Patent ID: 6087223
Filing Date: 2000-07-11
Classification: H01L,Y10S

Abstract:
A fabrication method of a semiconductor flash memory device, comprising the steps of:forming a plurality of patterned first insulation films on a substrate so as to be distanced from each other to a certain extent;forming a gate insulation film on the substrate and between the patterned first insulation films;depositing a first poly-silicon layer on the gate insulation film and the patterned first insulation film;forming a floating gate by etching the first poly-silicon layer so as to expose certain parts of each of the gate insulation film and the patterned first insulation film;forming a second insulation film on each of the floating gate and the substrate having buried bit lines therein, the buried bit lines each having first and second regions, with the first region having a depth greater than the second region; andforming a control gate on the second insulation film.