Accession Number:

AD0416815

Title:

SIMULTANEOUS CONTAMINATION DD CONVERSION EFFECTS IN GERMANIUM HEATED TO TEMPERATURES IN THE EVAPORATION RANGE,

Descriptive Note:

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

Report Date:

1963-07-26

Pagination or Media Count:

8.0

Abstract:

Studies of germanium source material used for the vacuum evaporation of this germanium films have been carried out by measuring the changes in the electrical properties of sources heated in the temperature range from 1100 to 1600 C. Using standard evaporation techniques and standard boat materials, the source germanium converts strongly to p-type, regardless of ini tial conductivity or type, and the properties of the resulting films are insensitive to the properties of the source. In a study of the causes of this source conversion, a number of experiments were performed which involved sielle evaporation and combined zone-refining and evaporation processes in quartz and graphite boats in vacuum and helium ambients. The results indicate that the prevention of source con version in vacuum may be attained by utilization of the zone-refining process in graphite, in situ, prior to treatment of the germanium as an evaporant. In addition, the results found using this technique confirm the hypothesis of Allen, Buck, and Law on the effect of Ge contam ination by boron in borosilicate glass vacuum systems. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE