Influence of {\alpha}-particles irradiation on the performance and defect levels structure of Al/SiO2/p-type Si surface barrier detector

S. V. Bakhlanov; N. V. Bazlov; D. V. Danilov; A. V. Derbin; I. S. Drachnev; I. M. Kotina; O. I. Konkov; A. M. Kuzmichev; M. S. Mikulich; V. N. Muratova; M. V. Trushin; E. V. Unzhakov

arXiv · 2101.03729

Influence of {\alpha}-particles irradiation on the performance and defect levels structure of Al/SiO2/p-type Si surface barrier detector

S. V. Bakhlanov·N. V. Bazlov·D. V. Danilov·A. V. Derbin·I. S. Drachnev·I. M. Kotina·O. I. Konkov·A. M. Kuzmichev·M. S. Mikulich·V. N. Muratova·M. V. Trushin·E. V. Unzhakov

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Abstract

Deterioration of the operation parameters of Al/SiO2/p-type Si surface barrier detector upon irradiation with alpha-particles at room temperature was investigated. As a result of 40-days irradiation with a total fluence of 8*10^9 {\alpha}-particles, an increase of {\alpha}-peak FWHM from 70 keV to 100 keV was observed and explained by increase of the detector reverse current due to formation of a high concentration of near mid-gap defect levels. Performed CV measurements revealed the appearance of at least 6*10^12 cm-3 radiation-induced acceptors at the depths where according to the TRIM simulations the highest concentration of vacancy-interstitial pairs was created by the incoming {\alpha}-particles. The studies carried out by current-DLTS technique allowed to associate the observed increase of the acceptor concentration with the near mid-gap acceptor level at EV+0.56 eV. This level can be apparently associated with V2O defects recognized previously to be responsible for the space charge sign inversion in the irradiated n-type Si detectors.

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S. V. Bakhlanov, N. V. Bazlov, D. V. Danilov, A. V. Derbin, I. S. Drachnev, I. M. Kotina, O. I. Konkov, A. M. Kuzmichev, M. S. Mikulich, V. N. Muratova, M. V. Trushin, E. V. Unzhakov. 2021-01-11. Influence of {\alpha}-particles irradiation on the performance and defect levels structure of Al/SiO2/p-type Si surface barrier detector. https://arxiv.org/abs/2101.03729

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