Dielectric layer of a memory cell having a stacked oxide sidewall and method of fabricating same
First Claim
1. A method of fabricating a memory cell of a semiconductor device, comprising the steps of:
- (a) depositing a conductive layer having a top surface and a side surface;
(b) forming an ONO film adjacent to the top surface of the conductive layer; and
(c) forming a stacked oxide layer adjacent to the side surface of the conductive layer, wherein the step of forming the stacked oxide layer comprises the steps of;
(i) depositing a SiO2 layer on the side surface of the conductive layer;
(ii) heating the SiO2 layer in an oxygen-containing gas; and
(iii) oxidizing the SiO2 layer.
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Abstract
A merged two-transistor memory cell of an EEPROM, and method of fabricating the cell, are provided. The memory cell includes a substrate and gate oxide layer formed on the substrate. It also includes a memory transistor having a floating gate and a control gate, and a select transistor having a gate that is shared with the memory transistor. The memory cell is configured so that the shared gate serves both as the control gate of the memory transistor and the wordline of the select transistor. The memory cell further includes a dielectric layer that is disposed between the floating gate and the shared gate. The dielectric layer is defined by an ONO film and a stacked oxide layer. In fabricating the memory cell, the ONO stack film is formed adjacent to the top surface of the floating gate and the stacked oxide layer is formed adjacent to the side surface of the floating gate.
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Citations
11 Claims
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1. A method of fabricating a memory cell of a semiconductor device, comprising the steps of:
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(a) depositing a conductive layer having a top surface and a side surface; (b) forming an ONO film adjacent to the top surface of the conductive layer; and (c) forming a stacked oxide layer adjacent to the side surface of the conductive layer, wherein the step of forming the stacked oxide layer comprises the steps of; (i) depositing a SiO2 layer on the side surface of the conductive layer; (ii) heating the SiO2 layer in an oxygen-containing gas; and (iii) oxidizing the SiO2 layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification