Pulsed Electron Beam Inspection for Buried Semiconductor Defects
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Solution Overview
Problem
Current inspection techniques, such as optical inspection and X-ray inspection, struggle to detect small defects in semiconductor structures, particularly those buried within multiple layers or at the nanoscale, due to limitations in spatial resolution and depth penetration.
Innovation Solution
The use of scanning electron microscopy (SEM) or electron beam inspection (EBI) techniques, which employ a focused electron beam to inspect semiconductor samples with high spatial resolution, enabling the detection of sub-micron defects and those within internal layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical inspection or X-ray inspection is used, then the inspection process is simple and fast, but the spatial resolution is insufficient to detect small defects
Solution Approach 1:
The patent replaces optical inspection methods with electron beam inspection. The electron beam interacts with the semiconductor structure to generate signals that provide high-resolution imaging capability, enabling detection of sub-micron defects that optical methods cannot detect. This substitution of the inspection mechanism fundamentally resolves the spatial resolution limitation.
Solution Approach 2:
The patent changes the inspection parameter from optical wavelengths to electron beam parameters. By adjusting electron beam energy and detection parameters, the system achieves nanoscale resolution. The electron beam's de Broglie wavelength at typical inspection energies is on the order of picometers, providing theoretical resolution far beyond optical limits.
2Measurement precision
If optical inspection is used, then the inspection process is fast, but the depth penetration is insufficient to detect buried defects
Solution Approach 1:
The patent replaces optical inspection with electron beam inspection, which provides superior depth penetration. The electron beam can probe through multiple semiconductor layers and detect buried defects by analyzing backscattered electrons and other signals. This mechanism enables three-dimensional defect detection within the semiconductor structure without requiring time-consuming cross-sectioning.
3Measurement precision
If electron beam inspection is used to achieve high spatial resolution, then small defects can be detected, but the inspection process becomes more complex
Solution Approach 1:
The patent implements a multi-functional electron beam inspection system that performs multiple detection tasks simultaneously. The same electron beam setup detects various defect types (open defects, non-open defects, material variations) and provides both imaging and electrical characterization. This multi-functionality reduces the need for multiple separate inspection tools and procedures.
Solution Approach 2:
The inspection system automatically analyzes the complex electron beam signals to identify and classify defects. The system self-calibrates and processes the high-dimensional data without requiring manual intervention, transforming the complexity of signal processing into automated defect detection and classification capabilities.
4Productivity
If conventional inspection methods are used, then the manufacturing process remains simple, but yield is reduced due to undetected small defects
Solution Approach 1:
The patent replaces conventional optical inspection with electron beam inspection to achieve the detection precision necessary for high-yield manufacturing. The electron beam's superior resolution enables detection of sub-micron defects that would otherwise escape detection and cause device failures, directly improving manufacturing yield.
Solution Approach 2:
The inspection method uses a focused electron beam that can be rapidly repositioned and reused across multiple inspection locations. The beam itself is a temporary, disposable probe that can inspect thousands of devices without degradation, providing high detection precision at low per-unit cost.
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
EBI provides high-resolution imaging and defect detection capabilities, effectively identifying both open and non-open defects in semiconductor structures, thereby improving yield and ensuring the quality and reliability of semiconductor products.
Implementation Method 1
performing an electron beam inspection operation on the plurality of conductive structures of the semiconductor structure to obtain an inspection data, wherein a pulsed electron beam utilized in the electron beam inspection operation
Data Source
AI summary
A method for detecting defects in a semiconductor structure is provided. The method includes the following operations. A semiconductor structure having a plurality of conductive structures is received. An electron beam inspection operation is performed on the plurality of conductive structures of the semiconductor structure to obtain an inspection data, wherein a pulsed electron beam utilized in the electron beam inspection operation is selected from the group consisting of a nanosecond pulsed beam, a picosecond pulsed beam, and a femtosecond pulsed beam. A first conductive structure having a non-open defect is identified from the inspection data. A method for classifying semiconductor structure is also provided.