Renesas Electronics Corporation

Renesas Technology Corp.

Izumi Takesue

Yoshihiro Ikeda

Tatsuya Fukumura

Shunichi Narumi

A method of manufacturing a semiconductor device having a non-volatile memory cell includes forming first insulating films with first conductive films arranged therebetween, recessing the first insulating films using the first conductive films as a mask, so that heights of top surfaces of the first insulating films are lower than heights of top surfaces of the first conductive films, forming a second insulating film over the first conductive and insulating films, forming a second conductive film over the second insulating film, and patterning the first and second conductive films, and the second insulating film. A length of the floating gate in a second direction is larger than a maximum length of the floating gate in a first direction, and a length from a top surface of the second insulating film to a top surface of the floating gate is larger than a length of a space between a plurality the floating gates.

Semiconductor device and a method of manufacturing the same

A semiconductor device having a nonvolatile memory is reduced in size. In an AND type flash memory having a plurality of nonvolatile memory cells having a plurality of first electrodes, a plurality of word lines crossing therewith, and a plurality of floating gate electrodes disposed at positions which respectively lie between the plurality of adjacent first electrodes and overlap the plurality of word lines, as seen in plan view, the plurality of floating gate electrodes are formed in a convex shape, as seen in cross section, so as to be higher than the first electrodes. As a result, even when nonvolatile memory cells are reduced in size, it is possible to process the floating gate electrodes with ease. In addition, it is possible to improve the coupling ratio between floating gate electrodes and control gate electrodes of the word lines without increasing the area occupied by the nonvolatile memory cells.

Semiconductor device with flash memory cells having improved arrangement for floating gate electrodes and control gate electrodes of the flash memory cells

Growing community of inventors

Sagamihara, Japan

Izumi Takesue