Hybrid Ion Implanter Discharge Detection System
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Solution Overview
Problem
In semiconductor manufacturing, accurately detecting discharge events during ion implantation is challenging, particularly when relying solely on Faraday cup measurements, which can lead to inconsistencies in ion beam stability and affect the performance of manufactured semiconductor products.
Innovation Solution
Implementing a hybrid scanning ion implanter with multiple detection units, including dose cups and power supply voltage measurement units, to detect potential discharge events and determine the ion beam state, allowing for precise control and adjustment of ion implantation conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only a Faraday cup is used to measure beam current, then the device complexity is low, but the measurement precision of discharge events is insufficient
Solution Approach 1:
The patent combines multiple detection units (Faraday cup, beam monitor, power supply voltage measurement units) into an integrated detection system. These units work together to comprehensively monitor beam current, detect discharge events, and measure power supply variations, thereby improving measurement precision without requiring a completely new complex system
Solution Approach 2:
The detection system is designed with multi-functional units that can perform various measurement tasks. The Faraday cup measures beam current, the beam monitor detects discharge events, and power supply voltage measurement units monitor electrical parameters. This multi-functionality allows accurate discharge event detection while avoiding the need for separate specialized devices for each measurement type
2Measurement precision
If multiple detection units are implemented, then the measurement precision of ion beam state is improved, but the device complexity increases
Solution Approach 1:
The detection system is segmented into multiple independent detection units, each responsible for specific measurement functions. This segmentation allows each unit to be optimized for its specific task while maintaining overall system manageability. The modular structure enables accurate ion beam state detection without creating an unmanageably complex monolithic system
Solution Approach 2:
The patent introduces a control unit that acts as an intermediary, coordinating the multiple detection units and processing their outputs. This intermediary component integrates information from various sensors and provides centralized control, thereby managing system complexity while enabling comprehensive ion beam state monitoring through multiple detection channels
3Manufacturing precision
If discharge events are not accurately detected, then the ease of operation is high, but the manufacturing precision of semiconductor products deteriorates
Solution Approach 1:
The detection units provide real-time feedback on discharge events and ion beam state to the control system. This feedback mechanism enables automatic detection and response to discharge events, ensuring manufacturing precision without requiring manual monitoring and intervention. The system self-regulates based on detected conditions, maintaining product consistency while reducing operational burden
Solution Approach 2:
The system performs preliminary detection of discharge events and ion beam state changes before they affect semiconductor product quality. By detecting potential issues in advance and enabling preventive actions, the system ensures manufacturing precision while simplifying operation through automated early warning and response mechanisms
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 enables accurate detection and management of discharge events, ensuring consistent ion beam stability and improving the productivity and performance of semiconductor products by allowing for real-time adjustments during the ion implantation process.
Implementation Method 1
an ion source, an extraction electrode, a mass analysis magnet device
Implementation Method 2
a function of generating an ion beam which is ionized by an ion source and then accelerated
Implementation Method 3
a mass analysis magnet device
Implementation Method 4
a process for implanting ions into a semiconductor wafer (hereinafter, referred to as an 'ion implantation process') is performed
Data Source
AI summary
Provided is an ion implantation method of transporting ions generated by an ion source to a wafer and implanting the ions into the wafer by irradiating an ion beam on the wafer, including, during the ion implantation into the wafer, using a plurality of detection units which can detect an event having a possibility of discharge and determining a state of the ion beam based on existence of detected event having a possibility of discharge and a degree of influence of the event on the ion beam.