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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:24 |
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Conference: Bucharest University Faculty of Physics 2015 Meeting
Section: Solid State Physics and Materials Science
Title:
ESR of irradiation point defects in 13C doped Si-FZ single crystals
Authors:
A. C. JOITA (1,2), S. V. NISTOR (1), D. GHICA (1), I. PINTILIE (1)
Affiliation:
1)National Institute of Materials Physics, Magurele, Ilfov, Romania
2)University of Bucharest, Faculty of Physics, Magurele, Ilfov, Romania
E-mail
alexandra.joita@infim.ro
Keywords:
electron spin resonance, silicon, radiation dectors
Abstract:
The upgrade of Hadron Collider (LHC) at CERN to High Luminosity LHC (HL-LHC) will lead to high doses of radiation at the tracking detectors. Physical experiments require new radiation detectors to be able to work with HL-LHC, because of the present limitations caused by irradiation damage of the silicon sensors. We studied the role of carbon impurity atoms in the formation and structure of the irradiation paramagnetic point defects (IPPDs) in crystalline silicon used to produce new tracking detectors for HL-LHC. The investigations were performed by electron spin resonance (ESR) spectroscopy in Q-band (34 GHz) from room temperature down to 20 K on n-type silicon (FZ-Wacker) doped with 13C and irradiated at high doses of 27 MeV electrons. New anisotropic ESR spectra were observed during in-situ optical excitation at different temperatures. Further changes in the ESR spectra took place after thermal annealing from 150 oC up to 300 oC in steps of 50 degrees. The ESR spectra recorded at low and high microwave power levels, with the magnetic field in a (110) plane, where quantitatively analyzed and resulted in the identification of several IPPDs, characterized by different spin Hamiltonian parameters and local symmetry. Structural models of the resulting IPPDs are proposed and used to explain the observed changes in the ESR spectra of the samples.
References:
[1] R. Radu, E. Fretwurst, R. Klanner, G. Lindstroem, I. Pintilie, Nucl. Instrum. & Meth. Phys. Res. A730, 84 (2013);
[2] S. V. Nistor, D. Ghica, I. Pintilie, E. Manaila, Rom. Repts. Phys. 65, 812 (2013).
Acknowledgement:
This work has been performed in the framework of the PNII-ID-PCE-2011-3 Nr. 72/5.10.2011
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