Trapezoidal CMP groove pattern
US10857648B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 2017 |
| Grant date | Dec 8, 2020 |
| Priority date | — |
| Expiry date | Oct 5, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L21/30625
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
The polishing pad is suitable for polishing or planarizing a wafer of at least one of semiconductor, optical and magnetic substrates. The polishing pad includes a polishing layer having a polymeric matrix and radial feeder grooves in the polishing layer separating the polishing layer into polishing regions. The radial feeder grooves extend at least from a location adjacent the center to a location adjacent the outer edge of the polishing pad. Each polishing region includes a series of spaced non-isosceles trapezoid groove structures having parallel base segments connecting two adjacent radial feeder grooves to form leg segments. The series of non-isosceles trapezoid groove structures extend from adjacent the outer edge toward the center of the polishing pad with the perimeter of the series of trapezoid structures also being a trapezoid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.