Plasma Ignition Validation Using Power Sensing in Wafer Processing
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Solution Overview
Problem
In plasma-enhanced semiconductor processing, frequent plasma ignition failures due to advancing technology make it difficult to maintain consistent plasma power, affecting the quality of deposited films and layers, as existing methods struggle to accurately monitor and control plasma ignition, especially with shorter pulse durations.
Innovation Solution
An apparatus and method that utilize a plasma control board with a power measurement sensor to count plasma pulses within predetermined threshold ranges, setting off alarms and adjusting parameters if the counts fall outside acceptable limits, ensuring consistent plasma ignition and maintaining wafer quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If plasma pulse duration time is shortened due to technological advance, then processing speed and productivity are improved, but plasma ignition detection becomes more difficult and ignition failure increases
Solution Approach 1:
The patent replaces traditional optical detection methods with an electrical measurement system. A power measurement sensor is integrated into the plasma generator to directly measure plasma power through electrical parameters, enabling accurate detection of short-duration plasma pulses that optical methods miss.
Solution Approach 2:
The system implements real-time feedback by continuously monitoring plasma power through the power measurement sensor and comparing it against threshold values. The controller receives this feedback and can detect ignition status, count good ignitions, and trigger alarms or adjust parameters based on the measured plasma power feedback.
2Device complexity
If plasma ignition monitoring is not implemented, then device complexity is reduced, but manufacturing precision and product quality deteriorate due to frequent ignition failures
Solution Approach 1:
The plasma generator incorporates a power measurement sensor directly into its structure, enabling the system to self-monitor its own plasma ignition status without requiring external complex monitoring equipment. The system serves itself by using its own power measurement capability for quality control.
Solution Approach 2:
The power measurement sensor serves multiple functions: it measures plasma power for detection, provides data for counting good ignitions, enables quality control through threshold comparison, and supports process optimization. This multi-functionality reduces the need for separate monitoring systems.
3Ease of manufacture
If traditional PLC logger is used for monitoring plasma ignition, then implementation is simple, but detection accuracy decreases with shorter plasma pulse durations
Solution Approach 1:
The patent replaces optical-based detection systems with electrical measurement systems. By measuring plasma power electrically through a power measurement sensor integrated in the plasma generator, the system achieves accurate detection of short-duration plasma pulses that optical methods cannot reliably detect.
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 effectively monitors and adjusts plasma parameters to prevent process failures, ensuring consistent plasma ignition and maintaining wafer quality by accurately counting good plasma pulses and adjusting settings accordingly, even with shorter pulse durations.
Implementation Method 1
The plasma control board may comprise a plasma power measurement sensor
Implementation Method 2
a plasma generator provided to the reactor chamber to generate a plasma in the chamber
Data Source
AI summary
An apparatus for semiconductor processing may be provided. The apparatus may comprise a reactor chamber configured to process a wafer, a plasma generator to generate a plasma in the reactor chamber, a plasma control board provided with a power control to control the plasma power in the reactor chamber, and a process controller operably connected to the plasma control board and configured to set plasma parameters for the plasma in the reactor chamber. The plasma control board may comprise a plasma power measurement sensor and may be constructed and/or programmed to count both the number of plasma pulses.