Patent ID: 6833303
Filing Date: 2004-12-21
Classification: H01L

Abstract:
A method for forming a semiconductor device, comprising the steps of:depositing a pad oxide film and a nitride film on a silicon substrate, forming a 77Â° angle trench by photo etching and dry etching, depositing a HLD oxide film and then performing device insulation; performing a cell Vt implant process on the resulting material and then forming a first photoresist pattern for adjusting a capacitor Vt; defining a capacitor region by performing dry etching using the HLD oxide film and the first photoresist pattern as a barrier layer; performing an implant process on the resulting material; forming a gate oxide film on the resulting material, depositing a doped poly and forming a second photoresist pattern; forming a trench capacitor and a gate by photo etching and dry etching using the second photoresist pattern; and depositing an interlayer film on the resulting material, planarizing the same, forming a metal contact and performing a bit line and wiring process thereon.