Impact of Irradiations by Protons with different Energies on Silicon Sensors

Neubueser, Coralie

Book/Master Thesis/Internal Report

DESY-2013-00180

Impact of Irradiations by Protons with different Energies on Silicon Sensors

Neubueser, C. (Corresponding author)Extern*

2013
DESY Hamburg

Hamburg : DESY, DESY-THESIS 125 pp. (2013) [10.3204/DESY-THESIS-2013-021] = University of Hamburg, Masterarbeit, 2013

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Please use a persistent id in citations: doi:10.3204/DESY-THESIS-2013-021

Report No.: DESY-THESIS-2013-021

Abstract: In the frame of the CMS tracker upgrade campaign the radiation damage of oxygen- rich n-type silicon pad diodes induced by 23 MeV and 23 GeV protons was investigated. The diodes were manufactured by Hamamatsu Photonics. After irradiation with 1 MeV neutron equivalent fluences between 1 × 10^11 cm−2 and 1.5 × 10^15 cm−2, the sensors were electrically characterized by means of capacitance-voltage (CV) and current-voltage (IV) measurements. Current pulses recorded by the Transient Current Technique (TCT) and Charge Collection Efficiency (CCE) measurements show a dependence of the bulk damage on the proton energy.At a fluence of Φeq ≈ 3 × 10^14 cm−2 oxygen-rich n-type diodes demonstrate clear Space Charge Sign Inversion (SCSI) after 23 MeV proton irradiation. This effect does not appear after the irradiation with 23 GeV protons. Moreover, RD50 pad diodes were irradiated with 23 MeV protons, electrically characterized and compared to results obtained after 23 GeV irradiations. Our previous observation on the energy dependence of the radiation damage could be confirmed. In order to get a deeper understanding of the differences of the radiation induced defects, the Deep Level Transient Spectroscopy (DLTS) and Thermally Stimulated Current Technique (TSC) were utilized. Defects with impact on the space charge could be identified and characterized and it was possible to find some hints for the reason of the SCSI after 23 MeV proton irradiation. Moreover, a dependence on the oxygen concentration of the sensors could be observed.

Keyword(s): Unveröffentlichte Hochschulschrift

Note: University of Hamburg, Masterarbeit, 2013

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Appears in the scientific report 2013

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