Method of manufacturing 3D NAND through microwave annealing
A technology of microwave annealing and microwave cavity, which is applied in semiconductor/solid-state device manufacturing, electrical components, electric solid-state devices, etc., can solve the problems of unsatisfactory memory performance and achieve the effect of improving performance and crystallization quality
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[0026] The inventors conducted research on the above problems and found that the performance of 3D NAND devices depends on the quality of polysilicon crystallization, and the microwave method is used to anneal amorphous silicon to convert amorphous silicon into polysilicon, which can improve the crystallization quality of polysilicon. The performance of the 3D NAND device is thereby improved.
[0027] After further research, the inventor proposed a method for preparing 3D NAND by microwave annealing, which includes: forming a multi-layer stacked structure on a semiconductor substrate, the stacked structure sequentially includes a first material layer and a second material layer; Forming a through hole in the stacked structure to expose the semiconductor substrate; forming amorphous silicon on the sidewall of the through hole; performing microwave annealing on the amorphous silicon to convert the amorphous silicon into polysilicon. Thus, the crystallization quality of the polys...
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