TY  - THES
AU  - Neubueser, Coralie
TI  - Impact of Irradiations by Protons with different Energies on Silicon Sensors
IS  - DESY-THESIS-2013-021
SN  - 1435-8085
PB  - University of Hamburg
VL  - MS
CY  - Hamburg
M1  - DESY-2013-00180
M1  - DESY-THESIS-2013-021
T2  - DESY-THESIS
SP  - 125
PY  - 2013
N1  - University of Hamburg, Masterarbeit, 2013
AB  - 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.
KW  - Unveröffentlichte Hochschulschrift (GND)
LB  - PUB:(DE-HGF)3 ; PUB:(DE-HGF)19 ; PUB:(DE-HGF)15
DO  - DOI:10.3204/DESY-THESIS-2013-021
UR  - https://bib-pubdb1.desy.de/record/152330
ER  -