Anti-Spacer Masking Using Switchable Polymer Solubility
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Solution Overview
Problem
Existing photolithography methods for semiconductor manufacturing face challenges in achieving high-resolution patterning without the complexity and cost associated with multiple patterning processes, particularly in forming anti-spacer masks due to the incompatibility of polar and non-polar developers.
Innovation Solution
A method involving the use of solubility shifting agents to transform a protected polymer in a patterned resist layer, allowing it to switch solubility from non-polar to polar developers, enabling the formation of anti-spacer patterns by selectively removing protected regions with a polar developer while preserving the resist layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple patterning processes are used to achieve high-resolution patterning, then manufacturing precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies parameter changes by utilizing solubility shifting agents to alter the solubility characteristics of the photoresist material. By changing the chemical environment (pH, solvent polarity), the same photoresist layer can be selectively dissolved in different regions using a single patterning process, achieving high-resolution patterns without requiring multiple sequential patterning steps.
Solution Approach 2:
The patent introduces solubility shifting agents as intermediary substances that mediate between the photoresist material and the developer. These agents modify the interaction between the photoresist and developer, enabling selective dissolution of specific regions based on their chemical composition rather than requiring complex mechanical or optical multiple patterning processes.
2Manufacturing precision
If polar and non-polar developers are used to dissolve different regions, then manufacturing precision is improved, but ease of manufacture deteriorates due to incompatibility
Solution Approach 1:
The patent resolves the incompatibility between polar and non-polar developers by changing the chemical parameters of the developer system. By incorporating solubility shifting agents, the developer can be formulated to selectively dissolve either polar or non-polar photoresist regions, making the same developer compatible with both types of regions without requiring separate development processes.
Solution Approach 2:
The patent creates composite photoresist layers containing both polar and non-polar regions with different solubility characteristics. By depositing multiple photoresist layers or using blended photoresist compositions, the patent achieves regions that can be selectively dissolved by a single developer system, eliminating the need for incompatible separate development processes.
3Manufacturing precision
If over-coating and etching steps are used to form anti-spacer masks, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The patent segments the photoresist layer into distinct polar and non-polar regions during the initial coating process, rather than requiring subsequent over-coating and etching steps. By incorporating solubility shifting agents during the photoresist deposition, the material is pre-divided into regions with different dissolution characteristics, enabling single-step patterning that maintains precision while improving productivity.
Solution Approach 2:
The patent performs preliminary action by pre-modifying the photoresist material with solubility shifting agents before the patterning process. This preliminary chemical modification creates regions with different solubilities in advance, eliminating the need for subsequent over-coating and etching steps, thereby reducing process steps and increasing throughput while maintaining anti-spacer mask formation accuracy.
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 approach simplifies the process by reducing the need for complex over-coating and etching steps, enhances patterning resolution, and increases compatibility with high-volume manufacturing by allowing precise formation of anti-spacer masks using a single developer.
Implementation Method 1
transforming a protected polymer in a patterned resist layer, allowing it to switch solubility from non-polar to polar developers
Implementation Method 2
solubility shifting agents to transform a protected polymer in a patterned resist layer, allowing it to switch solubility from non-polar to polar developers
Implementation Method 3
at least a catalyst portion of a second solubility shifting agent is provided to the overburden region of the second intermediate structure and chemically transforming the overburden region
Data Source
AI summary
A method for forming a patterned mask includes providing first and second structures. The first structure includes a first material including a first polymer, and a first converted region of a second material extending into the first structure. The second material has been chemically transformed from the first material by a catalyst portion of a first solubility shifting agent diffused into the first converted region. The second structure includes a third material including a second polymer with a functional group protected by a protecting group, and has an overburden region overlying the first converted region. The method further includes chemically transforming the overburden region to a second converted region of a fourth material using a catalyst portion of a second solubility shifting agent. The first and third materials are insoluble in a developer containing a polar solvent and the second and fourth materials are soluble in the developer.