TRENCH DMOS TRANSISTOR AND METHOD THEREOF USING SIDEWALL SPACERS

摘要

PURPOSE: A trench DMOS transistor and method thereof with deep body regions that occupy minimal area on an epitaxial layer formed on a semiconductor substrate which can prevent a lateral diffusion of the deep body diffusion are disclosed. CONSTITUTION: A first oxide layer (110) is formed over the epitaxial layer (104) and patterned to define deep body areas (102b) beneath which a deep body regions (138b) are to be formed. Next, diffusion inhibiting regions (105) of the first conductivity type are formed in each of the deep body areas (102b) before forming a second oxide layer (112) covering the deep body areas (102b) and the remaining portion of the first oxide layer (110). Portions of the second oxide layer (112) are then removed to expose the centers of diffusion inhibiting regions (105), leaving the first oxide layer (110) and oxide sidewall spacers (103) from the second oxide layer to cover the peripheries of the diffusion inhibiting regions (105). A deep body diffusion of a second conductivity type is then performed, resulting in the formation of deep body regions (138b) in the epitaxial layer (104) between the sidewall spacers (103). The peripheries of the diffusion inhibiting regions (105) covered by the remaining portions of the first and second oxide layers (110/112) inhibit lateral diffusion of the deep body diffusions (138b) without significantly inhibiting diffusion depth.