摘要:
A silicon-on-insulator semiconductor device (40) having laterally-graded channel regions (23A, 24A) and a method of making the silicon-on-insulator semiconductor device (40). The silicon-on-insulator semiconductor device (40) has a gate structure (16) having sidewalls (19, 21) on a semiconductor layer (12). Lightly doped regions (26A, 27A) extend through an entire thickness of a portion of the semiconductor layer (12) under the sidewalls (19, 21). A laterally-graded channel region (23A) is formed below the gate structure (16) and abutting one (26A) of the lightly doped regions. A source (33) is formed in a first (26A) of the lightly doped regions and a drain region (34) is formed in a second (27A) of the lightly doped regions.
摘要:
A method for forming an isolation structure (22) on a SOI substrate (11) is provided. A three layer stack of an etchant barrier layer (16), a stress relief layer (17), and an oxide mask layer (18) is formed on the SOI substrate (11). The three layer stack is patterned and etched to expose portions of the etchant barrier layer (16). The silicon layer (13) below the exposed portions of the etchant barrier layer (16) is oxidized to form the isolation structure (22). The isolation structure (22) comprises a bird's head region (21) with a small encroachment which results in higher edge threshold voltage. The method requires minimum over-oxidation and provides for an isolation structure (22) that leaves the SOI substrate (11) planar. Minimal over-oxidation reduces the number of dislocations formed during the oxidation process and improves the source to drain leakage of the device.