Developer Nozzle Layout for Central Photoresist Residue Removal
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Solution Overview
Problem
High viscosity photoresist materials result in uneven layers and residue on substrates during development, interfering with subsequent etching operations and ion implantation due to resistance to flow and incomplete removal.
Innovation Solution
A developer tool with a dispenser having a greater quantity of nozzles in the central portion compared to the perimeter portion, allowing for more effective removal of photoresist material from the substrate center, reducing residue and enhancing semiconductor processing yield and quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high viscosity photoresist material is used, then photoresist layer thickness can be maintained, but uneven distribution and residue occur on substrate
Solution Approach 1:
The dispenser is configured with varying nozzle densities across different regions: a first plurality of nozzles in a central region and a second plurality of nozzles in a peripheral region, where the nozzle density in the central region is higher than in the peripheral region. This local differentiation compensates for the non-uniform flow characteristics of high viscosity photoresist material, ensuring uniform thickness distribution across the substrate while preventing residue formation in the central area.
2Ease of manufacture
If high viscosity photoresist material is used, then photoresist layer can be formed, but incomplete removal occurs during development
Solution Approach 1:
The dispenser employs region-specific nozzle arrangements with higher density in the central region where photoresist accumulation is most problematic. This localized enhancement ensures thorough removal of high viscosity photoresist material from the central substrate area, achieving complete removal reliability while maintaining ease of manufacture through the spin-coating process.
3Device complexity
If uniform nozzle distribution is used, then device simplicity is maintained, but central substrate coverage is insufficient
Solution Approach 1:
Rather than using a uniform nozzle distribution, the dispenser is designed with non-uniform nozzle density: a first plurality of nozzles in the central region with higher density and a second plurality of nozzles in the peripheral region with lower density. This local quality differentiation improves central substrate coverage and photoresist thickness uniformity while maintaining reasonable device complexity through a systematic nozzle arrangement pattern.
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 tool effectively removes photoresist residue, preventing defects and improving semiconductor processing quality by compensating for the thickness variations in high viscosity photoresist layers, thereby increasing yield and quality.
Implementation Method 1
The developer tool may dispense the chemical developer agent onto a photoresist layer on a substrate
Implementation Method 2
the chemical developer agent may dissolve exposed or unexposed portions of the photoresist layer to expose the pattern
Data Source
AI summary
A developer tool described herein includes a dispenser that includes a greater quantity of nozzles in a central portion relative to a perimeter portion such that the developer tool is capable of more effectively removing material from a photoresist layer near a center of a substrate (which tends to be thicker near the center of the substrate relative to the edge or perimeter of the substrate). In this way, the developer tool may reduce the amount of photoresist residue or scum remaining on the substrate near the center of the substrate after a development operation, which may enable defect removal and/or prevention, may increase semiconductor processing yield, and/or may increase semiconductor processing quality.