Taiwan Semiconductor Manufacturing Comp. Ltd.

An-Lun Lo

Chrong-Jung Lin

Ya-Chin King

Tzong-Sheng Chang

Wei-Shuo Ho

A method for forming a semiconductor device structure is provided. The method includes forming a first gate stack, a second gate stack, and a third gate stack, which are positioned over a semiconductor substrate and spaced apart from each other. The method includes removing portions of the semiconductor substrate to form a first recess, a second recess, and a third recess in the semiconductor substrate. The method includes forming a first doped structure, a second doped structure, and an isolation structure in the first recess, the second recess, and the third recess respectively. The first gate stack, the second gate stack, the first doped structure, and the second doped structure together form a memory cell. The isolation structure is wider and thinner than the second doped structure. A top surface of the isolation structure has a fourth recess.

Method for forming semiconductor device structure

A semiconductor device structure is provided. The semiconductor device structure includes a semiconductor substrate. The semiconductor device structure includes a first gate stack positioned over the semiconductor substrate. The semiconductor device structure includes a first doped structure and a second doped structure positioned at two opposite sides of the first gate stack and embedded in the semiconductor substrate. The semiconductor device structure includes a second gate stack positioned over the semiconductor substrate and adjacent to the second doped structure. The semiconductor device structure includes a third gate stack positioned over the semiconductor substrate. The semiconductor device structure includes an isolation structure embedded in the semiconductor substrate and between the second gate stack and the third gate stack. The isolation structure is wider and thinner than the second doped structure, and the isolation structure is made of an epitaxial material.

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Taipei, Taiwan

An-Lun Lo