Semiconductor Sample Inspection via Conductive Layer Mediation
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Solution Overview
Problem
Current semiconductor inspection methods face challenges with electron-microscope image distortion due to electromagnetic interference, particularly at low electron beam energies, which affects the accuracy of cross-sectional analysis in scanning electron microscopy.
Innovation Solution
A method involving sandwiching a processed semiconductor sample between two blocks of semiconductor material, polishing to achieve an even surface, and measuring using multi-beam scanning electron microscopy to minimize field distortion and surface charge issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If low electron beam energy is used for SEM imaging, then surface charge issues are reduced, but field distortion increases causing image distortion
Solution Approach 1:
A conductive layer is introduced as an intermediary between the semiconductor sample and the electron beam. This conductive layer serves as a mediator that dissipates surface charges while maintaining a stable electric field environment, thus preventing both surface charge accumulation and field distortion without requiring low beam energy
Solution Approach 2:
The patent replaces the mechanical approach of reducing beam energy to minimize surface charging with an electrical solution - applying a conductive coating that actively manages charge distribution. This substitution allows maintaining higher beam energies for better signal strength while controlling surface charge effects through electrical conduction rather than mechanical energy reduction
2Measurement precision
If sophisticated hardware for EMI detection and compensation is used, then image distortion is reduced, but device complexity increases
Solution Approach 1:
The patent extracts and addresses the root cause of electromagnetic interference by applying a conductive layer directly to the sample surface, rather than using complex external EMI detection and compensation hardware. This simplifies the system by preventing EMI at the source rather than detecting and compensating for it afterward
Solution Approach 2:
The conductive layer serves as a simple, inexpensive preparation step that replaces costly and complex EMI compensation hardware. The coating is applied once during sample preparation and provides ongoing protection against field distortion throughout the imaging process, offering a cost-effective alternative to sophisticated electronic compensation systems
3Difficulty of detecting and measuring
If cross-sectional analysis is performed on semiconductor samples, then internal structures can be inspected, but surface potential effects cause beam deflection and distortion
Solution Approach 1:
The conductive layer acts as an intermediary that stabilizes the electric field environment between the electron beam and the semiconductor sample's internal structures. This mediator prevents surface potential effects from deflecting the beam while allowing the beam to penetrate and image internal structures through the cross-section
Solution Approach 2:
The patent changes the electrical parameters of the sample surface by applying a conductive coating, which fundamentally alters the electric field distribution at the sample surface. This parameter change eliminates beam deflection caused by surface potentials while maintaining the ability to image internal structures, solving the contradiction between inspecting internal structures and avoiding beam deflection
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 high-resolution imaging with minimal field distortion, allowing for accurate defect detection and analysis of semiconductor samples, especially at low landing energies, thereby improving the reliability of semiconductor inspection and analysis.
Implementation Method 1
scanning electron microscopy (SEM) methods
Data Source
AI summary
A method and device for inspection or analysis of a semiconductor sample is provided. The method includes: sandwiching a processed semiconductor sample between two blocks of a semiconductor material; polishing the sandwiched sample such that an even surface is obtained; and measuring the surface of the sandwiched sample. The blocks of a semiconductor material comprise the same semiconductor material as the semiconductor sample.