Scanning Probe Electrostatic Compensation
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Solution Overview
Problem
Scanning probe microscopes face challenges in accurately scanning samples with electrostatic charges, as existing methods that monitor and adjust for these charges can slow down the scanning process due to synchronization requirements.
Innovation Solution
A method and system where a scanning probe system applies a measurement voltage to determine a counteracting voltage value to nullify electrostatic forces, allowing for scanning with a bias voltage that reduces or eliminates electrostatic interactions, enabling faster scanning by determining this voltage value before the scanning process, which can be based on multiple measurement positions and varied across the sample surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrostatic charge state is monitored in synchronization with scanning, then measurement accuracy is improved, but scanning speed deteriorates
Solution Approach 1:
The patent applies preliminary action by measuring the counteracting voltage value at a measurement position before actual scanning begins. The system determines the voltage needed to nullify electrostatic forces in advance, stores this value, and then uses it during scanning without continuous monitoring. This allows accurate electrostatic compensation while maintaining high scanning speed, resolving the contradiction between measurement precision and productivity.
2Reliability
If continuous monitoring and adjustment of electrostatic charge is performed, then probe damage is prevented, but measurement time increases
Solution Approach 1:
The system performs preliminary measurement of the counteracting voltage value before scanning, preparing the compensation voltage in advance. During actual scanning, the pre-determined bias voltage is applied without continuous adjustment, preventing probe damage from electrostatic discharge while keeping the measurement process fast. This resolves the contradiction between reliability and measurement time.
Solution Approach 2:
The system uses the measurement position itself to determine the counteracting voltage value that will be used during scanning. By leveraging the electrostatic conditions at the measurement position, the system self-determines the appropriate compensation voltage without requiring continuous external monitoring or adjustment during scanning, thus protecting the probe while maintaining efficiency.
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 allows for quicker and more accurate scanning of samples with electrostatic charges by applying a predetermined bias voltage, reducing measurement errors and preventing probe-sample discharge, while maintaining scanning speed by determining the counteracting voltage value before scanning.
Implementation Method 1
moving the probe to a measurement position at which the sample imposes an electrostatic force on the probe
Implementation Method 2
applying a measurement voltage to the scanning probe system, varying the measurement voltage applied to the scanning probe system, and monitoring a reaction of the probe to the variation of the measurement voltage to measure a counteracting voltage value which reduces or nullifies the electrostatic force on the probe
Data Source
AI summary
A method of scanning a sample with a scanning probe system, the scanning probe system comprising a probe comprising a cantilever extending from a base to a free end, and a probe tip carried by the free end of the cantilever, the method comprising using the probe to measure an electrostatic interaction between the sample and the probe; and after measuring the electrostatic interaction between the sample and the probe, scanning the sample with the probe while simultaneously applying a bias voltage to the scanning probe system, the applied bias voltage based on the measured electrostatic interaction between the sample and the probe.