Present status and perspectives of the radiation detectors based on InP materials

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2001-02, Vol.458 (1), p.400-405
• Main Authors: Pelfer, P.G., Dubecký, F., Fornari, R., Pikna, M., Gombia, E., Darmo, J., Krempaský, M., Sekáčová, M.
• Format: Article
• Language: English
• Subjects: Detectors; InP; Semi-insulators; X-rays
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/S0168-9002(00)00932-3

Recent results on the electrical properties and detection performances of the semi-insulating InP-based detectors and future programmes are presented. Schottky barrier detectors with a nitride barrier-enhanced interfacial layer and the Schottky back contacts, using material from MASPEC, exhibited a charge collection efficiency (CCE) over 75% and an energy resolution of 4.5% full-width at half-maximum (FWHM) for 5.48 MeV α-particles at RT, CCE over 90% and FWHM less than 3% at 230 K. Furthermore, they are able to detect γ-rays (122 and 60 keV photons) when cooled down to 240 K. New detectors, fabricated with liquid-encapsulated Czochralski material (LEC), produced with a special high-temperature annealing treatment from Japan Energy, coated with an original patented buffer layer and with a symmetrical circular contact configuration using both-sided photolithography and a final electrode metallisation Ti/Pt/Au for both sides, give the best results with a CCE over 88% and a FWHM less than 9% for detection of 122 keV γ-rays.