Cerium Oxide Particles with High Roughness Index for CMP
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current cerium oxide particles used in chemical mechanical polishing (CMP) compositions face challenges in achieving a balance between abrasive efficiency and low defectuosity, with fine particles reducing abrasive capacity and larger particles increasing defectuosity, while existing methods for producing these particles are not simple, economical, or easily scalable.
Innovation Solution
Development of cerium oxide particles with a high roughness index (RI) of at least 5, produced through a process involving an inert atmosphere, aqueous solutions of bases and nitrates, thermal treatment, and mechanical deagglomeration, resulting in spheroidal particles with enhanced polishing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fine particles (less than 300 nm) are used in CMP compositions, then stability and ease of use are improved, but abrasive capacity is reduced
Solution Approach 1:
The invention applies local quality by creating particles with non-uniform surface morphology - specifically, particles that are smooth in some regions but possess localized rough zones with elevated roughness indices (RI ≥ 5). This localized surface heterogeneity allows the particle to maintain overall fine dimensions for stability while providing localized high-roughness contact points that enhance abrasive capacity during CMP operations.
2Productivity
If larger particles are used in CMP compositions, then abrasive capacity is improved, but defectuosity increases
Solution Approach 1:
The invention changes the surface morphology parameter of the particles by introducing controlled roughness features (RI ≥ 5) on specific particle surfaces while maintaining the overall particle size within the fine particle range (<300 nm). This parameter transformation enables the particles to deliver enhanced abrasive capacity through increased surface asperity contact, while the controlled size distribution prevents excessive defect formation on polished substrates.
3Manufacturing precision
If complex particle synthesis methods are used, then particle performance is improved, but manufacturing complexity increases
Solution Approach 1:
The invention employs an organic acid as a intermediary agent during the sol-gel synthesis process. This organic acid mediator controls the hydrolysis and condensation reactions of metal alkoxides, enabling the formation of particles with the desired rough surface morphology (RI ≥ 5) through a relatively simple one-pot synthesis approach, thereby avoiding complex multi-step manufacturing procedures while achieving superior particle performance.
Data Source
AI summary
The invention relates to cerium oxide particles having a roughness index RI of at least 5, to a making process thereof and to the use thereof in chemical mechanical polishing applications.