United States Patent 3,467,557
September 16, 1969

Polycrystalline Semiconductor Devices
Henley Frank Sterling

Filed December 22, 1966
Image of US PATENT 3,467,557

Abstract of the Disclosure

A process for manufacturing a polycrystalline semiconductor junction device involving epitaxial deposition of semiconductor material of one conductivity type upon a substrate of polycrystalline semiconductor material of opposite conductivity type, said substrate being manufactured by means of the silver boat process. The silver boat process involves melting and subsequent resolidification of semiconductor material wherein the material is heated by radio frequency induction, the material being contained by a vessel of good thermal and electrical conductivity such that radio frequency currents (eddy currents) induced in the vessel interact with the currents induced in the molten material to "levitate" the molten material away from the adjacent surfaces of the vessel.
Figure descriptions: cover graphic

  • Figure 1 is a side view of an apparatus for processing semiconductor material.
  • Figure 2 is a cross sectional view on the line 1-1 of Figure 1.
  • Figure 3 is a plan view of another apparatus for processing semiconductive material, with part shown in section.
  • Figure 4 is a cross-sectional view of the line A-A of Figure 3.

 Citations [54]:
3,013,192 12/1961 Starr
National Museum of American History
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