Split gate field effect transistor with a self-aligned control gate
First Claim
1. A method of forming a split gate field effect transistor, comprising:
- providing a substrate having a pair of floating gates, a first conductive material layer between said pair of floating gates, and a first dielectric layer above said first conductive material layer;
forming a control gate having a second dielectric layer above said control gate, wherein said control gate is self-aligned to said pair of floating gates by using said first and second dielectric layers as an etching hard mask; and
forming a pair of source/drain regions into said substrate and beside said pair of floating gates and said control gate.
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Abstract
A method of forming a split gate field effect transistor and a structure of the split gate field effect transistor are provided. The method of forming the split gate effect transistor firstly provides a substrate having a pair of floating gates, a first conductive material layer between the pair of floating gates, and a first dielectric layer above the first conductive material layer. Then a control gate is formed. The control gate has a second dielectric layer above the control gate, wherein the control gate is self-aligned to the pair of floating gates by using the first and second dielectric layers as an etching hard mask. Finally, a pair of source/drain regions are formed into said substrate and beside said pair of floating gates and said control gate.
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Citations
33 Claims
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1. A method of forming a split gate field effect transistor, comprising:
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providing a substrate having a pair of floating gates, a first conductive material layer between said pair of floating gates, and a first dielectric layer above said first conductive material layer;
forming a control gate having a second dielectric layer above said control gate, wherein said control gate is self-aligned to said pair of floating gates by using said first and second dielectric layers as an etching hard mask; and
forming a pair of source/drain regions into said substrate and beside said pair of floating gates and said control gate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A split gate field effect transistor, comprising:
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a substrate;
a gate dielectric layer formed above said substrate;
a floating gate formed above said gate dielectric layer;
an inter-gate dielectric layer formed above said floating gate;
a substantially rectangular control gate formed above said inter-gate dielectric layer, wherein a dielectric layer is formed above said control gate and said control gate is offset said floating gate; and
a pair of source/drain regions formed into said substrate and beside said floating gate and said substantially rectangular control gate. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A structure for forming a split gate effect transistor, comprising:
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a substrate having a pair of floating gates, a first conductive material layer between said pair of floating gates, and a first dielectric layer above said first conductive material layer;
a second conductive material layer formed above said substrate;
a hard mask layer formed above said second conductive material layer; and
a sacrificial layer formed above said hard mask layer. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification