Polishing Composition for Group III-V Semiconductors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional polishing compositions for group III-V compound semiconductor substrates excessively polish the group III-V compound material portion when used on objects containing both group III-V and silicon materials, leading to difficulties in preventing level differences caused by etching on the polished surface.
Innovation Solution
A polishing composition comprising abrasive grains, an oxidizing agent, and a water-soluble polymer, where the water-soluble polymer is adsorbed on the abrasive grains, enhancing the polishing rate while reducing etching-induced level differences by improving surface wettability and reducing dishing or erosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional polishing composition for group III-V compound semiconductor substrate is used, then polishing rate of group III-V compound material portion is improved, but level difference caused by etching occurs on polished surface
Solution Approach 1:
A water-soluble polymer is introduced as an intermediary substance in the polishing composition. This polymer selectively adsorbs onto the group III-V compound material portion during polishing, forming a protective layer that prevents excessive etching while allowing the abrasive grains to maintain effective polishing action. The polymer acts as a mediator between the abrasive grains and the semiconductor substrate, enabling differential removal rates that preserve surface flatness.
Solution Approach 2:
The polishing composition modifies its chemical parameters by incorporating a water-soluble polymer that changes the local chemical environment at the polishing interface. The polymer's presence alters the etching kinetics by forming a protective adsorption layer on the group III-V compound material, thereby changing the removal mechanism from purely mechanical abrasion to a controlled combination of abrasion and chemical reaction, which suppresses excessive etching.
2Productivity
If polishing composition is designed to achieve high polishing rate, then productivity is improved, but etching occurs excessively on group III-V compound material portion
Solution Approach 1:
The water-soluble polymer serves as a protective intermediary that selectively binds to the group III-V compound material portion during the polishing process. This intermediary layer reduces the harmful chemical interaction between the abrasive grains/oxidizing agent and the semiconductor material, thereby suppressing etching while preserving the high polishing rate achieved through the abrasive action.
Solution Approach 2:
The invention converts the potentially harmful etching effect into a beneficial selective removal process. By controlling the etching rate through polymer adsorption, the process achieves differential removal where material is removed at the desired rate without excessive etching, transforming the harmful side effect into a controlled and useful aspect of the polishing mechanism.
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
The composition effectively suppresses the occurrence of level differences caused by etching on the polished surface of objects containing group III-V compound materials, enhancing the polishing rate and surface quality.
Implementation Method 1
the water-soluble polymer is adsorbed on the abrasive grains at 5,000 or more molecules per 1 μm2 of the surface area of the abrasive grains
Implementation Method 2
The polishing composition contains abrasive grains, an oxidizing agent, and a water-soluble polymer
Data Source
AI summary
A polishing composition of the present invention is to be used for polishing an object including a portion containing a group III-V compound material. The polishing composition contains abrasive grains, an oxidizing agent, and a water-soluble polymer. When the polishing composition is left to stand for one day in an environment with a temperature of 25° C., the water-soluble polymer may be adsorbed on the abrasive grains at 5,000 or more molecules per 1 μm2 of the surface area of the abrasive grains. Alternatively, the water-soluble polymer may be a compound that reduces the water contact angle of the portion containing a group III-V compound material of the object after being polished with the polishing composition.