MEMS Image Forming Element With On-Chip Voltage Generation
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Solution Overview
Problem
Current multi-beam scanning electron microscope (SEM) systems are limited in scalability due to the density of interconnecting wires and high voltage requirements for MEMS devices, which restricts the increase in the number of electron beamlets, affecting inspection accuracy and throughput.
Innovation Solution
A semiconductor chip design with integrated local voltage generators within the image forming elements, reducing the need for long interconnecting wires and allowing for higher MEMS device density, and using a primary and secondary voltage configuration to manage voltage requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of electron beamlets is increased to improve inspection throughput, then productivity increases, but the density of interconnecting wires becomes too high making the system infeasible
Solution Approach 1:
The patent divides the voltage generation function into multiple independent voltage generators distributed across the semiconductor chip. Each voltage generator serves a specific region or group of MEMS devices, eliminating the need for a single complex centralized voltage distribution system and reducing overall interconnecting wire density.
Solution Approach 2:
The patent transitions from external voltage generation to integrated on-chip voltage generation, adding a new dimensional aspect to the system architecture. By embedding voltage generators within the chip substrate rather than using external power supplies, the system achieves three-dimensional integration that reduces wire density in the traditional two-dimensional plane.
2Measurement precision
If the number of MEMS devices is increased to manipulate more electron beamlets, then inspection accuracy and throughput improve, but the requirement for long interconnecting wires makes the system infeasible
Solution Approach 1:
The patent extracts the voltage generation function from external power supplies and embeds it directly within the semiconductor chip. This extraction eliminates the need for long external interconnecting wires that would otherwise be required to supply voltage to numerous MEMS devices distributed across the chip.
Solution Approach 2:
Each region of the semiconductor chip becomes self-sufficient with its own integrated voltage generators, eliminating dependence on external power distribution infrastructure. The MEMS devices receive voltage locally from on-chip generators rather than relying on long external wire connections.
3Ease of manufacture
If external power supplies are used to provide voltage to MEMS devices, then the system is simpler to manufacture, but the need for long interconnecting wires reduces scalability
Solution Approach 1:
The patent merges the voltage generation function with the MEMS device array by integrating voltage generators directly into the semiconductor chip substrate. This combination creates a unified system where power distribution and device functionality are co-located, enabling scalable configurations without proportionally increasing interconnecting wire complexity.
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 design enhances the scalability of SEM systems by increasing the density of MEMS devices, improving inspection throughput and reliability, and simplifying installation and maintenance.
Implementation Method 1
Each of the MEMS devices is configured to generate an electric field to manipulate a beamlet of several electron beamlets in a multi-beam charged particle microscope
Implementation Method 2
Each of the voltage generators is configured to provide the voltage to the one or more MEMS devices through one of the electrical connections
Data Source
AI summary
The present disclosure describes an image forming element having a semiconductor chip with micro-electro-mechanical-system (MEMS) devices and voltage generators, each voltage generator being configured to generate a voltage used by one or more of the MEMS devices. A floating ground may be used to add a voltage to the voltage generated by the voltage generators. The semiconductor chip may include electrical connections, where each voltage generator is configured to provide the voltage to the one or more MEMS devices through the electrical connections. The MEMS devices may define a boundary in the semiconductor chip within which the MEMS devices, the voltage generators, and the electrical connections are located. Each MEMS device may generate an electrostatic field to manipulate an electron beamlet of a multi-beam charged particle microscope. The MEMS devices may be organized into groups based on a distance to a reference location (e.g., optical axis) in the semiconductor chip.