STRUCTURAL CHANGES IN CdTe SINGLE CRYSTALS UPON IRRADIATION WITH HEAVY IONS OF INDERENT GASES

Abstract

The paper presents the results of studies on the production of a polycrystalline or amorphous layer by irradiation of single-crystalline cadmium telluride with ions of inert gases differing in radii. The influence of the ion radius on the resistivity and structure of the (111) layer of a single crystal of cadmium telluride has been studied. The samples were irradiated with neon, argon and xenon ions with radii of 38, 71 and 108 picometers (10-12 m), respectively. The radiation dose for all ions was 250 Mrad. It has been shown that ions with a large radius have the strongest influence on structural transformations; at the same dose (250 Mrad), the drop in intensity of the (111) reflection under the influence of xenon ions is twice as high as that of neon ions. In accordance with X-ray data, as the radius of the ion increases, the resistivity increases, and the larger the radius of the ion, the greater the rate of increase r. Irradiation transforms a single crystal into a polycrystalline state with the formation of a large number of defects, which are sources of current carrier capture, which leads to an increase in r. The increasing growth of r with increasing ion radius is apparently due to the fact that ions with a larger radius have a significantly larger effective cross section for interaction with the crystal.