Optimization of Cadmium Zinc Telluride Crystal Physical Parameters by Nanosecond Laser
2015
Edvīns Daukšta

Defending
09.09.2015. 13:00, MLĶF, Paula Valdena ielā 3, 271. auditorijā

Supervisor
Artūrs Medvids, Aleksandrs Mičko

Reviewers
Andris Ozols, Uldis Rogulis, Laima Trinklere

A comprehensive study of pulsed laser influence on CdZnTe crystal physical properties after irradiation by the nanosecond laser is presented in this doctoral thesis. The main focus of doctoral thesis is to investigate dependence of laser parameters on the physical properties of the CdZnTe crystal: different wavelength, pulse duration, intensity and dose. The practical significance of this doctoral thesis is to developed laser technology for CdZnTe crystal preparation for radiation detector applications. It was proven that CdZnTe crystal sustain γ-radiation better after preirradiation with highly absorbing laser. This is due to the generation end redistribution of intrinsic point defects in temperature gradient field. The mechanism of CdZnTe γ-radiation hardness enhancement is proposed. Moreover, it was proven that high intensities of highly absorbing laser radiation leads to the formation of CdTe/CdZnTe heterostructure and the effects are based on the drift of zinc atoms in to the volume of the crystal and cadmium atoms to the surface due to the temperature gradient field. Furthermore, it is possible to reduce residual impurities and dissolve indium secondary phases by weakly absorbing laser radiation due to the generation of temperature gradient field around tellurium inclusions. Experimental results are discussed and explained in context of scientific literature. The thesis is written in the English, its volume is 99 pages. The doctoral thesis includes 53 figures, 6 tables, 51 equations and 114 references.


Keywords
CdZnTe, laser

Daukšta, Edvīns. Optimization of Cadmium Zinc Telluride Crystal Physical Parameters by Nanosecond Laser. PhD Thesis. Rīga: [RTU], 2015. 99 p.

Publication language
English (en)
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