Guanidine Developer for Lithography Pattern Integrity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the context of microelectronic device manufacturing, particularly in electron beam (EB) and extreme ultraviolet (EUV) lithography, there is a challenge in achieving minimal edge roughness and preventing pattern collapse or bridge defects during the development process, as existing resist materials face issues with sensitivity, dry etch resistance, and acid diffusion, leading to reduced resolution and increased edge roughness.
Innovation Solution
A developer in the form of an aqueous solution containing 0.1 to 10% by weight of guanidine is used to develop chemically amplified positive resist compositions, which accelerates alkaline dissolution and minimizes swell, thereby reducing edge roughness and preventing pattern collapse. The solution includes specific guanidine compounds and optional acetylene alcohols for defoaming and surface activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the accelerating voltage of the electron gun is increased to enable further size reduction, then the resolution and dimensional control are improved, but the sensitivity of the resist film is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the resist film by incorporating specific polymers with controlled glass transition temperatures and acid diffusion characteristics. This allows the resist to maintain high sensitivity even when exposed to high-energy electrons, resolving the contradiction between resolution improvement and sensitivity loss.
Solution Approach 2:
The patent uses composite resist formulations combining multiple polymer components including polyhydroxystyrene and other polymers with specific functional groups. This composite structure provides both the sensitivity needed for high-voltage electron beam exposure and the structural integrity for precise pattern formation.
2Manufacturing precision
If the resist film thickness is reduced to facilitate pattern feature reduction and prevent collapse, then the resolution is improved, but the dry etch resistance must be improved
Solution Approach 1:
The patent modifies the local chemical properties of the resist film by incorporating specific functional groups and polymer structures that provide enhanced etch resistance in the regions subjected to plasma etching, while maintaining overall film thinness for high resolution patterning.
Solution Approach 2:
The patent adjusts the chemical composition parameters of the resist to achieve optimal balance between thickness and etch resistance. Specific polymer selections and cross-linking mechanisms provide the necessary structural strength in thin films without compromising resolution.
3Ease of manufacture
If conventional developers are used to develop the resist, then the development process is simple, but pattern collapse or bridge defects occur between pattern features
Solution Approach 1:
The patent introduces a specifically formulated developer solution that acts as an intermediary between the exposed resist and the development process. This developer contains controlled amounts of basic compounds that selectively dissolve exposed regions without causing pattern collapse or bridge defects, maintaining both process simplicity and pattern integrity.
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 use of the guanidine-based developer effectively suppresses pattern collapse and bridge defects, enhancing resolution and edge roughness while maintaining high sensitivity, thereby improving the accuracy and reliability of microelectronic pattern formation.
Implementation Method 1
a developer which is used in developing an exposed resist coating to form a resist pattern... comprising a polymer adapted to accelerate alkaline dissolution under the action of acid
Data Source
AI summary
An aqueous solution containing 0.1-10 wt % of a guanidine is a useful developer for photosensitive resist materials. A resist pattern is formed by applying a chemically amplified positive resist composition onto a substrate to form a coating, baking, exposing the coating to high-energy radiation, and developing the exposed coating in a guanidine-containing aqueous solution.