PATENT COVER GRAPHIC


United States Patent 3,495,140
February 10, 1970

Light-Emitting Diodes And Method Of Making Same
Roy H. Cornely
Walter F. Kosonocky


Filed October 12, 1967
Image of US PATENT 3,495,140

Abstract of the Disclosure

A light-emitting diode comprises a PN junction whose effective width is defined by the thickness of a portion of semiconductor material of one type conductivity epitaxially grown in the cleavage crack of a cleaved wafer of semiconductor material of relatively high resistivity. Layers of semiconductor material of mutually opposite major surfaces, respectively, of the cleaved wafer, one of the layers being integral with, and substantially similar to the aforementioned portion.
 The improved method of making the diode comprises:
 (a) cleaving a wafer of semiconductor material,
 (b) maintaining the parts of the cleaved wafer closely spaced from each other, and
 (c) depositing a pair of layers of highly doped semiconductor material of opposite type conductivities adjacent opposite major surfaces, respectively, of the cleaved wafer, a portion of semiconductor material similar to one of the layers being integral therewith and extending into the space between the parts of the cleaved wafer and forming a PN junction with the other layer.
Each of the parts of the cleaved wafer may comprise a plurality of layers of semiconductor material of opposite type conductivies and also have at least one PN junction that is back-biased by means causing current to flow through the diode in a forward direction.
Figure descriptions: cover graphic

  • Figure 1 is an enlarged perspective view of an improved light-emitting diode made by the improved method, showing the diode connected in a schematic circuit for operation.
  • Figures 2 and 3 are fragmentary perspective views of wafers used in the improved method of making the diode.
  • Figure 4 is a longitudinal cross-sectional view of apparatus used in the improved method of making the diode.

 Citations [54]:
  
3,312,881 04/1967 Yu 3,247,576 04/1966 Dill 3,410,735 11/1968 Hackley 3,327,182 06/1967 Kisinko
National Museum of American History
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