Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Low friction planarizing/polishing pads and use thereof

a technology of low friction and planarizing, applied in the field of pads, can solve the problems of reducing the removal rate, reducing the efficiency of the process, so as to reduce the removal rate and reduce the friction of the process

Inactive Publication Date: 2005-02-24
IBM CORP
View PDF23 Cites 50 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0043] An advantage of the present invention as compared to including solid lubricant particles in the slurry is that the friction of the process can be smaller than with slurries because larger amounts of solid lubricant particles can be incorporated into the pad material then into the slurry without reducing the removal rate to non-economical values.
[0044] An embodiment of a pad, suitable for the semiconductor industry, is a substantially cylindrical pad having general dimensions such that it might be used in a polishing apparatus, for example in the equipment described in the IBM Technical Disclosure Bulletin, Vol. 15, No. 6, November 1972, pages 1760-1761, the entire contents of which are incorporated herein by reference.
[0045] The parameters of the polishing or planarizing can be determined by those skilled in the art, once aware of this disclosure, without exercising undue experimentation. For instance, the speed of rotation of the polishing pads and also of the wafer is about 10 to about 150 rpm and pressure about 2 to 10 psi. A wafer may be in the range of 100 to 300 mm in diameter.
[0046] The following non-limiting Examples are presented to further illustrate the present invention.

Problems solved by technology

The deviation from perfect planarity, referred to as a step, is detrimental due to depth-of-focus issues in subsequent lithography steps.
Also, this deviation in the case of oxide polish can lead to field threshold problems in isolation regions, while in the case of metal planarization can cause shorts in the next metal level.
Another obstacle of using solid lubricant particles in the slurry is that due to the chemical inertness of PTFE, it is not easy to create a hydrophilic dispersion to be used with water-base abrasive slurries.
Consequently only a very limited number of vendors commercially offer such dispersions.
The current approach is to use very low down force to reduce friction which results in non-economical removal rates.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low friction planarizing/polishing pads and use thereof
  • Low friction planarizing/polishing pads and use thereof
  • Low friction planarizing/polishing pads and use thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0047] A porous polyurethane pad is provided according to the method in U.S. Pat. No. 5,900,164 by mixing liquid urethane with a polyfunctional amine at a proper temperature in the ratio required by the desired amount of cross-linking. During the “low viscosity window” hollow elastic polymeric microspheres are blended with the polymers mixture and 2% by weight of PTFE solid lubricant particles of 0.2 micron average diameter available under the trade name of Pinnacle 9003 by Carroll Scientific Inc., are blended applying a high shear rate mixer. The solid lubricant particles can be added to the liquid urethane or the liquid urethane-polyfunctional amine mixture, or the liquid urethane-polyfunctional amine-microspheres mixture.

[0048] The mixture is transferred during the low viscosity window to a convention mold and permitted to gel. It is subsequently cured in an oven, cooled and cut to form polishing pads. FIG. 3 shows the cross-section of a planarizing pad according to the present ...

example 2

[0050] In producing a non-porous pad the process of Example 1 is followed except that the hollow microspheres are not added. Thus a liquid urethane is mixed with a polyfunctional amine at a proper temperature in a ratio required by the desired amount of cross-linking. During the “low viscosity window” 3% by weight of PTFE solid lubricant particles of 0.2 micron average diameter with the trade name of Pinnacle 9003 by Carroll Scientific Inc. are blended into the liquid polymer mix applying a high shear rate mixer. The lubricant particles can be added into the liquid urethane, or into the liquid urethane-polyfunctional amine mixture.

[0051] The mixture is transferred during the low viscosity window to a conventional mold and permitted to gel. It is subsequently cured in an oven, cooled and cut to form a polishing pad. Since this pad does not transport slurry well a surface texture providing macroscopic channels for slurry transport is mechanically produced on the surface of the pad be...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Percent by massaaaaaaaaaa
Percent by massaaaaaaaaaa
Percent by massaaaaaaaaaa
Login to View More

Abstract

A polishing pad comprising a polymeric matrix and solid lubricant particles is useful for planarizing surfaces, and preventing delamination and scratches.

Description

TECHNICAL FIELD [0001] The present invention relates to pads and use thereof. The pads are especially useful for planarizing and polishing surfaces in the microelectronics industry. More particularly the present invention relates to increasing the topological selectivity of planarizing / polishing pads by providing pads containing a polymeric matrix and solid lubricant particles. An added advantage of the pads of the present invention is that the reduced friction between the pads and surface being planarized / polished e.g.—wafer reduces delamination (peeling) due to planarization / polishing, which is particularly important in planarizing conductor lines embedded in low-k (i.e. low dielectric constant) insulators or porous low-k insulators or planarizing the insulators themselves. Furthermore, such pads reduce defects such as scratches. BACKGROUND OF THE INVENTION [0002] In microelectronics planarization metal or insulator layers are deposited conformally into etched trenches of a substr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B24B37/04B24D3/32B24D3/34
CPCB24B37/24B24D3/346B24D3/32
Inventor RONAY, MARIA
Owner IBM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com