Abstract:
PURPOSE: A method for forming a single crystal STAR(Stacked Array) structure and a three dimensional NAND flash memory array using the same are provided to independently contact each layer through one photolithography process by etching each semiconductor layer of a contact unit with a step shape. CONSTITUTION: A contact unit(116) is formed by vertically laminating a plurality of single crystal semiconductor layers while interposing an insulation layer. A cell forming unit(216) is connected to each single crystal semiconductor layer of the contact unit through two or more lines. The insulation layer is formed between the lines. The plurality of single crystal semiconductor layers is vertically laminated. A plurality of control gates(300) vertically surrounds two or more lines adjacent to a plurality of line selection gates and is horizontally separated while interposing the insulation layer with a charge storage layer. A ground selection gate vertically surrounds two or more lines while interposing the gate insulation layer.
Abstract:
PURPOSE: A one-time programmable nonvolatile memory array and a method for operating and manufacturing the same are provided to perform a reading operation using a PN junction or a Schottky junction, thereby highly integrating a memory array by an existing lithographically process. CONSTITUTION: Bit lines(BL1, BL2) are formed on a semiconductor substrate(12a) by a first semiconductor material. One or more word lines(WL1, WL2, WL3) are formed by a conductive material. A second semiconductor material(16a) is interposed between the bit lines and word lines to form a PN junction with the bit lines. An insulating film(44) is formed between the second semiconductor material and the word lines. The semiconductor substrate and the second semiconductor material are P-type semiconductors.
Abstract:
PURPOSE: A nand flash memory array having pillar type single crystal channel and a virtual source/drain and fabrication method of the same are provided to simply implement a plurality of gates by repeatedly depositing and etching an insulating film and a conductive film. CONSTITUTION: In a nand flash memory array having pillar type single crystal channel and a virtual source/drain and fabrication method of the same, a column(12) is formed on a substrate(10). A common source area(40) is formed on the substrate between columns to form a first impurity doping layer. A lower selection gate(53) is formed on a common source region and the column while having a first insulating layer(24a) between them. A word line is formed on the lower selection gate and the column. An upper selection gate(75) is formed on a conductive layer(74) and each column while having a third insulating film(67).
Abstract:
PURPOSE: A memory cell having a raised body for a storage node and a fabrication method of the same are provided to prevent SRH recombination by forming a protruded body and performing high doping on one side of the body. CONSTITUTION: A source(24) and a drain(28) are formed on a buried oxide of an SOI substrate and are separated from each other. A body region(26) is interposed between the source and the drain and is higher than them. The body region is protruded to be 1.5-2 times as high as the source and the drain. A gate(42) is formed on at least one side of the body region while having an insulating layer between the gate and the source. Two gates are formed at both ends of the body region and have the insulating layer between the two gates.