| 摘要 |
<p>In a method for burying a contact hole according to the present invention, first, a polycrystalline silicon film (106) is formed on a region including a contact hole (105). Impurities are introduced into the polycrystalline silicon film (106). Next, a metal film is formed on the polycrystalline silicon film (106). Next, a polycrystalline silicon film (108) is formed on the metal film. Impurities are introduced into the polycrystalline silicon film (108). Next, a metal film is formed on the polycrystalline silicon film (108). A polycrystalline silicon film (110) is formed on the metal film, and the contact hole is completely buried. Thereafter, a heat treatment is performed, thereby the impurities are diffused to the above two polycrystalline silicon films and all or a part of the metal film is changed to a metal silicide film (111, 112). Next, an etchback is performed, thereby the polycrystalline silicon film and the metal silicide film are kept in only the contact hole. <IMAGE></p> |
