HIGH-VOLTAGE MOS TRANSISTOR DEVICE AND METHOD OF MAKING THE SAME

摘要

A substrate (1) is provided with a deep body well (2), a counter drift well region (3), a drain well region (4) in the vicinity of the drain region (8), a drift region (5), a channel well region (6) and a source region (7). A gate electrode (9) and a gate dielectric (10) are arranged above an area provided as a channel region between the source region (7) and the drift region (5). The drain well region (4) enables the application of an especially deep body well (2) while providing an extended vertical distance for the voltage drop. A high blocking voltage, a precisely short channel and a well-defined threshold voltage are obtained. The structure of the wells is appropriate for the integration of further high-voltage devices, especially NMOS transistors.