Block Copolymer Coating for Semiconductor Lithography
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Solution Overview
Problem
Conventional methods for forming fine patterns in semiconductor devices face challenges due to optical limitations, particularly in achieving regionally selective and heat-resistant films that are wet detachable, while also providing blocking performance against metal oxide formation during ALD or CVD processes.
Innovation Solution
A composition comprising a polymer with a ring structure and functional groups capable of bonding to metal atoms, combined with a solvent, is applied to a base with a metal atom surface layer, forming a coating film that is heated to create a regionally selective, heat-resistant, and wet detachable film with superior blocking performance against metal oxide formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lithography methods are used for forming fine patterns, then optical factors and technical difficulties arise, but the method is simple and well-established
Solution Approach 1:
The patent replaces conventional optical lithography with a bottom-up self-assembly approach using block copolymers. The mechanical/optical system of lithography is substituted with a chemical self-organization system where block copolymers spontaneously form nanoscale patterns through phase separation, achieving sub-30nm line widths without optical limitations.
Solution Approach 2:
The block copolymer system performs self-service by automatically organizing into desired nanoscale patterns through directed self-assembly. The polymer chains spontaneously segregate into domains with characteristic dimensions determined by their molecular architecture, eliminating the need for complex optical alignment and exposure processes.
2Reliability
If a coating film is formed to block metal oxide formation during ALD or CVD processes, then blocking performance improves, but the film must be removed later adding process steps
Solution Approach 1:
The patent utilizes changes in chemical parameters (pH, solvent composition) to control the properties of the coating film. By adjusting the solvent system and polymer chemistry, the film transitions from a state that provides excellent blocking performance during ALD/CVD to a state that is easily removable by wet processes, achieving both high reliability and process simplicity through parameter optimization.
Solution Approach 2:
The coating film is formed using block copolymers with specific functional groups that create a composite structure at the molecular level. The film combines blocking functionality (through metal atom coordination) with removable functionality (through selective chemical bonding), allowing it to serve multiple purposes: protecting during deposition and enabling subsequent removal without damaging the underlying metal layer.
3Reliability
If a polymer with functional groups capable of bonding to metal atoms is used, then heat resistance and selective bonding improve, but the polymer structure becomes more complex
Solution Approach 1:
The patent applies local quality by incorporating functional groups (such as carboxylic acid, hydroxyl, or amine groups) only at specific locations within the block copolymer structure, particularly at the interfaces between different polymer blocks. This localized placement of functional groups provides heat resistance and selective metal bonding capability without requiring the entire polymer structure to be complex, maintaining simplicity in non-functional regions.
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 solution enables regionally selective and heat-resistant film formation on semiconductor device surfaces, enhancing microfabrication processes by allowing for improved blocking performance against metal oxide formation during ALD or CVD processes and facilitating easy removal without damaging the base.
Implementation Method 1
The polymer includes: a structural unit including a ring structure; and a functional group capable of bonding to the metal atom
Implementation Method 2
The coating film is heated
Implementation Method 3
providing blocking performance against metal oxide formation during ALD or CVD processes
Data Source
AI summary
A composition includes a polymer and a solvent. The polymer includes: a structural unit including a ring structure; and a functional group capable of bonding to a metal atom. An atom chain constituting the ring structure constitutes a part of a main chain of the polymer. The polymer preferably includes at an end of the main chain or at an end of a side chain, a group including the functional group. The functional group is preferably a cyano group, a phosphono group, or a dihydroxyboryl group. The ring structure preferably includes an alicyclic structure.