| 摘要 |
A buried word line includes a substrate having thereon a recessed trench, an insulating layer on a bottom surface and a sidewall of the recessed trench, and a lining layer in the recessed trench. The lining layer has a cleaned surface that is cleaned by a cleaning solution comprising HF or H3PO4. A tungsten layer is selectively deposited on the cleaned surface of the lining layer.
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