Characterization of room temperature AlGaAs soft X-ray mesa photodiodes

Barnett, A M, Lioliou, G and Ng, J S (2015) Characterization of room temperature AlGaAs soft X-ray mesa photodiodes. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 774. pp. 29-33. ISSN 0168-9002

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Abstract

Results characterising a set of nine prototype Al0.8Ga0.2As p+–i–n+ mesa photodiodes (400 µm diameter, 1.7 µm i layer) are presented. The results show the performance of the devices as room temperature spectroscopic photon counting soft X-ray detectors. The responses of the photodiodes to illumination with an 55Fe radioisotope X-ray source were measured using a low noise charge sensitive preamplifier; the energy resolutions measured with the devices were consistent with each other and had a mean FWHM at 5.9 keV of 1.27 keV. The devices are the thickest (highest detection efficiency) AlGaAs X-ray spectroscopic mesa photodiodes reported in the literature to date. They also have better energy resolution than all previously reported non-avalanche AlGaAs X-ray detectors of the same area.

Item Type: Article
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Depositing User: Grammatiki Lioliou
Date Deposited: 27 Jan 2016 07:44
Last Modified: 27 Jan 2016 07:44
URI: http://sro.sussex.ac.uk/id/eprint/59433
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