[PDF]     http://dx.doi.org/10.3952/lithjphys.51308

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 51, 230–236 (2011)


FLUENCE DEPENDENT VARIATIONS OF BARRIER CHARGING AND GENERATION CURRENTS IN NEUTRON AND PROTON IRRADIATED Si PARTICLE DETECTORS
E. Gaubas, T. Čeponis, S. Sakalauskas, A. Uleckas, and A. Velička
Vilnius University Institute of Applied Research, Saulėtekio 9 bldg. 3, LT-10222 Vilnius, Lithuania
E-mail: eugenijus.gaubas@ff.vu.lt

Received 1 June 2011; revised 19 September 2011; accepted 21 September 2011

The stability of the potential barrier is an essential characteristic in high energy particle detector operation under irradiation conditions. In this work a technique for barrier evaluation by linearly increasing voltage (BELIV) is presented, based on analysis of current transients measured at reverse biasing. The technique has been applied to diodes irradiated by neutrons and protons with fluences in the range of 1012–1016 cm−2 in 1 MeV neutron equivalent. Fluence and temperature dependent characteristics of the diode barrier capacitance as well as of generation current are discussed.
Keywords: charge extraction currents, junction barrier, generation current, radiation defects
PACS: 72.20.Jv, 71.55.Eq


BARJERINĖS TALPOS IR GENERACINĖS SROVĖS KITIMAI NEUTRONAIS IR PROTONAIS APŠVITINTUOSE Si DALELIŲ DETEKTORIUOSE
E. Gaubas, T. Čeponis, S. Sakalauskas, A. Uleckas, A. Velička
Vilniaus universiteto Taikomųjų mokslų institutas, Vilnius, Lietuva

Aukštųjų energijų spinduliuotės detektorių sandūrų potencinio barjero stabilumas kintant apšvitos įtėkiui yra viena esminių tokių detektorių funkcinių charakteristikų. Šiame darbe yra pateikta barjero įvertinimo tiesiškai didėjančios įtampos impulsinė metodika (BELIV), pagrįsta srovių kinetikų analize. Šis metodas buvo pritaikytas Si dalelių detektorių, apšvitintų skvarbiaisiais protonais bei 1 MeV energijos ekvivalento neutronais 1012–1016 cm−2 įtėkių srityje, barjerinės talpos bei generacinės srovės kaitos įvertinimams. Aptarta barjerinės talpos ir generacinės srovės charakteristikų priklausomybė nuo apšvitos įtėkio, temperatūros, nuostovaus pašvietimo.

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