Signetics

Saiyed A Raza

Sheldon C Lim

George W Conner

Douglas F Ridley

In fabricating a PROM cell, an electrical isolation mechanism (44 and 32) is formed in a semiconductive body to separate islands of an upper zone (36) of first type conductivity (N) in the body. A semiconductor impurity is introduced into one of the islands to produce a region (48) of opposite type conductivity (P) that forms a PN junction laterally bounded by the island's side boundaries. A highly resistive amorphous semiconductive layer (58) which is irreversibly switchable to a low resistive state is deposited above the region in such a manner as to be electrically coupled to the region. A path of first type conductivity extending from the PN junction through another of the islands to its upper surface is created in the body to complete the basic cell.

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Santa Clara, CA, United States of America

Saiyed A Raza