A simple and manufacturing worthy method to pattern a very thin channel body of the FinFET/Tri-gate MOSFET is presented. A channel body as thin as 40 rim using the phase-shift mask (PSM) technique with deep UV 248 rim lithography on LN 210 Shipley resist has been achieved, while having an inherently wider Source/Drain (S/D) extension region. The width of extension region was optimized using the Prolitho.3D lithography simulator for the exposure dose and reticle bias conditions. The device simulation of the wider S/D extension region performed using three-dimensional (3-D) Davinci device simulator shows the significant reduction in the S/D parasitic resistance. Furthermore, these patterns on photoresists like UV 210 provides the basis for the easy integration to the mainstream CMOS technology, hence the potential for manufacturability with higher device performance. (C) 2004 Elsevier B.V. All rights reserved.