INTEGRATED CIRCUIT DEVICE WITH DEEP TRENCH ISOLATION REGIONS FOR ALL INTER-WELL AND INTRA-WELL ISOLATION AND WITH A SHARED CONTACT TO A JUNCTION BETWEEN ADJACENT DEVICE DIFFUSION REGIONS AND AN UNDERLYING FLOATING WELL SECTION

摘要

Disclosed are embodiments of an improved integrated circuit device structure (200) (e.g., a static random access memory array structure or other integrated circuit device structure incorporating both P-type and N-type devices) (121a and 121b) and a method of forming the structure that uses DTI regions (160) for all inter- well and intra- well isolation and, thereby provides a low-cost isolation scheme that avoids FET width variations due to STI-DTI misalignment. Furthermore, because the DTI regions (160) used for intra- well isolation effectively create some floating well sections, (203) which must each be connected to a supply voltage (e.g., Vdd) (280) to prevent threshold voltage (Vt) variations, the disclosed integrated circuit device also includes a shared contact (280) to a junction between the diffusion regions (221 and 222) of adjacent devices (121a and 121b) and an underlying floating well section (205). This shared contact (280) eliminates the cost and area penalties that would be incurred if a discrete supply voltage contact was required for each floating well section (205).