| 摘要 |
Provided is a method of forming a trench in a semiconductor device capable of improving gap-fill performance. In one method of forming a trench in a semiconductor device, an oxide layer and a mask layer are sequentially formed on a substrate. The mask layer is selectively patterned to form a mask layer pattern. The oxide layer and the substrate are patterned using the mask layer pattern as a mask to form an oxide layer pattern and a trench having a predetermined depth from a surface of the substrate. A liner oxide layer is formed in the trench. A wet etching process is performed on the substrate to remove the liner oxide layer from the trench. A device isolation layer is formed in the trench from which the liner oxide layer has been removed. Then, the mask layer pattern and the oxide layer pattern are removed from the substrate.
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