Annular UV Planarization Curing for Uniform Edge Exposure
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Solution Overview
Problem
Existing planarization systems face non-uniform UV light transmission due to geometric features in the superstrate chuck, leading to unsatisfactory curing performance, particularly at the edges, causing irregular substrate topography and affecting semiconductor fabrication processes.
Innovation Solution
A planarization system employing an annular light source positioned between the planarizing head and substrate chuck, which emits light only to the outer annular region of the multilayer structure, avoiding direct light emission to the inner central region, combined with an additional light source for uniform curing, mitigates non-uniformity issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UV light is transmitted through a transparent superstrate chuck for curing, then the formable material can be cured, but non-uniform transmission occurs due to geometric features causing intensity peaks and non-uniformity
Solution Approach 1:
The light source is segmented into an annular configuration that directs UV light only to the outer annular region of the substrate, separating the curing zones to avoid interference with the central region and achieve more uniform curing across different areas
Solution Approach 2:
A reflective layer is introduced as an intermediary component between the superstrate chuck and the substrate. This reflective layer redirects UV light that would otherwise be absorbed or scattered by the chuck's geometric features, improving light distribution uniformity and curing consistency
2Productivity
If high intensity UV light is used for curing, then curing speed improves, but high intensity peaks occur at sharp edges causing non-uniformity
Solution Approach 1:
The annular light source provides localized UV irradiation specifically to the outer annular region where it is needed, while the central region receives light through a different path or at a different intensity level, allowing optimized curing conditions for each zone without causing intensity peaks
Solution Approach 2:
The reflective layer converts potentially harmful direct UV exposure at sharp edges into beneficial redirected light that fills in uniformity gaps, transforming the geometric features that cause problems into opportunities for improved light distribution
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
This configuration ensures uniform curing of the formable material, preventing high intensity peaks and non-uniform transmission, thereby improving the planarization process and enhancing semiconductor device fabrication by maintaining substrate flatness and consistency.
Implementation Method 1
an annular light source disposed between an upper end of the planarizing head and the substrate chuck. The annular light source is configured to emit light onto an outer annular region of the multilayer structure
Implementation Method 2
A planarization technique sometimes referred to as inkjet-based adaptive planarization (IAP) involves dispensing a variable drop pattern of polymerizable material between the substrate and a superstrate
Implementation Method 3
high intensity peaks may occur at sharp edges of the superstrate chuck due to Fresnel diffraction at the edges of the geometric features
Data Source
AI summary
A planarization system comprises a substrate chuck configured to hold a substrate, a superstrate chuck configured to hold a superstrate, a planarizing head configured to support the superstrate chuck, a positioning system configured to cause the superstrate to come into contact with formable material dispensed on the substrate to form a multilayer structure, the multilayer structure including the superstrate, a film of the formable material, and the substrate, and an annular light source disposed between an upper end of the planarizing head and the substrate chuck. The annular light source is configured to emit light onto an outer annular region of the multilayer structure without emitting the light onto an inner central region of the multilayer structure. The inner central region is located radially inward relative to the outer annular region.