Buried storage punch through dynamic ram cell

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357 23, 357 20, H01L 2978

Patent

active

042031257

ABSTRACT:
An MOS random access memory cell using the capacitance of a buried P-N junction as the storage element is formed by a process compatable with standard N-channel silicon gate manufacturing methods. The cell is fabricated using a method which consists of an implanted channel stopper underneath a thick field oxide, a buried, fully implanted charge storage element which also is the source of the cell transistor, self-aligned polysilicon gates, multilayer oxide and a thin film of metallization for interconnections. The vertical stacking of the charge storage and transfer elements and the increase in storage area to cell area ratio with the buried storage area provide a cell with very high packing density.

REFERENCES:
patent: 3748187 (1973-07-01), Aubuchon
patent: 4065783 (1977-12-01), Ouyang

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