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    • 4. 发明授权
    • Semiconductor memory device having improved isolation between
electrodes, and process for fabricating the same
    • 具有改善的电极隔离的半导体存储器件及其制造方法
    • US5499207A
    • 1996-03-12
    • US281568
    • 1994-07-28
    • Hiroshi MikiYuzuru OhjiShinichi Tachi
    • Hiroshi MikiYuzuru OhjiShinichi Tachi
    • H01L21/02H01L27/108G11C11/24
    • H01L28/55H01L27/10817H01L28/60Y10S438/974
    • With recent decreases in the size of semiconductor memories, isolation problems typically arise during fabrication of a capacitor for a high-capacity semiconductor memory device. To overcome this, arrangements are provided to improve the isolation between capacitor elements even if those elements are extremely close together. For example, if a material such as platinum is used as a capacitor bottom electrode, a thin layer of titanium oxide can be deposited before forming the platinum, to provide a structure in which the titanium oxide is on the bottom portion of the trench. A high-dielectric-constant insulator is then formed over that structure by the Chemical Vapor Deposition. The high-dielectric-constant insulator has a composition which satisfies the stoichiometric composition over the platinum and which has more titanium atoms than those of the stoichiometric composition on the trench bottom. The resulting non-stoichiometric composition layer formed on the trench bottom has a low dielectric constant and a high insulation to maintain electric insulation between adjoining bottom capacitor electrodes. Because of a low crystallization, moreover, a layer having a planarized morphology is formed.
    • 随着半导体存储器的尺寸近来的减小,在大容量半导体存储器件的电容器制造过程中通常会出现隔离问题。 为了克服这一点,即使这些元件非常靠近在一起,也提供了用于改善电容器元件之间的隔离的布置。 例如,如果使用诸如铂的材料作为电容器底部电极,则可以在形成铂之前沉积氧化钛薄层,以提供氧化钛在沟槽的底部上的结构。 然后通过化学气相沉积在该结构上形成高介电常数绝缘体。 高介电常数绝缘体具有满足铂的化学计量组成并且具有比沟槽底部的化学计量组成更多的钛原子的组成。 形成在沟槽底部上的非化学计量组合物层具有低介电常数和高绝缘性,以保持邻接的底部电容器电极之间的电绝缘。 此外,由于低结晶,形成具有平坦化形态的层。