The effect of charge collection recovery in silicon p–n junction detectors irradiated by different particles
✍ Scribed by E. Verbitskaya; M. Abreu; P. Anbinderis; T. Anbinderis; N. D'Ambrosio; W. de Boer; E. Borchi; K. Borer; M. Bruzzi; S. Buontempo; L. Casagrande; W. Chen; V. Cindro; B. Dezillie; A. Dierlamm; V. Eremin; E. Gaubas; V. Gorbatenko; V. Granata; E. Grigoriev; S. Grohmann; F. Hauler; E. Heijne; S. Heising; O. Hempel; R. Herzog; J. Härkönen; I. Ilyashenko; S. Janos; L. Jungermann; V. Kalesinskas; J. Kapturauskas; R. Laiho; Z. Li; I. Mandic; Rita De Masi; D. Menichelli; M. Mikuz; O. Militaru; T.O. Niinikoski; V. O'Shea; S. Pagano; V.G. Palmieri; S. Paul; B. Perea Solano; K. Piotrzkowski; S. Pirollo; K. Pretzl; P. Rato Mendes; G. Ruggiero; K. Smith; P. Sonderegger; P. Sousa; E. Tuominen; J. Vaitkus; C. da Viá; E. Wobst; M. Zavrtanik
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 314 KB
- Volume
- 514
- Category
- Article
- ISSN
- 0168-9002
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✦ Synopsis
The recovery of the charge collection efficiency (CCE) at low temperatures, the so-called ''Lazarus effect'', was studied in Si detectors irradiated by fast reactor neutrons, by protons of medium and high energy, by pions and by gamma-rays. The experimental results show that the Lazarus effect is observed: (a) after all types of irradiation; (b) before and after space charge sign inversion; (c) only in detectors that are biased at voltages resulting in partial depletion at room temperature. The experimental temperature dependence of the CCE for proton-irradiated detectors shows non-monotonic behaviour with a maximum at a temperature defined as the CCE recovery temperature. The model of the effect for proton-irradiated detectors agrees well with that developed earlier for detectors irradiated by neutrons. The same midgap acceptor-type and donor-type levels are responsible for the Lazarus effect in detectors irradiated by neutrons and by protons. A new, abnormal ''zigzag''-shaped temperature dependence of the CCE was observed for detectors irradiated by all particles (neutrons, protons and pions) and by an ultra-high dose of g-rays, when operating at low bias voltages. This effect is explained in the framework of the double-peak electric field distribution model for heavily irradiated detectors. The redistribution of the space charge region depth between the depleted regions adjacent to p þ and n þ contacts is responsible for the ''zigzag''-shaped curves. It is shown that the CCE recovery temperature increases with reverse bias in all detectors, regardless of the type of radiation.
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