Photoresist Coating Composition for Fine Pattern Formation
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Solution Overview
Problem
Current methods for forming fine patterns in semiconductor manufacturing, such as RFP, RELACS, and SAFIER, face challenges like overflowing phenomena due to heat sensitivity and residual issues, leading to increased costs and complexity, and limitations in pattern size reduction.
Innovation Solution
A photoresist coating composition comprising a water-soluble polymer and an aqueous solvent, which forms a cross-linkage with the photoresist material to create a uniform coating film, reducing pattern size without using expensive materials or complex processes, and includes additives like alcohol compounds or surfactants to enhance solubility and coating characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thermal energy is applied at above glass transition temperature to reduce pattern size, then pattern size is reduced, but overflowing phenomenon occurs making upper portion wider than lower portion
Solution Approach 1:
A water-soluble polymer coating layer is applied as an intermediary between the photoresist pattern and the thermal energy source. This coating layer acts as a mediator that moderates the thermal flow, preventing direct excessive heating of the photoresist while still enabling pattern size reduction through controlled thermal energy transfer.
Solution Approach 2:
The invention changes the thermal parameters by applying thermal energy at a lower temperature (below the glass transition temperature of the photoresist) compared to conventional methods. This parameter change prevents the photoresist from becoming too fluid and overflowing, while the water-soluble polymer coating enables sufficient thermal energy transfer to achieve pattern size reduction.
2Manufacturing precision
If baking time is extended or temperature is increased to reduce pattern size, then pattern size reduction is enhanced, but overflowing phenomenon becomes more frequent
Solution Approach 1:
The water-soluble polymer coating serves as a protective intermediary that enables extended baking times and higher temperatures without causing photoresist overflow. It absorbs and distributes thermal energy uniformly, preventing localized overheating while maintaining process stability and reliability.
Solution Approach 2:
The water-soluble polymer coating is applied beforehand to cushion and protect the photoresist pattern during thermal processing. This pre-applied protective layer prevents direct thermal damage and overflow that would occur with extended baking or higher temperatures, allowing more aggressive size reduction parameters to be used safely.
3Manufacturing precision
If RELACS material or SAFIER material is used to reduce pattern size, then pattern size is reduced, but residuals remain in pattern affecting subsequent etching processes
Solution Approach 1:
The water-soluble polymer coating is designed as a temporary, disposable protective layer that performs its function during thermal processing and then completely dissolves away in water, leaving no harmful residuals. This contrasts with RELACS and SAFIER materials that leave persistent contaminants.
Solution Approach 2:
The water-soluble polymer coating is deliberately discarded through simple water washing after the thermal processing is complete. This discarding process completely removes the coating material without leaving residuals, unlike RELACS and SAFIER materials that require complex removal processes and still leave contaminants.
4Manufacturing precision
If RELACS material or SAFIER material coating process is added, then pattern size reduction is achieved, but process complexity and cost increase
Solution Approach 1:
The invention merges the pattern size reduction function with a simple water-washable coating process, combining multiple functions (protection, thermal energy transfer, and easy removal) into a single integrated approach that eliminates the need for separate complex material coating and removal steps required by RELACS and SAFIER methods.
Solution Approach 2:
The water-soluble polymer coating replaces expensive, complex materials like RELACS and SAFIER with a simple, inexpensive, water-soluble alternative that requires no special handling, storage, or removal infrastructure, thereby simplifying the overall process and reducing costs.
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 solution effectively reduces pattern size by 10-30% while maintaining etching resistance and avoiding damage to underlying layers, simplifying the process and reducing defects, thus improving yield and reliability.
Implementation Method 1
a water-soluble polymer and an aqueous solvent which reacts with a photoresist material to form a coating film on its surface
Implementation Method 2
thermal energy is applied at above a glass transition temperature of the photoresist, so that the photoresist may flow thermally. The previously formed pattern has been gradually reduced by the supplied heat energy
Data Source
AI summary
A photoresist coating composition that includes a compound represented by Formula 1 and an aqueous solvent, and a method for forming a fine pattern by coating the composition on a photoresist pattern to effectively reduce a size of a photoresist contact hole and a space, which can be applied to all semiconductor processes.