用全息相衬显微术对CdTe晶体生长的研究

本文首次探讨并应用全息相衬显微术来研究晶体的高温气相生长动力学.在晶体生长、溶解及不同过饱和度下,观测并记录了CdTe晶体界面的真实扩散层及变化规律,并结合扩散层模型给予了讨论.摸索了提高像质及再现象分辨率的条件.

DYNAMICS STUDY ON CdTe SINGLE CRYSTAL GROWTH BY HOLOGRAPHIC PHASE-CONTRAST MICROPHOTOGRAPHY

The high purity and high quality CdTe single crystals were grown by the sublimation method either under excess Te of less than 0.02% or not.In this paper, the holographic phase-contrast microphotography is introduced to the research of high temperature growth of single crystal for the first time. The growth ampoul and furnace with parallel windows were designed.The principle of this technique was discussed and the efforts were made to obtain the experiment conditions for best results. Three-dimensional observing and. recording of the growth process in real time were obtained, and an accuracy of 3.9μm was achieved.The boundary layers were recorded under both growth and dissolution processes as well as various superaturation ΔT, which is the temperature differ onee between crystal and source. The results suggested that the absorption layer become thicker with, the ΔT increasing.