Modular Scanning Probe Array for In-Line Nanoscale Metrology
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Solution Overview
Problem
Current nanoscale metrology systems are inefficient for high-throughput, in-line measurement due to their bulkiness, limited scanning area, and inability to handle non-planar or flexible substrates, hindering the transition from small-scale fabrication to large-volume production of nanoscale materials and devices.
Innovation Solution
A compact system with independently controlled scanning tip probes, utilizing MEMS-based AFM technology and stacked nanopositioning, allows for precise measurement of large areas on non-uniform substrates, enabling in-line metrology during roll-to-roll manufacturing without contacting the sample, and accommodating moving substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional AFM systems are used for nanoscale measurement, then measurement precision is improved, but device complexity and bulkiness increase, making them unsuitable for high-throughput in-line measurement
Solution Approach 1:
The system divides the measurement function into multiple independent scanning probes arranged in arrays, where each probe can operate autonomously. This segmentation allows the complex measurement task to be distributed across multiple simpler units, reducing the complexity of each individual component while maintaining high measurement precision through parallel operation.
Solution Approach 2:
The patent replaces traditional bulky mechanical AFM systems with a more compact implementation using piezoelectric actuators for positioning and scanning. This substitution of mechanical components with piezoelectric technology significantly reduces system bulkiness while preserving nanoscale measurement precision, enabling in-line measurement applications.
2Measurement precision
If traditional AFM systems scan small areas with single probes, then measurement precision is maintained, but productivity decreases due to limited scanning area and slow scanning speed
Solution Approach 1:
The system employs arrays of multiple scanning probes that can operate in parallel to cover large substrate areas simultaneously. Each probe maintains nanoscale measurement precision while the collective array achieves high productivity by dividing the measurement task across multiple probes, enabling rapid scanning of entire substrates without sacrificing accuracy.
Solution Approach 2:
The patent combines multiple scanning probes into a single integrated measurement system that operates as a unified array. This merging of multiple probes allows simultaneous measurement of large areas while maintaining the precision of individual probes, significantly increasing measurement throughput for in-line production environments.
3Stability of the object's composition
If traditional AFM systems use fixed ground structures, then measurement stability is improved, but adaptability to non-planar and flexible substrates deteriorates
Solution Approach 1:
The system replaces fixed ground structures with dynamic, independently actuated scanning probes that can adapt their positions and orientations in real-time. Each probe in the array can be individually controlled to accommodate variations in substrate topology, maintaining measurement stability on non-planar and flexible substrates while achieving high adaptability to different substrate types.
Solution Approach 2:
The patent implements independent actuation of each scanning probe, allowing real-time adjustment of positioning parameters such as height, angle, and lateral position. This capability to change operational parameters dynamically enables the system to maintain measurement stability across substrates with varying topography and flexibility, from rigid to highly flexible materials.
4Device complexity
If multiple AFM tips are arranged in tight arrays with common ground structures, then device complexity is reduced, but adaptability to non-planar samples and scanning throughput deteriorate
Solution Approach 1:
The system segments the array structure into independently actuated probes without a common ground structure. Each probe operates autonomously with its own positioning and control system, simplifying the overall array structure by eliminating complex mechanical interconnections while enhancing adaptability to non-planar samples through independent probe adjustment.
Solution Approach 2:
The patent implements dynamic control of each probe in the array, allowing independent adjustment of position and orientation. This dynamic capability enables the simplified array structure to adapt to non-planar samples and flexible substrates, maintaining scanning throughput by allowing parallel operation of all probes without mechanical coupling constraints.
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 solution significantly increases measurement throughput and accuracy, enabling the scalable and cost-effective production of nanoscale devices by allowing for precise, non-destructive, and high-speed scanning of large areas on flexible substrates, overcoming the limitations of traditional AFM systems.
Implementation Method 1
a piezoelectric actuator to position the scanning probe tip in an x-direction parallel to a surface of the substrate
Implementation Method 2
a bimorph to position the scanning probe tip in a z-direction perpendicular to the surface of the substrate
Implementation Method 3
systems, methods and apparatus for the individual control and actuation of each individual scanning tip probe
Data Source
AI summary
Disclosed herein are devices, systems and methods for in-line, nanoscale metrology. One system comprises monolithic flexure mechanisms with integrated actuators that allow movement and positioning in two axes, with an extremely high degree of accuracy, of a structure comprising one or more scanning probes. This structure is suspended to prevent any destructive interference from a sample, which can be stationary or moving at a nonzero rate, and rigid or flexible in mechanical behavior. This system can be activated at startup and quickly actuate the structure to approach the surface of the sample. Once the system achieves the desired proximity between the one or more probes and the sample, the system maintains that position of the structure to a high degree of accuracy regardless of any disturbances. This array can be moved at varying speeds laterally to match the velocity of any continually moving substrates, thus enabling scanning of moving substrates.