Abstract
The open boat evaporation of low arsenic−selenium alloys has been investigated to determine the feasibility of depositing compositionally uniform films. Although a thermochemical analysis is presented which indicates that congruent evaporation should occur in this system, experimentally determined arsenic profiles reveal that unfractionated films cannot be obtained by this technique. In situ measured evaporation rates using a quartz crystal oscillator demonstrate that this is a consequence of the low−thermal transfer from the boat to the alloy, relative to the high evaporation rate of the melt, causing the required congruent evaporation temperature to be unattainable.
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