AFM Substrate Damage Measurement via Material Property Analysis
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Solution Overview
Problem
Current methods for measuring substrate damage caused by electron beams, especially in the semiconductor industry, are inadequate for detecting damage below the surface and are not sensitive enough to changes in material properties that do not manifest as surface topology changes.
Innovation Solution
The use of an atomic force microscope (AFM) to measure mechanical and chemical material properties at the exposure area of the electron beam, calculating a damage parameter based on these properties, which can include adhesive, viscoelastic, and subsurface properties, to quantify the extent of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electron beam energy is increased to penetrate deeper layers for inspection, then inspection capability is improved, but substrate damage increases
Solution Approach 1:
The patent applies preliminary action by measuring material properties (adhesiveness, friction, viscosity, elasticity) before and after electron beam exposure to detect damage early. The AFM-based measurement system characterizes the substrate's mechanical and chemical properties prior to inspection, then compares post-inspection measurements to identify damage caused by the electron beam, enabling preventive adjustments to inspection parameters.
2Ease of operation
If traditional topology measurement methods are used, then measurement simplicity is maintained, but detection sensitivity for subsurface damage is insufficient
Solution Approach 1:
The patent replaces traditional mechanical/topological measurement methods with an AFM-based system that measures mechanical and chemical material properties. Instead of relying on surface topology changes, the system uses AFM to quantify adhesiveness, friction, viscosity, and elasticity, which are more sensitive indicators of electron beam damage including subsurface damage. This substitution maintains operational simplicity while dramatically improving detection sensitivity.
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 method provides a more accurate and sensitive measurement of substrate damage, enabling detection of changes that are not visible at the surface, thus improving metrology and inspection in the semiconductor industry.
Implementation Method 1
using an atomic force microscope to provide a measurement of mechanical and/or chemical material properties of the substrate at an exposure area of the electron beam
Implementation Method 2
an electron beam interacts with a substrate... measuring any substrate damage that may be caused as a result of the electron beam interaction
Data Source
AI summary
A method for measuring damage (D) of a substrate (1) caused by an electron beam (2). The method comprises using an atomic force microscope (AFM) to provide a measurement (S2) of mechanical and/or chemical material properties (P2) of the substrate (1) at an exposure area (1a) of the electron beam (2). The method further comprises calculating a damage parameter (Sd) indicative for the damage (D) based on the measurement (S2) of the material properties (P2) at the exposure area (1a).