Conductive Polymer Coating for Antistatic E-Beam Lithography
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Solution Overview
Problem
Current conductive polymer compositions for electron beam lithography face challenges such as acid diffusion from the film affecting lithography sensitivity and pattern quality, poor film formability, and inadequate antistatic properties due to the use of strong bases and low hydrophilicity, leading to issues like pattern distortion and charge accumulation.
Innovation Solution
A conductive polymer composition comprising a polyaniline-based conductive polymer with a carboxylic acid salt and a water-soluble polymer, which controls acid diffusion and enhances film formability and antistatic properties, using a carboxylic acid salt to manage acidity and a water-soluble polymer for improved film uniformity and peelability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive polymer has high conductivity for better antistatic properties, then charge dissipation ability improves, but acid diffusion increases affecting lithography sensitivity
Solution Approach 1:
The patent creates a composite material system consisting of polyaniline-based conductive polymer combined with carboxylic acid salt. The polyaniline provides high conductivity and antistatic properties, while the carboxylic acid salt component moderates acid diffusion. The synergistic combination allows the film to maintain both excellent antistatic performance and lithography sensitivity by balancing the contradictory properties through material composition.
2Reliability
If the film thickness is increased to improve antistatic effect, then charge dissipation improves, but peelability and washing performance deteriorate
Solution Approach 1:
The patent utilizes parameter changes in the chemical composition, specifically the incorporation of carboxylic acid salt which enhances water solubility and film uniformity. This compositional parameter change allows the film to maintain adequate antistatic effect while improving peelability and washing performance, as the carboxylic acid salt facilitates easier removal of the conductive polymer film from the resist without requiring excessive film thickness.
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 achieves high conductivity, excellent antistatic properties, and improved film quality with reduced acid diffusion, enabling precise electron beam writing and high-resolution patterns without the adverse effects of strong bases, ensuring effective charge dissipation and easy peeling with water or alkaline developers.
Implementation Method 1
acid diffusion from the film affecting lithography sensitivity and pattern quality
Implementation Method 2
conductive polymer having a lower resistivity and a higher charge dissipation ability
Implementation Method 3
crosslinking or decomposition reaction of a thin film is induced by irradiation of light
Data Source
AI summary
An object of the present invention is to provide a conductive polymer composition which has good filterability and good film formability of a flat film on an electron beam resist and can be suitably used for an antistatic film for electron beam resist writing, showing excellent antistatic property in the electron beam writing process due to the property of low volume resistivity (Ω·cm), and, reducing an effect on lithography by making an effect of an acid diffused from the film minimum, and further having excellent peelability by H2O or an alkaline developer after writing. A conductive polymer composition which comprises (A) a polyaniline-based conductive polymer having at least one kind or more of a repeating unit represented by the following general formula (1), and (B) a carboxylic acid salt represented by the following general formula (2):