| 摘要 |
A method for forming a trench capacitor and memory cell by providing a substrate on which a grid STI and a plurality of active regions covered by a hard mask layer are formed. A photoresist is formed and a low grade photo mask having only X direction consideration is used to define the required pattern on the photoresist. The hard mask layer and the STI are used as an etching mask to etch a plurality of deep trenches. Then diffusion regions, capacitor dielectric layer, and polysilicon filled to form the capacitor bottom electrode are sequentially formed to complete the forming for trench capacitors. After removing the hard mask layer and performing a logic process, the memory cells are completed.
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