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Semiconductor integrated circuit device and process for producing the same

  • US 4,900,695 A
  • Filed: 12/17/1987
  • Issued: 02/13/1990
  • Est. Priority Date: 12/17/1986
  • Status: Expired due to Term
First Claim
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1. A process for producing a semiconductor integrated circuit device having a multilayer wiring structure in which a first insulating film is interposed between an upper-level wiring and a lower-level wiring and the surface of said upper-level wiring is protected by a second insulating film, said method comprising the steps of:

  • preparing a semiconductor substrate having an integrated circuit formed thereon, said integrated circuit including a semiconductor element having a PN junction, said substrate further having a multilayer wiring structure formed on its surface, said wiring structure being electrically connected to said integrated circuit;

    selectively removing successively the second insulating film, the upper-level wiring under said insulating film and the first insulating film under said upper-level wiring in said multilayer wiring structure by machining with a focused ion beam to form a contact hole through which a surface of said lower-level wiring is exposed, said contact hole exposing a surface of the upper-level wiring;

    changing a region of said upper-level wiring whose surface is exposed through said contact hole into an insulator; and

    forming a connecting wiring by an optically pumped CVD method so as to extend over from the inside of said contact hole to a selective region on the surface of said second insulating film, said connecting wiring being electrically connected to said lower-level wiring the surface of which is exposed through said contact hole.

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