Method of forming semiconductor structure having contact plug
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United States of America Patent
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Dec 30, 2014
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N/A
app pub date -
Jan 14, 2013
filing date -
Jan 14, 2013
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Abstract
A method of forming a semiconductor structure having at least a contact plug includes the following steps. At first, at least a transistor and an inter-layer dielectric (ILD) layer are formed on a substrate, and the transistor includes a gate structure and two source/drain regions. Subsequently, a cap layer is formed on the ILD layer and on the transistor, and a plurality of openings that penetrate through the cap layer and the ILD layer until reaching the source/drain regions are formed. Afterward, a conductive layer is formed to cover the cap layer and fill the openings, and a part of the conductive layer is further removed for forming a plurality of first contact plugs, wherein a top surface of a remaining conductive layer and a top surface of a remaining cap layer are coplanar, and the remaining cap layer totally covers a top surface of the gate structure.
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