Wafer-Edge Protection Film Composition for Uniform Etch-Resistant Coating
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Solution Overview
Problem
Conventional wafer-edge-protection films lack sufficient dry etching resistance and uniform coatability, especially on difficult-to-coat areas, leading to particle generation and metal contamination during semiconductor manufacturing processes, particularly in the formation of patterns with high aspect ratios.
Innovation Solution
A composition for forming a wafer-edge-protection film containing a polymer with a trifunctional structure, combined with a solvent and optional additives like a crosslinking agent, surfactant, and plasticizer, which provides excellent dry etching resistance and uniform coating even on challenging edges, and is applied using a spin coating method followed by heat or optical curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional resist film or metal-containing coating film is used, then the wafer edge can be processed, but particle generation occurs during etching and metal contamination adheres to the wafer edge
Solution Approach 1:
The invention applies a protective film specifically to the wafer edge region, segmenting the substrate into protected edge areas and unprotected central areas. This localized protection prevents particle generation and metal contamination only where needed during etching processes, without affecting the overall substrate processing
Solution Approach 2:
The protective film acts as an intermediary layer between the wafer edge and the etching environment. This film barrier prevents direct contact between the wafer edge and harmful factors such as particles and metal contaminants, thereby protecting the substrate during processing
2Strength
If a metal-containing coating film is formed, then the film provides structural properties, but chemical liquid runs to the wafer edge forming unwanted coating and metal contamination
Solution Approach 1:
The protective film is formed on the wafer edge before the metal-containing coating film is applied. This preliminary protective layer prevents the chemical liquid containing metal from reaching and contaminating the wafer edge during the coating process
Solution Approach 2:
The protective film is applied selectively only to the wafer edge region, providing localized protection against metal contamination. The rest of the substrate remains unprotected, allowing normal coating processes to occur on the central areas
3Productivity
If the wafer edge is exposed during etching, then the substrate can be processed, but the exposed portion is etched generating particles
Solution Approach 1:
The substrate is segmented into protected edge regions and unprotected processing regions. The protective film covers only the wafer edge while leaving the central substrate area exposed for normal etching processing, thus maintaining productivity while preventing particle generation at the edges
4Object-affected harmful factors
If a protection film is formed on the wafer edge, then particle generation and metal contamination are suppressed, but the coating must be uniform on difficult-to-coat edges
Solution Approach 1:
The invention modifies coating parameters including using a specific solvent mixture (high-boiling-point and low-boiling-point solvents), controlling spin coating speed (300-2000 rpm), and adjusting coating temperature to achieve uniform protective film formation on the challenging wafer edge surfaces
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 film effectively prevents particle generation and metal contamination, ensuring reliable protection of the wafer edge during etching processes, even for high aspect ratio patterns, thereby enhancing semiconductor manufacturing productivity and reducing contamination risks.
Implementation Method 1
a polymer (A) having a repeating unit represented by general formula (1)... for forming a wafer-edge-protection film on a peripheral edge of a substrate
Implementation Method 2
a solvent... wherein the polymer (A) has a repeating unit having a trifunctional structure
Data Source
Figure 1(A)~2
Figure 3(A)~3(C)
Figure 4(A)~4(C)
AI summary
The present invention is a composition for forming a wafer-edge-protection film for forming a wafer-edge-protection film on a peripheral edge of a substrate, including a polymer (A) represented by the following general formula (1) and a solvent. In the formula (1), "W" represents -SO2-, -C(=O)-, or -O-; R1, R2, R3, R4, and R5 each independently represent a halogen atom, a monovalent organic group having 1 to 3 carbon atoms, or a hydroxy group; and "a", "b", "c", "d", and "e" each independently represent an integer of 0 to 4. This can provide a composition for forming a wafer-edge-protection film capable of providing a wafer-edge-protection film that can exhibit excellent dry etching resistance and excellent uniform coatablity, even on a wafer edge that is difficult to be coated.