The time recovery of the spectroscopic properties of heavily irradiated CdZnTe and CdTe detectors |
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Authors: | A Cavallini B Fraboni W Dusi N Auricchio M Zanarini P Chirco |
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Affiliation: | (1) INFM and Dip. di Fisica, Univ. di Bologna, viale Berti Pichat 6/2, Bologna, Italy, IT;(2) Ist.TESRE-CNR, via Gobetti 101, Bologna, Italy, IT;(3) Dip. di Fisica, Univ. di Bologna, viale Berti Pichat 6/2, Bologna, Italy, IT |
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Abstract: | The time recovery of the spectroscopic capabilities of CdZnTe and CdTe detectors, irradiated with increasing doses of high-
and low-energy neutrons, as well as electrons, has been investigated by studying their spectroscopic behavior at different
photon energies using leakage current measurements and PICTS (photo-induced current transient spectroscopy) analysis. The
detectors were stored at room temperature for up to one year to study the time evolution of their spectroscopic performance
and to correlate it with the presence of defective states in the material. We have observed a clear improvement in the material’s
detection properties with time, though only in those detectors which have not been severely degraded by the irradiation. The
recovery can be associated with a decrease in the concentration of some defective states, thus allowing the assessment of
the crucial role these play in determining the charge collection processes in the material and its spectroscopic capabilities.
Received: 1 August 2001 / Accepted: 3 August 2001 / Published online: 20 December 2001 |
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Keywords: | PACS: 07 85 Fv 29 40 Wk 61 82 Fk 72 20 J |
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