Resources Contact Us Home
Manufacturing method of well region in coms intergrated circuit

Image Number 9 for United States Patent #5114868.

First, N-type channel stoppers are formed in an element formation region of a P-channel MOS transistor and in an element isolation region of the P-channel MOS transistor, of a CMOS transistor. After forming a field oxide film, an N well is formed in the element formation region of the P-channel MOS transistor. In spite of the fact that the dose of ions used for the formation of an N-type channel stopper is smaller than the dose of ions used for the formation of an N well, the surface concentration of the N-type impurity of the N-type channel stopper is higher than that of the N well. The N-type impurity concentration in the portion where the N-type channel stopper and the N well are brought into contact, becomes uniform. The variability in the threshold voltage of the P-channel MOS transistor, the threshold voltage of the P-channel parasitic MOS transistor, the junction breakdown voltage of the P.sup.+ diffused layer and the junction capacitance of the P.sup.+ diffused layer is reduced, so that the device obtained is suited for the submicron process.

  Recently Added Patents
Internal wiring structure of semiconductor device
Aluminum oxide coated cutting tool and method of manufacturing thereof
Content reproduction apparatus and content processing method therefor
Isolated nucleic acid molecule encoding an antibody that reduces GDF-8 activity
Cycloalkylamine substituted isoquinoline derivatives
(-)-epigallocatechin gallate derivatives for inhibiting proteasome
Fuser member having composite outer layer
  Randomly Featured Patents
Pyrotechnic actuator for retracting a piston
Looper drive mechanism of a sewing machine
Two-port ethernet line extender
Moisture seal for electrical interconnect system
Implantable biosensor system, apparatus and method
Vented woofer frame
Multi-piece applique for vehicle B-pillar
Conforming tuning coupler for flextensional transducers
Stringed instrument neck having finger slots
Casement window fastening system