Laser Beam Shaping for Uniform Substrate Heating in Etching
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Solution Overview
Problem
Existing substrate heating units struggle to maintain uniform temperature across substrates during high-temperature etching processes, leading to variations in etching rates and defective substrates due to non-uniform heating.
Innovation Solution
A substrate heating unit that employs a laser generator and a beam shaper with movable lens arrays to reshape the laser beam into a uniform or edge-enhanced energy distribution, ensuring consistent heating across the substrate, with a temperature detector and controller adjusting the beam shaper to maintain optimal temperature uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high temperature processing liquid is supplied to the center of the substrate to heat it, then the etching rate is improved, but the temperature distribution becomes non-uniform with the center being hotter than the edges
Solution Approach 1:
The substrate surface is divided into multiple regions (center and edge zones) with different heating requirements. The heating system is segmented into multiple independent heating zones that can be controlled separately, allowing different temperature profiles for different regions to achieve overall uniform temperature distribution
Solution Approach 2:
Different regions of the substrate are provided with different heating intensities according to their specific requirements. The center region receives less heating while the edge regions receive more heating, creating a non-uniform heating strategy that results in uniform temperature distribution across the entire substrate
2Temperature
If a conventional substrate heating unit is used, then the substrate can be heated to required temperature, but the entire substrate cannot be maintained at a uniform temperature
Solution Approach 1:
The heating system transitions from a static, uniform heating approach to a dynamic, adjustable heating system. Multiple heating zones can independently adjust their heating intensity in real-time based on feedback from temperature sensors, enabling continuous optimization of temperature uniformity across the substrate
Solution Approach 2:
Temperature sensors are distributed across different regions of the substrate to monitor temperature distribution in real-time. This temperature information is fed back to the control system, which automatically adjusts the heating power of each heating zone to maintain uniform temperature, forming a closed-loop control system
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 achieves uniform substrate heating, minimizing temperature deviations and enhancing etching consistency, thereby reducing the occurrence of defective substrates.
Implementation Method 1
a laser generator configured to generate a first laser beam which is directed toward a substrate
Implementation Method 2
reshape an energy distribution of the first laser beam received from the laser generator to selectively provide the substrate with a second laser beam having one of a uniform energy distribution
Data Source
AI summary
Proposed is a substrate heating unit including: a laser generator providing a laser beam for heating a substrate; and a beam shaper processing the laser beam from the laser generator and selectively providing one of a first beam having a uniform energy distribution and a second beam having an edge-enhanced energy distribution to the substrate.