Semiconductor Production Control via Process Deviation Sensitivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional semiconductor device production methods struggle to accurately control the production process, leading to reduced quality and increased costs due to the inability to effectively manage process variations and their impact on device performance, resulting in defective products and low yields.
Innovation Solution
A semiconductor device production control method that monitors process results, quantifies the influence of deviations on device operation, and compares these deviations to predetermined allowable margins, allowing for real-time adjustments and improved yield control by predicting the degree of influence of process variations on device properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photolithography machines are used with lower resolution, then manufacturing cost is reduced, but manufacturing precision deteriorates due to inability to form fine patterns exactly as specified
Solution Approach 1:
The patent performs preliminary actions by calculating sensitivity information and determining process specifications before actual production. The system pre-determines which process parameters need control based on their sensitivity to device properties, and sets appropriate specifications in advance to guide the production process, thereby achieving high precision without requiring excessively complex equipment.
Solution Approach 2:
The patent changes the approach from controlling all process parameters uniformly to selectively controlling only those parameters that have high sensitivity to device properties. By identifying and focusing on critical parameters (such as exposure amount, focus position, etching conditions), the system achieves high manufacturing precision while avoiding the complexity of controlling every parameter at maximum precision.
2Manufacturing precision
If dimensional specifications are set simply as ±10% of target values, then ease of manufacture is improved, but manufacturing precision deteriorates because specifications are not related to actual device operation requirements
Solution Approach 1:
The patent transforms the specification setting approach by changing from fixed dimensional tolerances (±10%) to functional specifications based on device operation requirements. The system calculates process specifications that directly relate to maintaining acceptable device properties (timing, leakage current, etc.), thereby achieving high manufacturing precision without significantly increasing complexity.
Solution Approach 2:
The patent introduces sensitivity information as an intermediary that connects process parameters to device properties. This sensitivity data acts as a mediator that translates operational requirements into appropriate process specifications, enabling precise control without requiring complex direct measurement and adjustment systems.
3Reliability
If confirmatory tests are conducted after all production processes, then measurement precision is improved for detecting defects, but productivity deteriorates due to increased reprocessing and lower yields
Solution Approach 1:
The patent performs preliminary defect detection by monitoring process parameters and comparing them against calculated specifications during production. By identifying potential defects early in the process rather than after completion, the system can take corrective actions before defects manifest, thereby maintaining high reliability while improving productivity through reduced reprocessing.
Solution Approach 2:
The patent implements continuous feedback by monitoring process parameters during production and comparing them to predetermined specifications. This real-time feedback enables early detection of deviations that could lead to defects, allowing corrective actions to be taken promptly. The system uses sensitivity information to focus monitoring on critical parameters, maintaining high defect detection accuracy while minimizing productivity impact.
4Manufacturing precision
If timing allowance is added to design to account for process variations, then reliability is improved, but manufacturing precision deteriorates due to increased timing errors and reduced packing density
Solution Approach 1:
The patent changes the approach from adding timing allowance to achieving tight timing control through selective process parameter control. By identifying and controlling the specific process parameters that most affect timing (using sensitivity analysis), the system achieves high timing precision without requiring excessive design margins, thereby improving both manufacturing precision and reliability simultaneously.
Data Source
AI summary
A semiconductor device production control method includes monitoring, after a production process of a semiconductor device, a process result at a predetermined position of a pattern to which the process is applied, to obtain a deviation with respect to a predetermined target result, quantitatively obtaining a degree of influence on an operation of a semiconductor device from the deviation of the process result, and comparing the degree of influence that is quantitatively obtained with a predetermined allowable margin for operation specifications of the semiconductor device.