Method of manufacturing semiconductor device and semiconductor device

A semiconductor device, comprising:

• a plurality of trench data storage capacitors formed in a memory cell-forming region of a semiconductor substrate;
• a first isolation part for isolating the plurality of trench data storage capacitors from each other;
• a lateral field effect transistor for forming a peripheral circuit, formed in a peripheral circuit-forming region of the semiconductor substrate;
• a second isolation part for isolating devices from each other, formed in the peripheral circuit-forming region;
• and
• a vertical field effect transistor for memory cell selection, having semiconductor layers for a source and drain, one of which is electrically connected to one of the electrodes of a respective data storage capacitor of the plurality of trench data storage capacitors,
• wherein the first isolation pail is thinner than the second isolation part.

A semiconductor device, comprising:

• a plurality of trench data storage capacitors formed in a memory cell-forming region of a semiconductor substrate;
• a lateral field effect transistor for forming a peripheral circuit, formed in a peripheral circuit-forming region of the semiconductor substrate;
• and
• a vertical field effect transistor for memory cell selection, having semiconductor layers for a source and drain, one of which is electrically connected to one of the electrodes of a respective data storage capacitor of the plurality of trench data storage capacitors,
• wherein the vertical field effect transistor Is provided so as to extend in a direction orthogonal to the main surface of the semiconductor substrate, and has a columnar body which forms a channel portion,
• the columnar body has a first surface crossing to the main surface of the semiconductor substrate, a second surface crossing to the main surface of the semiconductor substrate and facing to the first surface, third and fourth surfaces crossing to the main surface of the semiconductor substrate and also crossing to the third and fourth surfaces, and a fifth surface parallel to the main surface of the semiconductor substrate and crossing to the first to fourth surfaces, and
• a gate insulating film of the vertical field effect transistor is provided on the first and second surfaces, and the length of the sides of the fifth surface in contact with the first and second surfaces is longer than that of the sides in contact with the third and fourth surfaces.

A semiconductor device, comprising:

• (a) a plurality of trench data storage capacitors formed in a memory cell-forming region of a semiconductor substrate;
• (b) a lateral field effect transistor for forming a peripheral circuit, formed in a peripheral circuit-forming region of the semiconductor substrate;
• (c) a first insulating film formed so as to cover the lateral field effect transistor in the peripheral circuit-forming region and expose a part of the data storage capacitor in the memory cell-forming region;
• and
• (d) a second insulating film provided on a side surface of the first insulating film at the boundary between the peripheral circuit-forming region and the memory cell-forming region so as to smooth a step part between the peripheral circuit-forming region and the memory cell-forming region.

A semiconductor device, comprising:

• (a) a plurality of trench capacitors functioning as data storage capacitors and formed in a memory cell-forming region of a semiconductor substrate;
• (b) a vertical field effect transistor for memory cell selection, having semiconductor layers for a source and drain, one of which is electrically connected to a first electrode of a respective trench capacitor of said plurality of trench capacitors;
• (c) a dummy trench capacitor formed in the memory cell-forming region of the semiconductor substrate, not electrically connected to the vertical field effect transistor for memory cell selection, and not functioning as a data storage capacitor;
• and
• (d) a power supply part which is provided in the region where the dummy trench capacitor is arranged, and which supplies a first voltage to a second electrode of the plurality of trench capacitors functioning as data storage capacitors.