PATENT COVER GRAPHIC


United States Patent 4,141,020
February 20, 1979

Intermetallic Aluminum-Transition Metal Compound Schottky Contact
James K. Howard
William D. Rosenberg
James F. White


Filed December 29, 1976
Image of US PATENT 4,141,020

Abstract of the Disclosure

An aluminum-transition metal Schottky barrier contact, and methods of fabricatio n thereof are disclosed. In one preferred embodiment, the junction is comprised of an aluminum-tantalum intermetallic layer abutting a silicon substrate. Alte rnate embodiments utilize an intermetallic compound of a metal selected from the group of tantalum, zirconium, hafnium, niobium, titanium and nickel in combinat ion with aluminum. The preferred embodiments can be fabricated by evaporation o f a layer of a metal selected from the above mentioned group followed by evaporation of a layer of aluminum on a silicon substrate, after which an annealing step is utilized which creates the desired intermetallic compound in a layer abutting the silicon surface. Alternatively, the junction can be created by hot or cold sputtering of a preselected intermetallic compound of one of the metals with aluminum directly upon the silicon substrate, followed by deposition of a conductive layer such as aluminum. In the case of cold sputtering and annealing step is required to perfect the desired intermetallic compound structure; and in the case of hot sputtering an annealing step may be useful in perfecting the desired intermetallic structure, although it is not essential. The resulting devices are highly thermally stable with predictable barrier heights; and exhibit excellent electrical properties while they are capable of fabrication with good planarity
Figure descriptions: cover graphic

  • a schematic three-dimensional view of a Schottky barrier junction designed in accordance with the invention.

 Citations [54]:
  
3,506,893 04/1970 Dhaka 1,426,395 02/1976 United Kingdom 3,652,905 03/1972 Page 3,669,730 06/1972 Lepsecter 3,780,320 12/1973 Dorler et al 3,995,301 11/1976 Magdo 4,009,481 02/1977 Reinol 4,017,890 04/1977 Howard et al
National Museum of American History
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