Sharp Kabushiki Kaisha Corporation

Norihiro Tokuyama

Alberto Oscar Adan

Satoshi Hikida

Hiroshi Ishihara

Toshinori Ohmi

Masaru Yuki

After a field oxide film is formed on a P-type semiconductor substrate, ion implantation of boron is carried out with respect to a whole surface of the substrate so that a channel stopper layer is formed. Then, a MOS FET is formed in an active region of the semiconductor substrate. Subsequently, ion implantation of phosphorus is carried out, by using a gate electrode of the MOS FET and the field oxide film as a mask, so that impurity layers which have the same type of conductivity as that of the channel stopper layer and has a concentration lower than that of the channel stopper layer are formed right under the source/drain regions of the MOS FET between the source/drain regions and the channel stopper layer.

Semiconductor device and method of manufacturing same

A method of producing a semiconductor device having a LDD structure using a semiconductor substrate laminated with an insulating film, a polysilicon layer, and a first conductive layer where the first conductive layer is formed of a high melting point metal and the first conductive layer and polysilicon layer are removed in the region other than a gate pattern formation region but without exposing the insulating layer. After implanting the semiconductor substrate with a first impurity, the residual polysilicon layer in the region other than the gate pattern formation region along with a polysilicon layer sidewall in the gate pattern formation region are converted into a silicon oxide layer by subjecting to oxidation treatment, and the semiconductor substrate is laminated with a second conductive layer. Subsequently, the second conductive layer is removed by anisotropic etching so as to remain only on the sidewall of the gate pattern formation region, and the semiconductor substrate is then implanted with a second impurity to form source and drain regions.

Manufacturing method of semiconductor device

A non-volatile programmable memory having:

Growing community of inventors

Tenri, Japan

Norihiro Tokuyama