Abstract
The diffusion behaviour near the surface for gold and bismuth in cadmium telluride has been investigated by the charged particle Rutherford back-scattering and ion microprobe analysis techniques in the temperature range 200°–450°C. For all temperatures above 370°C penetration saturation effects are observed. Preliminary results for the activation energy (1.7 eV for gold, 0.3-0.4 eV for bismuth) and diffusion constants D0 are presented. For comparable temperatures, a much more rapid diffusion of gold occurs in evaporated layers of cadmium telluride than in the crystalline case. It further appears that for near-surface diffusion (<1000 A) the back-scattering technique is more useful, with its higher resolution and its ability to give information on atom location, than the ion microprobe. However, the latter technique shows advantages when information from greater depths is required.
Published Version
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