. The Bell System technical journal . a thermal probe. Small cubes of lithium ( cm on a side) were placed on the ends ofboth samples (the lapped end of phosphorus-doped one) and alloyed tothe silicon for 30 seconds at 650°C in an atmosphere of dry helium. Afterthis treatment the various junction contours should have looked likethose in Fig. 6, in which the bottom crystal is shown with the phosphorus-doped skin (cross hatched). During the alloying process a small amountof spherical diffusion of lithium occurs so that small hemisphericaln-regions form with the alloy beads as origins. These
. The Bell System technical journal . a thermal probe. Small cubes of lithium ( cm on a side) were placed on the ends ofboth samples (the lapped end of phosphorus-doped one) and alloyed tothe silicon for 30 seconds at 650°C in an atmosphere of dry helium. Afterthis treatment the various junction contours should have looked likethose in Fig. 6, in which the bottom crystal is shown with the phosphorus-doped skin (cross hatched). During the alloying process a small amountof spherical diffusion of lithium occurs so that small hemisphericaln-regions form with the alloy beads as origins. These are shown in Fig. 6. Next the specimens were heated in vacuum for about six hours at400°C. Diffusion of lithium into the body of the crystal should occurduring this period. However in the sample not protected by the n-typeskin lithium should leak to the oxide sink on the surface so that then-type region due to the lithium should have the pear-shaped contourshown in the upper part of Fig. 7. If the built-in field at the p-n junction.
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