Wafer Chuck Vacuum Flow Control for Uniform Heating
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Solution Overview
Problem
Current wafer processing technologies face challenges in achieving uniform temperature control and vacuum pressure adjustment during semiconductor manufacturing, which affects the warpage of wafers and overall process yield.
Innovation Solution
A wafer processing apparatus with a heating plate, vacuum ports, support pins, and a flow regulator system that includes a chuck controller to adjust the flow rate of a fluid to maintain constant vacuum pressure and control temperature uniformity, using sensors to monitor and adjust the separation distance and pressure for precise wafer fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vacuum pressure is increased to fix the wafer firmly to the plate, then wafer fixation reliability is improved, but wafer warpage increases due to excessive pressure on the wafer surface
Solution Approach 1:
The vacuum pressure application is segmented into two distinct zones: a first vacuum pressure applied to the first surface of the wafer for fixation, and a second vacuum pressure applied to the second surface for warpage control. This segmentation allows independent optimization of fixation strength and warpage prevention without compromising either objective.
Solution Approach 2:
Different vacuum pressure levels are applied to different surfaces of the wafer based on their specific requirements. The first surface receives higher vacuum pressure for secure fixation, while the second surface receives lower vacuum pressure to prevent excessive warpage, achieving local optimization of pressure distribution.
2Productivity
If heating power is increased to achieve target temperature faster, then heating efficiency is improved, but temperature uniformity across the wafer deteriorates
Solution Approach 1:
The heating system dynamically adjusts power distribution based on real-time temperature feedback from multiple sensors across the wafer surface. The controller modifies heating power to each zone dynamically, maintaining high overall heating efficiency while ensuring temperature uniformity across different regions of the wafer.
Solution Approach 2:
Different heating zones on the plate are provided with locally optimized heating power based on their specific thermal requirements and distance from the wafer center. This local quality approach ensures that each region contributes to achieving the target temperature uniformly across the entire wafer surface.
3Reliability
If vacuum flow rate is increased to improve wafer fixation, then fixation strength is improved, but temperature uniformity deteriorates due to fluid flow interference
Solution Approach 1:
The vacuum flow control is segmented into two independent channels: one controlling vacuum flow to the first surface for fixation, and another controlling vacuum flow to the second surface. This segmentation allows the system to maintain adequate fixation strength while minimizing excessive fluid flow that would interfere with thermal uniformity.
Solution Approach 2:
The system changes the vacuum flow rate parameter dynamically during the heating process. Initially, higher vacuum flow is applied to ensure proper wafer fixation, then the flow rate is adjusted downward as heating progresses to eliminate interference with temperature uniformity while maintaining sufficient fixation.
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 apparatus ensures uniform heating and fixation of wafers, reducing warpage and enhancing manufacturing yield by maintaining consistent vacuum pressure and temperature, thereby improving the precision of semiconductor processing.
Implementation Method 1
a heater configured to heat the plate
Implementation Method 2
a plurality of vacuum ports positioned between the plurality of support pins
Implementation Method 3
providing a vacuum pressure for adhesion of the wafer to the plurality of vacuum ports
Data Source
AI summary
Provided is a wafer processing apparatus including a plate having a plurality of support pins configured such that a wafer is mounted on the plurality of support pins and a plurality of vacuum ports positioned between the plurality of support pins, a heater configured to heat the plate, a flow regulator configured to provide a vacuum pressure for fixing the wafer to the plurality of vacuum ports, and configured to adjust a flow rate of a fluid flowing into the plurality of vacuum ports to be a target flow rate, and a chuck controller configured to control the target flow of the fluid set in the flow regulator, wherein the chuck controller is configured to generate a flow control signal for reducing the target flow rate of the fluid and send the flow control signal to the flow regulator during a heating process of the wafer.