Chemical-Mechanical Polishing of Group III-V Materials
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Solution Overview
Problem
The microelectronics industry faces challenges in achieving a smooth and planar surface for Group III-V materials during chemical-mechanical polishing due to their small feature size and material selectivity requirements, while also dealing with the hazardous production of toxic gases like arsine and phosphine, which are difficult to control using conventional CMP methods.
Innovation Solution
A chemical-mechanical polishing method using a polishing composition with water, abrasive particles having a negative surface charge, and an oxidizing agent at specific pH levels (2 to 5) is employed to effectively remove Group III-V materials, enhancing removal rates and selectivity while minimizing toxic gas output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional CMP methods are used to polish Group III-V materials, then material removal is achieved, but toxic gases (arsine, phosphine) are produced which are hazardous and difficult to control
Solution Approach 1:
The invention changes the chemical parameters of the polishing slurry by using acidic pH (2-5) and specific oxidizing agents to alter the polishing mechanism, reducing toxic gas evolution while maintaining effective material removal rates for Group III-V materials
Solution Approach 2:
The invention converts the harmful chemical reactivity of Group III-V materials that produces toxic gases into a beneficial controlled chemical-mechanical polishing process where the same reactivity enables effective material removal through controlled oxidation and abrasion mechanisms
2Manufacturing precision
If conventional CMP methods are used on Group III-V materials, then polishing is performed, but achieving smooth and planar surfaces is difficult due to small feature size and material selectivity requirements
Solution Approach 1:
The invention adjusts chemical parameters including pH (2-5), oxidizing agent concentration (0.01-5 wt%), and abrasive particle characteristics to optimize the polishing chemistry for Group III-V materials, achieving superior surface planarity and selectivity without increasing process complexity
Solution Approach 2:
The invention introduces specific chemical intermediaries (oxidizing agents like hydrogen peroxide, nitric acid, or peracetic acid) that mediate between the abrasive particles and Group III-V material surface, enabling controlled material removal and smooth surface finishing
3Productivity
If conventional CMP compositions are used, then polishing is performed, but effective planarization with good removal rates is difficult to achieve
Solution Approach 1:
The invention creates a composite polishing slurry system combining acidic aqueous solution, specific oxidizing agents, and abrasive particles that work synergistically to achieve both high removal rates and excellent planarization quality for Group III-V materials
Solution Approach 2:
The invention optimizes multiple parameters simultaneously including pH (2-5), oxidizing agent type and concentration, abrasive particle size and charge, to achieve the optimal balance between material removal rate and surface planarization quality
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method achieves effective planarization and controlled toxic gas emission, allowing for the use of Group III-V materials in advanced node semiconductor applications with improved surface roughness and reduced hydride gas production.
Implementation Method 1
an oxidizing agent for oxidizing the Group III-V material in an amount of from about 0.01 wt. % to about 5 wt. %
Implementation Method 2
abrading at least a portion of the substrate to polish the substrate
Implementation Method 3
contacting a substrate containing at least one Group III-V material, with a polishing pad and a chemical-mechanical polishing composition
Data Source
AI summary
Disclosed is a method of chemically-mechanically polishing a substrate. The method comprises, consists of, or consists essentially of (a) contacting a substrate containing at least one Group III-V material, with a polishing pad and a chemical-mechanical polishing composition comprising water, abrasive particles having a negative surface charge, and an oxidizing agent for oxidizing the Group III-V material in an amount of from about 0.01 wt. % to about 5 wt. %, wherein the polishing composition has a pH of from about 2 to about 5; (b) moving the polishing pad and the chemical-mechanical polishing composition relative to the substrate; and (c) abrading at least a portion of the substrate to polish the substrate. In some embodiments, the Group III-V material is a semiconductor that includes at least one element from Group III of the Periodic Table and at least one element from Group V of the Periodic Table.