Influence of Laser Radiation on Optical Properties of High Resistivity CdTe Crystals and Cd1 – xZnxTe Solid Solutions in the Field of the Fundamental Optical Transition E0

Authors P.O. Gentsar , S.M. Levytskyi
Affiliations

V.E. Lashkaryov Institute of Semiconductor Physics NAS of Ukraine, 41, Prospect Nauki, 03028 Kyiv, Ukraine

Е-mail rastneg@isp.kiev.ua
Issue Volume 12, Year 2020, Number 3
Dates Received 09 January 2020; revised manuscript received 20 June 2020; published online 25 June 2020
Citation P.O. Gentsar, S.M. Levytskyi, J. Nano- Electron. Phys. 6 No 3, 03013 (2020)
DOI https://doi.org/10.21272/jnep.12(3).03013
PACS Number(s) 78.55.Hx, 78.40.Ha, 71.35.Cc
Keywords CdTe (10) , CdZnTe, Transmission (16) , Reflection (7) , Absorption (16) , Laser irradiation.
Annotation

In this paper, the transmission and reflection spectra of р-CdTe (111) single crystals and Cd1 – хZnхTe (х = 0.1) solid solutions in the range (0.8-1.7)·10 – 6 m before and after laser irradiation at the wavelength   355 nm in the energy range 5.8-21.0 mJ/cm2 are measured. It is shown that at optimal parameters of laser processing we obtain an increase in the reflectivity of the investigated materials, which in turn is explained by the integral effect, i.e. both a thin near-surface layer and the volume of material take part in the process of optical reflection (the complex refractive index of the surface layer is different from the complex refractive index of the volume material ). The obtained reflection spectra of the samples indicate that during irradiation there is a laser-stimulated interaction of impurities and defects, which leads to the formation of neutral complexes and a decrease in the intensity of impurity scattering processes. Experimental studies on the effect of laser irradiation on the optical properties of these crystals, and the establishment of the main mechanisms of laser treatment (laser-induced modification) of the near-surface layer are conducted. In р-CdTe (111) single crystals and Cd1 – хZnхTe (х = 0.1) solid solutions, cadmium, tellurium, zinc and their complexes play the role of the getter.

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