Resources Contact Us Home
Method for forming twin well

Image Number 8 for United States Patent #5661067.

An improved twin well formation method for a semiconductor device capable of improving the latch-up characteristic in DRAM device which requires a high integration density and of improving a recess problem which occurs due to the capacitor, which includes the steps of a first step which forms an insulation film on a semiconductor substrate having a first region and a second region; a second step which forms a first temporary film on an insulation film of the first region; a third step which forms a first side wall spacer at the first temporary side wall; a fourth step which implants a first conductive ion to a substrate of a second region; a fifth step which forms a second temporary film on a substrate of the second region; a sixth step which removes the first temporary film; a seventh step which implants a second conductive ion to a substrate of the first region; and an eighth step which anneals and removes the second temporary film and the first insulation spacer.

  Recently Added Patents
Adaptive switch mode LED system
Methods and systems for managing electronic messages
Content protection apparatus and content encryption and decryption apparatus using white-box encryption table
System and method for detecting executable machine instructions in a data stream
Multiple RF band operation in mobile devices
Group of amino substituted benzoyl derivatives and their preparation and their use
  Randomly Featured Patents
Microfilm reader
Machine for filling containers provided with automatic devices for rapidly locking/releasing the interchangeable elements guiding and moving the containers themselves
Heat exchange apparatus with parallel flow
Catalyst for .alpha.E --olefin polymerization containing a Lewis base
Dye image reversal processes and image transfer film units
Methods of forming ruthenium film by changing process conditions during chemical vapor deposition and ruthenium films formed thereby
Optically active hydroxybenzylamine
Printing system, printing apparatus, information processor, printing program, and printing method
Water sports equipment
Banklight system for producing variable gradation lighting effects