AlInP photodiode X-ray detectors

Zhao, Shifan, Butera, Silvia, Lioliou, Grammatiki, Krysa, Andrey and Barnett, Anna (2019) AlInP photodiode X-ray detectors. Journal of Physics D: Applied Physics. ISSN 0022-3727

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Four Al0.52In0.48P p+-i-n+ mesa photodiodes with 6 μm thick i layers and two different diameters (217 μm ± 15 μm and 409 μm ± 28 μm) were studied at room temperature (24 °C). Electrical characterisation measurements are reported along with measurements showing the performance of the devices as X-ray detectors. The devices exhibited leakage currents < 3 pA (corresponding to leakage current densities < 2 nA/cm2) at 100 V reverse bias (electric field strength of 167 kV/cm). The photodiodes were coupled to a custom-made low-noise charge-sensitive preamplifier, the noise characteristics of the resultant spectrometers were investigated as functions of shaping times. The best energy resolutions (full width at half maximum of the 5.9 keV photopeak from an 55Fe radioisotope X-ray source) achieved with the 217 μm ± 15 μm and 409 μm ± 28 μm diameter photodiodes were 0.89 keV and 1.05 keV, respectively. The dielectric dissipation factor of Al0.52In0.48P was estimated to be (2.2 ± 1.1) × 10-3 at room temperature.

Item Type: Article
Keywords: X-ray spectroscopy; Photodiode; Aluminium indium phosphide; Dielectric dissipation factor
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Depositing User: Shifan Zhao
Date Deposited: 08 Mar 2019 08:47
Last Modified: 08 Mar 2019 08:56

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Project NameSussex Project NumberFunderFunder Ref
Photon counting X-ray and gamma-ray spectroscopy with Al0.52In0.48P detectorsG2140EPSRC-ENGINEERING & PHYSICAL SCIENCES RESEARCH COUNCILEP/P021271/1
2016 Philip Leverhulme PrizeUnsetLeverhulme TrustUnset