Ion Implantation Glitch Control via Power Supply Response
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Solution Overview
Problem
Ion implantation processes in solar cell manufacturing are hindered by glitches, which cause sudden degradation in beam quality due to voltage variations, leading to non-uniform doping and reduced efficiency, and current solutions like blanking the beam are time-consuming and impact throughput.
Innovation Solution
The ion implantation system is modified with faster response times, improved glitch detection, and elimination of voltage blanking, using redesigned power supplies with tighter thresholds and output filtering to minimize glitch duration and maintain dose uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage blanking is used to respond to glitches, then beam quality is protected, but implantation throughput is reduced due to time-consuming pauses
Solution Approach 1:
The system performs preliminary detection of voltage anomalies using multiple sensors (voltage sensors, current sensors, arc sensors) before complete beam degradation occurs. By detecting early signs of glitches and taking preventive action, the system avoids the need for complete beam blanking while still protecting beam quality, thus maintaining higher throughput.
Solution Approach 2:
The system implements real-time feedback monitoring of voltage, current, and arc conditions during ion implantation. When deviations from normal operating parameters are detected, the control system immediately adjusts power supply outputs to correct the anomaly, allowing continuous operation without throughput-penalty blanking pauses.
2Manufacturing precision
If faster voltage response is implemented to reduce glitch duration, then dose uniformity is improved, but power supply complexity increases
Solution Approach 1:
The power supply system is divided into multiple independent power supply units, each equipped with its own voltage sensor, current sensor, and control circuitry. This segmentation allows each unit to respond independently and rapidly to voltage anomalies without affecting the entire system, achieving fast response with manageable complexity through modular design.
Solution Approach 2:
The system introduces intermediary control circuits and sensors that mediate between the power supplies and the ion beam generation process. These intermediaries detect voltage deviations and translate them into corrected power supply outputs, enabling precise control of glitch duration without requiring direct complex control of the entire power 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
This approach reduces glitch duration to 20-40 milliseconds, ensuring dose uniformity within 2-3% and maintaining solar cell efficiency without pausing the implantation process, thus enhancing manufacturing throughput.
Implementation Method 1
A voltage glitch is detected by a power supply of the ion implanter
Implementation Method 2
A response to the voltage glitch is initiated by the power supply that minimizes the duration of the beam current glitch
Data Source
AI summary
An ion implantation system and method are disclosed in which glitches in voltage are minimized by modifications to the power system of the implanter. These power supply modifications include faster response time, output filtering, improved glitch detection and removal of voltage blanking. By minimizing glitches, it is possible to produce solar cells with acceptable dose uniformity without having to pause the scan each time a voltage glitch is detected. For example, by shortening the duration of a voltage to about 20-40 milliseconds, dose uniformity within about 3% can be maintained.