Patent ID: 6100129
Filing Date: 2000-08-08
Classification: H01L

Abstract:
A method for manufacturing a fin-trench capacitor on a substrate including a landing pad connected to a source or drain region, the method comprising:forming a plurality of alternating oxide and nitride layers including a top oxide layer, wherein said nitride layers are sandwiched between said oxide layers;forming a storage node contact opening in said plurality of alternating oxide and nitride layers, said storage node contact stopping at said landing pad;removing a portion of said nitride layers along the sidewalls of said contract opening;forming an in-situ doped polysilicon layer over said top oxide layer, conformally along said sidewalls of said contact opening so that said doped polysilicon layer does not completely fill said contact opening, and contacting said landing pad;depositing a photoresist layer into said contact opening;removing a portion of said in-situ doped polysilicon layer on top of said top oxide layer;removing said photoresist layer;forming a thin dielectric layer over said top oxide layer and conformally on top of said in-situ doped polysilicon layer along said sidewalls of said contact opening;forming a in-situ doped top polysilicon layer over said thin dielectric layer and in said contact opening.