DEVELOPMENT OF TECHNIQUES FOR PREPARING HOMOGENEOUS SINGLE CRYSTALS OF LEAD TELLURIDE, LEAD SELENIDE, AND LEAD SULFIDE
Quarterly progress rept. no 19, 15 Jan-15 Apr 1966
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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Experimental work on the doping of PbTe was concluded and the major thrust of work was shifted to the preparation of PbTe-SnTe alloy crystals. The results of studies on platinum-doped PbTe indicate that platinum is a donor in PbTe which apparently reacts with lead vacancies to give material with low free- carrier concentrations. Carrier mobilities are high, indicating that the densities of scattering centers in the resulting material are low. Initial experimentation on the growth of PbTe crystals from solution in Pb yielded only small crystals. However, the compound phase appeared to be continuous and development of the method for ultimate use for the growth of large alloy crystals is planned. Experimental work on the preparation of SnTe and PbTe-SnTe alloy crystals has included growth from the melt, the heat treatment of melt- grown crystals, and the vapor growth of crystals. The first two procedures have, to date, yielded only high-carrier-concentration, p-type material. Small, high-mobility n-type crystals of alloy, containing about 20 mole percent SnTe, were prepared by vapor growth, however.
- Solid State Physics