Electrostatic Chuck Gas Flow Measurement for Wafer Warpage Detection
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Solution Overview
Problem
Semiconductor manufacturing apparatuses face challenges in detecting and addressing wafer warpage, which can lead to conveyance issues during processing, as existing methods lack effective means to differentiate between convex and concave warpage states, necessitating unnecessary equipment inspection and downtime.
Innovation Solution
The semiconductor manufacturing apparatus incorporates an electrostatic chuck stage with dual gas introduction grooves and measurement instruments to monitor gas flow rate and pressure, allowing for the determination of wafer warpage states by analyzing the differences in gas flow and pressure between these grooves, enabling real-time detection and differentiation between convex and concave warpage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single gas supply method is used, then the device structure is simple, but it cannot detect wafer warpage states
Solution Approach 1:
The gas supply system is segmented into multiple independent gas supply grooves (first gas supply groove and second gas supply groove) positioned at different locations on the chucking surface. Each groove has its own gas supply path and measurement instruments, allowing independent measurement of gas flow and pressure at different locations to detect wafer warpage
Solution Approach 2:
Gas flow and pressure measurements serve as intermediary parameters to indirectly detect wafer warpage states. By measuring the physical state of gas at different supply locations and comparing these measurements, the system can infer the presence and type of wafer warpage without direct physical contact with the wafer surface
2Productivity
If wafer warpage is not detected, then processing continues without interruption, but conveyance issues occur
Solution Approach 1:
The system performs preliminary detection of wafer warpage by measuring gas flow and pressure at multiple supply locations before conveyance issues occur. The control unit analyzes these measurements to identify convex or concave warpage states in advance, allowing preventive actions to be taken before the wafer causes conveyance problems during processing
Solution Approach 2:
The system establishes a feedback loop where gas flow and pressure measurements are continuously monitored and fed back to the control unit. Based on this feedback, the system can identify warpage conditions and trigger appropriate responses (such as stopping processing or adjusting parameters) to maintain reliable wafer conveyance while minimizing processing interruptions
3Measurement precision
If equipment inspection is performed for all warpage cases, then warpage is detected, but unnecessary downtime occurs
Solution Approach 1:
Instead of assuming all warpage cases require equipment inspection, the system inverts the approach by using gas flow and pressure measurements to differentiate between wafer-related warpage and equipment-related issues. By analyzing the pattern of measurements across multiple gas supply grooves, the system can identify whether the warpage is due to wafer characteristics or equipment problems, allowing selective inspection only when equipment defects are suspected
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 solution allows for immediate identification of wafer warpage, enabling the apparatus to temporarily stop processing, dechuck the wafer, and redirect it for inspection, thereby improving productivity by distinguishing equipment defects from wafer-related issues, reducing unnecessary downtime and enhancing processing efficiency.
Implementation Method 1
an electrostatic chuck stage configured to hold a wafer
Data Source
AI summary
A semiconductor manufacturing apparatus includes an electrostatic chuck stage for configured to hold a wafer and supplying gas from a gas supply source to the wafer. The electrostatic chuck stage includes a first opening that supplies the gas to a first portion located at a first distance from the center of the wafer, and a second opening that supplies the gas to a second portion located at a second distance from the center of the wafer. The second distance being greater than the first distance. A first measurement instrument configured to measure a physical quantity of the gas between the gas supply source and the first opening, and a second measurement instrument configured to measure a physical quantity of the gas between the gas supply source and the second opening. An output device outputs information on the wafer based on the physical quantities measured by the first and second measurement instruments.