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Study of bulk damage in high resistivity silicon detectors irradiated by high dose of 60Co γ-radiation

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3 Author(s)
Li, Z. ; Brookhaven Nat. Lab., Upton, NY, USA ; Li, C.J. ; Verbitskaya, E.

Displacement damage (or bulk damage) induced by high dose (>200 Mrad) γ-radiation in high resistivity (6-10 kΩ-cm) silicon detectors has been studied. It has been found that detector bulk leakage current increases with γ dose at a rate of 3.3×10-7 A/cm3/Mrad. This damage rate of bulk leakage current originates from the introduction of generation centers and at a dose of 210 Mrad of γ-radiation is comparable to that induced by 1×1012 n/cm2 of neutron radiation. Nearly 100% donor removal and/or compensation was found in detectors irradiated to 215 Mrad. Space charge sign inversion (SCSI) was observed in detectors irradiated to ⩾215 Mrad using the transient current technique (TCT). As many as six deep levels have been observed by current deep level transient spectroscopy (I-DLTS). There was insignificant annealing and no reverse annealing even after elevated temperature treatment for detectors irradiated to 215 Mrad. A small amount of reverse annealing (10 to 15%) has been observed during the room temperature storage period of about 11 months for detectors irradiated to 500 Mrad

Published in:

Nuclear Science, IEEE Transactions on  (Volume:44 ,  Issue: 3 )

Date of Publication:

Jun 1997

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