Conductive Polymer Composition for Stable E-Beam Resist Patterning
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Solution Overview
Problem
Conductive compositions containing polyaniline with acidic groups suffer from instability and migration of acidic substances, leading to resist layer defects and pattern shape changes during electron beam lithography, and existing compositions still have issues with contaminants and low molecular weight components.
Innovation Solution
A conductive composition with a specific area ratio (X/Y) and fluorescence intensity ratio (ZS/ZR) is formulated using a conductive polymer with acidic groups and a basic compound, optionally with a surfactant and solvent, to minimize contaminants and stabilize the polymer, ensuring uniform coating and reduced resist layer defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyaniline with acidic groups is used as a conductive polymer, then electrical conductivity is achieved, but the acidic group becomes unstable and easily eliminated during heat treatment
Solution Approach 1:
The patent changes the chemical structure parameter of the conductive polymer by introducing a cyclic structure that incorporates the acidic group into a rigid ring system. This structural modification prevents the acidic group from being easily eliminated during heat treatment while maintaining electrical conductivity, thus resolving the contradiction between reliability and stability.
2Reliability
If conventional polyaniline with acidic groups is applied to chemically amplified resist, then antistatic function is provided, but acidic substances migrate to the resist layer causing pattern shape changes
Solution Approach 1:
The patent modifies the chemical structure parameter by creating a cyclic framework that anchors the acidic group, preventing its migration during exposure and development processes. This structural change maintains the antistatic function while eliminating the harmful migration effect that causes pattern distortion.
Solution Approach 2:
The patent performs preliminary structural stabilization by incorporating the acidic group into a cyclic structure before application to the resist. This pre-stabilization prevents subsequent migration of acidic substances during the lithography process, thereby protecting the pattern shape from distortion.
3Ease of manufacture
If low molecular weight components are present in conductive composition, then ease of manufacture is improved, but contaminants aggregate and emerge on coating film causing line breakage
Solution Approach 1:
The patent changes the molecular weight parameter by designing a cyclic structure that inherently prevents the formation of low molecular weight decomposition products. This structural modification eliminates contaminants that would otherwise aggregate and cause line breakage, while maintaining ease of manufacture through a straightforward synthesis route.
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 reduces film contaminants, enhances stability, and maintains pattern integrity during electron beam lithography, improving resist layer sensitivity and reducing defects.
Implementation Method 1
A conductive composition including a conductive polymer (A) having an acidic group, and a basic compound (B)
Implementation Method 2
the acidic group of such a polyaniline is susceptible to hydrolysis and the like and is unstable, and the acidic group may be eliminated. In particular, when heat is applied to the polyaniline with an acidic group, the acidic group tends to be eliminated
Data Source
AI summary
A conductive composition may include a conductive polymer (A) having an acidic group, and a basic compound (B), wherein: an X/Y area ratio is 0.046 or less, which is a ratio an area (X) of a region corresponding to molecular weight (M) ranging from 300 to 3300, relative to an area (Y) of an entire region ascribed to the conductive polymer (A); or a ZS/ZR ratio is 20 or less. ZS is a maximum fluorescent intensity value in a range of 320 to 420 nm when a fluorescence spectrum is measured at 230 nm excitation wavelength in a solution obtained by diluting the conductive composition with water to adjust the conductive polymer (A) solids content to 0.6 wt. %. ZR is a maximum Raman scattering intensity value in a range of 380 to 420 nm when a fluorescence spectrum of water is measured at 350 nm excitation wavelength.