Pick-up structure for DRAM capacitors
First Claim
1. A capacitor pick-up structure, applied to a memory cell array area of a DRAM that is disposed on a substrate over a doped band in the substrate, and comprising:
- a dummy capacitor in a first trench in the substrate, wherein a bottom of the first trench exposes a portion of the doped band, the dummy capacitor comprising;
a first bottom electrode on an internal surface of the first trench, electrically connecting with the doped band;
a first dielectric layer between the first bottom electrode and a sidewall of the first trench; and
a first top electrode on the first bottom electrode, filling up the first trench; and
a contact over the substrate, electrically connecting with the doped band via the dummy capacitor.
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Accused Products
Abstract
A pick-up structure for DRAM capacitors and a DRAM process are described. A substrate with trenches therein is provided, wherein the trenches include a first trench and the sidewall of each of the trenches is formed with a dielectric layer thereon. A conductive layer is formed on the surfaces of the substrate and the trenches, and then a patterned photoresist layer is formed on the conductive layer filling in the trenches and further covering the first trench. The exposed conductive layer is removed to form bottom electrodes in the trenches, and then the patterned photoresist layer is removed. A capacitor dielectric layer is formed on each bottom electrode, and then top electrodes are formed on the substrate filling up the trenches. A contact is then formed on the bottom electrode in the first trench, electrically connecting the substrate via the bottom electrode.
23 Citations
15 Claims
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1. A capacitor pick-up structure, applied to a memory cell array area of a DRAM that is disposed on a substrate over a doped band in the substrate, and comprising:
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a dummy capacitor in a first trench in the substrate, wherein a bottom of the first trench exposes a portion of the doped band, the dummy capacitor comprising; a first bottom electrode on an internal surface of the first trench, electrically connecting with the doped band; a first dielectric layer between the first bottom electrode and a sidewall of the first trench; and a first top electrode on the first bottom electrode, filling up the first trench; and a contact over the substrate, electrically connecting with the doped band via the dummy capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification