Horizontal Melt Solidification Patents (Class 148/DIG74)
  • Patent number: 5066610
    Abstract: Wetting of encapsulated silicon-on-insulator (SOI) films during a zone-melting recrystallization (ZMR) process is enhanced by a high temperature anneal of the SOI structure in a reactive nitrogen-containing ambient to introduce nitrogen atoms to the polysilicon/silicon dioxide cap interface. The technique is not only more effective in present in cap fracture and enhancing crystal quality but is also susceptible to batch processing with noncritical parameters in a highly efficient, uniform manner. Preferably, the cap is exposed to 100% ammonia at 1100.degree. C. for one to three hours followed by a pure oxygen purge for twenty minutes. The ammonia atmosphere is reintroduced at the same temperature for another one to three hour period before ZMR. The process is believed to result in less than a half monolayer of nitrogen at the interior cap interface thereby significantly lowering the contact angle and improving the wetting character of the SOI structure.
    Type: Grant
    Filed: September 22, 1989
    Date of Patent: November 19, 1991
    Assignee: Massachusetts Institute of Technology
    Inventors: Chenson K. Chen, Bor-Yeu Tsaur
  • Patent number: 4764485
    Abstract: A method for producing a hole in a polymer film includes the steps of depositing a conductive layer onto the polymer film and irradiating a spot on the layer with a burst of focused laser energy at a level sufficient to form an opening in the film and, subsequently, plasma etching the film so as to form a hole of desired depth in the polymer film underlying the opening in the conductive layer. This method is particularly applicable to the formation of multichip intergrated circuit packages in which a plurality of chips formed in a semiconductor wafer are coated with a polymer film covering the chips and the substrates. The holes are provided for the purpose of interconnecting selected chip contact pads via a deposited conductive layer which overlies the film and fills the holes.
    Type: Grant
    Filed: January 5, 1987
    Date of Patent: August 16, 1988
    Assignee: General Electric Company
    Inventors: James A. Loughran, James G. McMullen, Alexander J. Yerman
  • Patent number: 4604159
    Abstract: Disclosed is a method of forming a large number of monocrystalline silicon regions, of uniform orientation, on the surface of an insulator material. Initially, a large number of island regions of amorphous or polycrystalline silicon, thermally connected to one another in a predetermined direction by connecting regions, are provided. Then such island regions are sequentially melted and regrown in such predetermined direction so as to form the monocrystalline semiconductor regions, with such regions having a uniform orientation. Thereafter, such connecting regions can be removed in order to isolate the island regions. The connecting regions can be formed with gaps, whereby such connecting regions need not be removed. The connecting regions can be formed of materials having a higher heat conductivity than that of the material of the island regions, and/or the connecting regions can have a smaller cross-sectional area at right angles to the predetermined direction than that of the island regions.
    Type: Grant
    Filed: June 13, 1984
    Date of Patent: August 5, 1986
    Assignee: Hitachi, Ltd.
    Inventors: Yutaka Kobayashi, Akira Fukami, Takaya Suzuki