Patent ID: 6376294
Filing Date: 2002-04-23
Classification: H01L

Abstract:
A method for fabricating a dog-bone in a DRAM device, comprising the steps of:providing a semiconductor structure having an upper silicon layer with STIs formed therein; the semiconductor structure having a LOGIC region and a DRAM region with a stitch region overlapping each of the LOGIC and DRAM region therebetween; forming a polysilicon layer over the semiconductor structure within the LOGIC region, DRAM region, and stitch region; selectively implanting a dopant in the polysilicon layer within the DRAM region and a portion of the stitch region within the DRAM region to form a doped poly segment and an undoped poly segment within the LOGIC region and a portion of the stitch region within the LOGIC region; forming a hard mask over the doped poly segment and the undoped poly segment; patterning the hard mask to form at least one patterned first mask layer portion only over the doped poly segment within the DRAM region; forming at least one second mask layer portion over the undoped poly segment within the LOGIC region and at least one third mask layer portion over the doped poly segment in the portion of the stitch region within the DRAM region; etching the doped poly segment and undoped poly segment not under the first mask layer portion and or the second and third mask layer portions to form: undoped poly periphery logic gate portions within the LOGIC region; doped poly dog-bone within the portion of the stitch region within the DRAM region; and doped poly word lines within the DRAM region; and stripping the second and third mask layer portions to expose the undoped poly periphery logic gate portions and the doped poly dog-bone.