Wafer polishing device with movable window
First Claim
1. A chemical mechanical polishing element comprising:
- a belt comprising a polishing surface, said belt formed in a closed loop; and
a window comprising a first surface and movably disposed within said belt to move between first and second positions, said first surface being closer to said polishing surface in the second position than in the first position.
3 Assignments
0 Petitions
Accused Products
Abstract
A wafer polishing device with movable window can be used for in-situ monitoring of a wafer during CMP processing. During most of the CMP operation, the window remains below a polishing surface of a polishing device to protect the window from the deleterious effects of the polishing process. When the window moves into position between the wafer and a measurement sensor, the window is moved closer to the polishing surface. In this position, at least some polishing agent collected in the recess above the window is removed, and an in-situ measurement can be taken with reduced interference from the polishing agent. After the window is positioned away from the wafer and measurement sensor, the window moves farther away from the wafer and polishing surface. With such a movable window, the limitations of current polishing devices are overcome.
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Citations
35 Claims
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1. A chemical mechanical polishing element comprising:
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a belt comprising a polishing surface, said belt formed in a closed loop; and a window comprising a first surface and movably disposed within said belt to move between first and second positions, said first surface being closer to said polishing surface in the second position than in the first position. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 33, 34)
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2. In a linear chemical mechanical polisher of the type comprising:
- at least two rollers, a belt comprising a polishing surface, said belt mounted to extend between the rollers such that rotation of the rollers drives the belt, and a wafer carrier positioned adjacent the belt to press a wafer into contact with the belt intermediate the rollers, the improvement comprising;
a window comprising a first surface and movably disposed within said belt to move between first and second positions, said first surface being closer to the polishing surface in the second position than in the first position, said window positioned to move intermittently into alignment with the wafer as the belt is driven by the rollers. - View Dependent Claims (12, 13, 14, 15)
- at least two rollers, a belt comprising a polishing surface, said belt mounted to extend between the rollers such that rotation of the rollers drives the belt, and a wafer carrier positioned adjacent the belt to press a wafer into contact with the belt intermediate the rollers, the improvement comprising;
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16. A chemical mechanical polishing element comprising:
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a rotating platen comprising a polishing surface; and a window comprising a first surface and movably disposed within said platen to move between first and second positions, said first surface being closer to said polishing surface in the second position than in the first position. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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17. In a chemical mechanical polisher of the type comprising:
- a rotating platen comprising a polishing surface, means for moving the platen along a rotating polishing path, and a wafer carrier positioned adjacent the polishing element to press a wafer against the polishing surface during a polishing operation;
the improvement comprising;a window comprising a first surface and movably disposed within said rotating platen to move between first and second positions, said first surface being closer to said polishing surface in the second position than in the first position, said window positioned to move intermittently into alignment with the wafer during the polishing operation. - View Dependent Claims (29, 30, 31, 32)
- a rotating platen comprising a polishing surface, means for moving the platen along a rotating polishing path, and a wafer carrier positioned adjacent the polishing element to press a wafer against the polishing surface during a polishing operation;
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18. A chemical mechanical polishing element comprising:
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an orbital platen comprising a polishing surface; and a window comprising a first surface and movably disposed within said platen to move between first position and second positions, said first surface being closer to said polishing surface in the second position than in the first position.
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19. In a chemical mechanical polisher of the type comprising:
- an orbital platen comprising a polishing surface, means for moving the platen along an orbital polishing path, and a wafer carrier positioned adjacent the platen element to press a wafer against the polishing surface during a polishing operation;
the improvement comprising;a window comprising a first surface and movably disposed within said platen movable between first and second positions, said first surface being closer to said polishing surface in the second position than in the first position, said window positioned to move intermittently into alignment with the wafer during the polishing operation.
- an orbital platen comprising a polishing surface, means for moving the platen along an orbital polishing path, and a wafer carrier positioned adjacent the platen element to press a wafer against the polishing surface during a polishing operation;
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35. A method for in-situ monitoring of a wafer while polishing the wafer with a polishing device comprising a polishing surface, said method comprising the steps of:
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(a) providing a polishing device comprising a polishing surface and a window, said window movably disposed within said polishing device to move toward and away from said polishing surface;
then(b) moving said window toward the polishing surface;
then(c) performing an in-situ measurement of said wafer; and
then(d) moving said window away from the polishing surface.
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Specification