THE EFFECT OF THERMAL DESORPTION OF WATER ON SURFACE STATES ON GERMANIUM IN ULTRAHIGH VACUUM.
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY AND MATERIALS SCIENCE
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Large signal alternating current field effect experiments in the dark and under illumination were carried out on real germanium surfaces following a heat treatment in ultrahigh vacuum. After prolonged heating about 10 hours at 520 degrees K, the surfaces were slightly p-type, exhibiting 3 to 5 times higher density of traps than prior to heating. Higher temperatures 560 degrees K, 600 degrees K and 640 degrees K rendered the surfaces more p-type, but caused essentially no change in the density of traps. The observed changes of the electrical properties were correlated to the results of desorption experiments in which a mass spectrograph was employed. The total surface charge was found to increase linearly with the amount of desorbed water 0.00025 negative elementary charges per desorbed water molecule. Author
- Physical Chemistry
- Solid State Physics