. The Bell System technical journal . ng their long axes and the stain applied to the newly exposed sur-faces. The result has been photographed and is shown in Fig. 8 wherethe crystal on the right has the n-skin. The p-regions show up dark andthe n, light. The result agrees wdth Fig. 7. In another experiment a crystal completely enclosed in a phosphorusskin was immersed in the tin bath described in Section III. It was dis-covered that lithium entered the crystal with no evident difficulty, justas though the skin were absent, but once in, could not be driven out byremoval of the external source
. The Bell System technical journal . ng their long axes and the stain applied to the newly exposed sur-faces. The result has been photographed and is shown in Fig. 8 wherethe crystal on the right has the n-skin. The p-regions show up dark andthe n, light. The result agrees wdth Fig. 7. In another experiment a crystal completely enclosed in a phosphorusskin was immersed in the tin bath described in Section III. It was dis-covered that lithium entered the crystal with no evident difficulty, justas though the skin were absent, but once in, could not be driven out byremoval of the external source and continued heating. The implication isclear. The built-in field has a rectifying action permitting the lithium toenter the crystal but not to leave. In this sense it performs the same func-tion for the mobile lithium ions as it does for holes in a p-n junctiondiode. V. COMPLEX ION FORMATION In the previous text processes involving the interaction of electronsand holes have been considered. In this section attention will be drawn,.
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