LPE growth of Hg_(1-x)Cd_xTe heterostructures from Te-rich solutions

摘要

The successful fabrication of long wavelength Hg_(1-y)Cd_yTe/Hg_(1-x)Cd_xTe heterostructures (y > x) on semi-insulating (111)CdZnTe substrates is presented. The heterostructures consist of a thin 2-5-mu m layer on n-type 10-15-mu m thick HgCdTe epilayer. A novel tipping boat for liquid phase epitaxial growth of mercury cadmium telluride from Te-rich solutions has been proposed. The characterization of double-layer heterostructures was carried out using different methods: microscopic examinations; infrared microscopic transmission, and scanning electron microscopic measurements. Electrical properties were measured in temperature range of 77-300 K using the Van der Pauw arrangement. By optimizing the growth parameters and the construction of graphite boat it was possible to obtain high quality, relatively abrupt Hg_(1-x)Cd_xTe heterostructures.