Physics – Condensed Matter – Materials Science
Scientific paper
2010-04-04
Physics
Condensed Matter
Materials Science
16 pages, 11 figures
Scientific paper
Operation of semiconductor scintillators requires optically-tight integration of the photoreceiver system on the surface of the scintillator slab. We have implemented an efficient and fast quaternary InGaAsP pin photodiode, epitaxially grown upon the surface of an InP scintillator wafer and sensitive to InP luminescence. The diode is characterized by an extremely low room-temperature dark current, about 1 nA/cm2 at the reverse bias of 2 V. The low leakage makes possible a sensitive readout circuitry even though the diode has a large area (1 mm/times1 mm) and therefore large capacitance (50 pF). Results of electrical, optical and radiation testing of the diodes are presented. Detection of individual \alpha-particles and \gamma-photons is demonstrated.
Abeles Joseph H.
Chan Winston K.
Chen Zhichao
Cheng William
Gouzman Michael
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