Electron Beam Piping Defect Detection in Semiconductor Contact Plugs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for detecting piping defects in semiconductor fabrication are incomplete and time-consuming, leading to delayed detection of malfunctioning electrical elements and increased costs due to long treatment and detection times, especially in the context of reduced process sizes and increased integration.
Innovation Solution
The method involves illuminating semiconductor contact plugs with an electron beam to detect piping defects by analyzing the brightness contrast between the plugs, allowing for non-destructive, online monitoring and real-time defect classification using scanning electron microscopy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional sampling inspection methods are used for piping defect detection, then detection costs are reduced, but detection completeness deteriorates
Solution Approach 1:
The inspection system utilizes the existing polysilicon layer structure and electron beam resources already present in the fabrication process. The polysilicon layer itself serves as the inspection target, and the electron beam from existing equipment performs the detection function, eliminating the need for separate inspection equipment and processes.
Solution Approach 2:
The electron beam inspection system serves multiple functions: it inspects piping defects in the polysilicon layer while also potentially serving other fabrication monitoring purposes. The same electron beam equipment can be used for different inspection stages, maximizing resource utilization and reducing overall inspection costs.
2Reliability
If rapid heat treatment is applied to reduce voids in the dielectric layer, then void formation is reduced, but piping defects still occur and detection time increases
Solution Approach 1:
The inspection is performed on the polysilicon layer before subsequent fabrication steps that would make defect detection more difficult or impossible. By inspecting early in the process when the polysilicon layer is still accessible and has characteristic brightness properties, defects are detected before they are buried or modified by later processing steps.
Solution Approach 2:
The inspection method exploits the brightness contrast between the polysilicon layer and the underlying dielectric layer. Piping defects appear as brightness variations in the electron beam image, allowing non-destructive detection based on optical/visual property differences rather than requiring physical sectioning or additional processing.
3Measurement precision
If online monitoring with complete detection is implemented, then detection accuracy is improved, but inspection time increases
Solution Approach 1:
The method replaces complex mechanical sectioning and laboratory analysis with electron beam-based optical inspection. The electron beam provides high-resolution imaging that can detect subtle brightness variations indicating piping defects, achieving high detection accuracy through electromagnetic field interactions rather than mechanical physical sectioning.
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 complete and efficient detection of piping defects, reducing inspection time and costs while improving yield and reliability in semiconductor fabrication.
Implementation Method 1
The first contact plug and the second contact plug are illuminated by electron beam
Implementation Method 2
accumulating charges on the second contact plug
Implementation Method 3
detecting piping defects according to brightness contrast between the polysilicon layer and the silicon oxide layer
Data Source
AI summary
A method of piping defect detection is provided. A semiconductor substrate having an active region and an isolation region is provided, a plurality of semiconductor elements are formed on the semiconductor substrate, a dielectric layer is deposited on the semiconductor substrate and the semiconductor elements, and first and second contact plugs are formed in the dielectric layer to connect the active region and the isolation region respectively. The first contact plug and the second contact plug are illuminated by an electron beam, accumulating charge on the second contact plug, and piping defects are detected between the first contact plug and the second contact plug according to brightness contrast between the first contact plug and the second contact plug.