| 简介 |
A p-well (12) is formed on a surface of an Si substrate (11) and element isolation insulating films (13) are formed. Next, a thin SiO2 film (14a) is formed on the whole surface, and an oxide film containing a rare earth metal (for example, lanthanum (La) or yttrium (Y)) and aluminum (Al) is formed thereon as an insulating film (14b). Furthermore, a polysilicon film (15) is formed on the insulating film (14b). After that, the SiO2 film (14a) and the insulating film (14b) are allowed to react with each other by performing a heat treatment, for example, at approximately 1000° C. to form a silicate film containing the rare earth metal and Al. In a word, the SiO2 film (14a) and the insulating film (14b) are allowed to be a single silicate film. |
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