Salicided MOS device and one-sided salicided MOS device, and simultaneous fabrication method thereof
First Claim
1. A structure of a salicided MOS device and a one-sided salicided MOS device, comprising:
- a semiconductor substrate;
a first MOS device and a second MOS device formed on the substrate, wherein the first MOS device comprises a first gate structure formed on the substrate, first and second doped regions formed in the substrate, and the second MOS device comprises a second gate structure formed on the substrate, and third and fourth doped regions formed in the substrate;
a spacer formed on a sidewall of the second gate structure, wherein the spacer is located on part of the fourth doped region;
a conformal insulation layer formed over the fourth doped region and a side of the second gate structure near the fourth doped region, wherein part of the conformal insulation layer overlies the spacer;
a salicided layer formed on the first gate structure, the first doped region, the second doped region, the second gate structure and the third doped region but not the fourth doped region; and
a capacitor electrically coupled to the fourth doped region, wherein part of the conformal insulation layer overlies the capacitor.
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Abstract
A method of fabricating a salicided MOS and a one-sided salicided MOS device on a semiconductor substrate. A conformal oxide layer and an organic layer are sequentially formed on first and second MOS devices and the substrate. The first MOS has a first gate structure, a first spacer and first and second doped regions. The second MOS has a second gate structure, a second spacer and third and fourth doped regions. Anisotropic etching is performed to remove part of the organic layer until the oxide layer on the first and the second gate structures is exposed, wherein a remaining organic layer is left above the substrate. The oxide layer on the first and the second gate structures is removed. The remaining organic layer is removed. The oxide layer on the first, second, and third doped regions is removed. Thus, a silicide layer cannot form on the fourth doped region.
17 Citations
17 Claims
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1. A structure of a salicided MOS device and a one-sided salicided MOS device, comprising:
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a semiconductor substrate;
a first MOS device and a second MOS device formed on the substrate, wherein the first MOS device comprises a first gate structure formed on the substrate, first and second doped regions formed in the substrate, and the second MOS device comprises a second gate structure formed on the substrate, and third and fourth doped regions formed in the substrate;
a spacer formed on a sidewall of the second gate structure, wherein the spacer is located on part of the fourth doped region;
a conformal insulation layer formed over the fourth doped region and a side of the second gate structure near the fourth doped region, wherein part of the conformal insulation layer overlies the spacer;
a salicided layer formed on the first gate structure, the first doped region, the second doped region, the second gate structure and the third doped region but not the fourth doped region; and
a capacitor electrically coupled to the fourth doped region, wherein part of the conformal insulation layer overlies the capacitor. - View Dependent Claims (2, 3, 4, 5)
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6. A structure of a one-sided salicided MOS device, suitable for a CMOS image sensor, the CMOS image sensor comprising:
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a semiconductor substrate;
a MOS device formed on the substrate, wherein the MOS device has a gate structure on the substrate, first and second doped regions formed in the substrate, a first spacer formed on a first sidewall of the gate structure and a second spacer formed on a second sidewall of the gate structure, wherein the first spacer is located on part of the first doped region and the second spacer is located on part of the second doped region;
a photodiode region formed in the substrate, wherein the photodiode region electrically couples to the second doped region;
a conformal insulation layer formed on the second doped region, the second spacer and the photodiode region; and
a salicided layer formed on the gate structure and the first doped region but not the second doped region and the photodiode region, wherein the conformal insulation layer is lower than a top surface of the salicided layer on the gate structure;
wherein a double insulator, comprising the second spacer and part of the conformal insulation layer, is disposed on the second sidewall of the gate structure, and a single insulator, comprising the first spacer, is disposed on the first sidewall of the gate structure. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A structure of a salicided MOS device and a one-sided salicided MOS device, comprising:
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a semiconductor substrate;
a first MOS device and a second MOS device formed on the substrate, wherein the first MOS device comprises a first gate structure formed on the substrate, first and second doped regions formed in the substrate, and the second MOS device comprises a second gate structure formed on the substrate, and third and fourth doped regions formed in the substrate;
a conformal insulation layer formed over the fourth doped region and a side of the second gate structure near the fourth doped region;
a salicided layer formed on the first gate structure, the first doped region, the second doped region, the second gate structure and the third doped region but not the fourth doped region, wherein the conformal insulation layer is lower than a top surface of salicided layer on the second gate structure; and
a capacitor electrically coupled to the fourth doped region, wherein part of the conformal insulation layer overlies the capacitor. - View Dependent Claims (15, 16, 17)
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Specification