Patent ID: 11916060
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. A method for forming a semiconductor device, the method comprising:
forming a doped well region in a semiconductor substrate by doping the semiconductor substrate with first doping type dopants;
forming a gate stack over the semiconductor substrate and overlying the doped well region;
forming a source region in the doped well region and on a first side of the gate stack;
forming a drain region in the doped well region and on a second side of the gate stack opposite the first side, wherein forming the drain region comprises:
forming a patterned masking layer over the semiconductor substrate, wherein the patterned masking layer comprises a plurality of openings disposed on the second side of the gate stack, wherein the plurality of openings comprises a first opening and a second opening, wherein the first opening exposes a first portion of the doped well region, wherein the second opening exposes a second portion of the doped well region, and wherein a portion of the patterned masking layer covers a third portion of the doped well region that extends laterally between the first portion of the doped well region and the second portion of the doped well region; and
doping the semiconductor substrate through the plurality of openings with second doping type dopants, thereby respectively forming a plurality of doped segments in the doped well region, wherein a doping type of the second doping type dopants is opposite a doping type of the first doping type dopants.