Conductive Polymer Composition for Electron Beam Lithography
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Solution Overview
Problem
Current antistatic films for electron beam lithography face challenges such as re-aggregation during storage, poor hydrophilicity, and inadequate antistatic performance due to fixed doping ratios and low electric conductivity, which affect film formability and peelability, leading to defects in lithography.
Innovation Solution
A conductive polymer composition comprising a polyaniline-based conductive polymer with multiple repeating units and a dopant polymer with a sulfo group, along with an amphoteric ion compound, to achieve lower surface resistivity and improved peelability with water or alkaline developers, enhancing antistatic performance and film quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a π-conjugated conductive polymer with an introduced acidic substituent is used to form an antistatic film, then the antistatic effect is achieved, but the doping ratio and solubility cannot be adjusted freely leading to re-aggregation during storage
Solution Approach 1:
The invention separates the conductive polymer and dopant into two independent components. The conductive polymer (polyaniline or its derivatives) and the dopant (polyacid or polybase) can be independently synthesized and stored, then combined in desired ratios before application. This segmentation allows flexible adjustment of doping ratios without compromising the stability of individual components during storage, eliminating the re-aggregation problem while maintaining antistatic functionality.
Solution Approach 2:
The invention introduces a soluble dopant (polyacid or polybase) as an intermediary that can be independently controlled. This intermediary component allows precise control over the doping process by adjusting the ratio of dopant to conductive polymer in the coating solution, enabling optimization of both antistatic performance and solubility without the constraints of pre-introduced acidic substituents.
2Ease of manufacture
If substituents are introduced into the aniline skeleton to improve dispersibility and film formability, then hydrophilicity is improved, but electric conductivity decreases
Solution Approach 1:
The invention applies local quality by keeping the aniline backbone unsubstituted to maintain high electric conductivity, while introducing hydrophilic groups only on the dopant molecules (polyacid or polybase). This spatial separation ensures that the conductive polymer chains retain their intrinsic high conductivity, while the dopant provides the necessary hydrophilicity and water solubility for easy film formation and removal, resolving the contradiction between conductivity and processability.
Solution Approach 2:
The invention creates a composite material system consisting of unsubstituted polyaniline (or derivatives) combined with specifically designed polyacid or polybase dopants. This composite approach allows the conductive polymer to provide high electric conductivity while the polymeric dopant contributes hydrophilicity and water solubility. The synergistic combination achieves both high conductivity and excellent film formability without the need to compromise the aniline skeleton structure.
3Manufacturing precision
If the resist is coated with a conductive polymer film to prevent electrification, then drawing accuracy is improved, but the film cannot be easily removed after use
Solution Approach 1:
The invention utilizes parameter changes by designing the dopant with specific functional groups (carboxyl, sulfonic acid, or ammonium groups) that confer water solubility to the composite film. After electron beam lithography, the entire conductive polymer-dopant composite can be easily removed by washing with water, eliminating the need for complex removal processes. This parameter change in solubility maintains drawing accuracy during use while enabling simple film removal afterward.
4Reliability
If a fixed doping ratio of 1:1 is used between acidic substituent and monomer, then self-doping is achieved, but the ratio cannot be altered to adapt to different applications
Solution Approach 1:
The invention introduces dynamics by allowing the doping ratio to be variable rather than fixed. The dopant (polyacid or polybase) and conductive polymer are mixed in coating solutions at controllable ratios, enabling the doping level to be dynamically adjusted according to specific application requirements. This dynamic control is achieved by varying the concentration of dopant relative to conductive polymer in the coating formulation, providing flexibility for different antistatic performance levels and film thickness requirements.
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 provides excellent antistatic performance with high positional accuracy and improved film formability, preventing charge accumulation and ensuring high-resolution resist patterns without defects, even after electron beam drawing.
Implementation Method 1
a dopant polymer which contains a repeating unit shown by general formula (2)... comprising a polyaniline-based conductive polymer and a dopant polymer
Implementation Method 2
wherein the conductive polymer composition moderates an acidity by using (C) an amphoteric ion compound
Data Source
AI summary
The present invention is a conductive polymer composition including: (A) a polyaniline-based conductive polymer having two or more kinds of repeating units shown by the following general formula (1); and (B) a dopant polymer which contains a repeating unit shown by the following general formula (2) and has a weight-average molecular weight in a range of 1,000 to 500,000. This provides a conductive polymer composition having good filterability and film-formability of a flat film onto an electron beam resist, and being suitably usable for a antistatic film for electron beam resist drawing having lower surface resistivity (Ω/□) to show excellent antistatic performance in an electron beam drawing process, and excellent peelability with H2O or an alkaline developer after drawing.