for 0.06 mm2 diodes; 227 kV/cm for 0.5 mm2 diodes). The results of the X-ray measurements indicate that the diodes can be used as photon counting spectroscopic X-ray detectors with modest energy resolutions: FWHM at 5.9 keV of 1.8 keV and 3.3 keV, for the 0.06 mm2 and 0.5 mm2 devices, respectively. Noise analysis of the photodiodes coupled to a custom low noise charge sensitive preamplifier is also presented.
Funding
Royal Society; RG130515
In situ X-ray Fluorescence Spectroscopy for Deep Sea Mining Applications; G1537; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/M004635/1
High Efficiency Betavoltaic Cells; G1455; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/M002772/1
History
Publication status
Published
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Published version
Journal
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment