Mos transistor having self-aligned well bias area and method of fabricating the same

摘要

A MOS transistor having a self-aligned well bias area and a method of fabricating the same provide for efficient application of well bias in a highly integrated semiconductor substrate without causing latch-up. The well bias area is formed at a trench, which is formed by etching a semiconductor substrate in a manner of self-alignment, so that well bias can be efficiently applied to the MOS transistor achieving reduction of the area of a chip without degradation of electrical characteristics.