| 摘要 |
A method of forming a capacitor includes, a) providing a series of alternating first and second layers of semiconductive material over a node location, a first of the first and second layers having an average conductivity enhancing dopant concentration of greater than about 5x1019 ions/cm3, a second of the first and second layers having an average conductivity enhancing dopant concentration from 0 ions/cm3 to about 5x1019 ions/cm3, at least one of the first and second layers being selectively etchable relative to the other of the first and second layers; b) providing a contact opening through the first and second layers of semiconductive material to the node location; c) providing an electrically conductive within the contact opening; d) masking and etching the conductive layer and the series of alternating layers to form a first capacitor plate; e) etching the one of the first and second layers at a faster rate than the other of the first and second layers to define lateral projections of the other of the first and second layers relative to the one of the first and second layers, the electrically conductive layer being in ohmic electrical connection with the first and second layers and lateral projections thereof; the conductive layer, the first and second layers and lateral projections thereof comprising the first capacitor plate; f) providing a capacitor dielectric layer over the conductive layer and the lateral projections; and g) providing a second capacitor plate over the capacitor dielectric layer.
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