| 摘要 |
A capacitive structure on an integrated circuit and a method of making the same are disclosed, which is particularly useful in random-access memory devices. Generally, the method of the present invention comprises the steps of forming a substantially vertical temporary support 54 (preferably by forming a cylindrical aperture in an insulating layer) on a semiconductor substrate 10 and forming a substantially vertical dielectric film 32 (preferably a high dielectric constant perovskite-phase dielectric film, and more preferably barium strontium titanate) on temporary support 54. The method further comprises depositing a first conductive (e.g. platinum) electrode 60 on substantially vertical dielectric film 32, and subsequently replacing temporary support 54 with a second conductive (e.g. platinum) electrode 64, such that a thin film capacitor 44 which is substantially vertical with respect to substrate 10 is formed. The entire capacitor is essentially self-aligned, such that some embodiments require only one lithography step to complete the capacitor. Also, an advantage of this method is that a high temperature, high oxygen activity dielectric deposition may be completed prior to formation of either electrode, thus greatly simplifying both electrode structure and processing.
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