Monolithic Charged-Particle Detector With Integrated Signal Processing
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Solution Overview
Problem
Existing charged particle detection systems face limitations in signal-to-noise ratio and system throughput, particularly at low beam currents, due to complex wiring and noise interference in analog signal paths, which hinder high-speed, high-bandwidth detection necessary for inspecting miniaturized semiconductor devices.
Innovation Solution
A monolithic detector system is developed, where sensing elements and signal processing components are integrated on opposite sides of a semiconductor substrate, with a thin insulating region in between, allowing for efficient carrier generation and signal processing without the need for complex interconnections, thereby reducing noise and increasing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a detector array with more sensing elements is used to detect multiple beams with unknown sizes and positions, then the adaptability and detection capability are improved, but the wiring complexity and interconnection length increase, resulting in bandwidth reduction and noise increase
Solution Approach 1:
The patent merges the sensing elements and signal processing components into a single integrated detector array structure. Each sensing element is directly coupled to its corresponding signal processing component within the same detector array, eliminating the need for complex external wiring and interconnections. This integration maintains detection flexibility while significantly reducing wiring complexity and interconnection length.
2Adaptability or versatility
If the detector array becomes more complicated with more sensing elements, then the detection coverage and adaptability are improved, but the interconnection length increases, resulting in bandwidth reduction
Solution Approach 1:
The patent transitions from a planar or external connection architecture to a three-dimensional integrated structure where sensing elements and signal processing components are stacked or layered within the same detector array volume. This dimensional reorganization allows multiple sensing elements to be connected to their respective signal processing components through short vertical or lateral paths rather than long external traces, maintaining high bandwidth even as detection coverage expands.
3Adaptability or versatility
If long interconnections are used in analog signal paths to connect sensing elements to signal processing components, then the detection coverage is improved, but noise and interference are introduced, deteriorating the signal-to-noise ratio
Solution Approach 1:
The patent extracts the signal processing functionality from separate external components and embeds it directly within each sensing element or in immediate proximity within the detector array. This extraction of signal processing from distant locations eliminates long analog signal paths that would otherwise introduce noise and interference, thereby maintaining high signal-to-noise ratio while preserving detection coverage.
4Productivity
If more sensing elements are integrated into the detector array, then the system throughput and detection speed are improved, but the wiring complexity and interconnection requirements increase
Solution Approach 1:
The patent implements a universal detector array architecture where each sensing element is self-contained with its own integrated signal processing component. This universal design allows any number of sensing elements to be added to the array without proportionally increasing interconnection complexity, as each element operates independently with local signal processing. The modular universal structure enables high system throughput while keeping interconnection requirements manageable.
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
The monolithic detector system enhances signal-to-noise ratio and system throughput, enabling faster and more accurate detection of charged particles, even at low beam currents, by minimizing interconnection losses and noise, thus improving the yield and efficiency of semiconductor manufacturing processes.
Implementation Method 1
each of the sensing elements configured to receive charged particles emitted from a sample and to generate carriers in proportion to a first property of a received charged particle
Implementation Method 2
each of the sensing elements configured to receive charged particles emitted from a sample and to generate carriers in proportion to a first property of a received charged particle
Data Source
AI summary
A monolithic detector may be used in a charged particle beam apparatus. The detector may include a plurality of sensing elements formed on a first side of a semiconductor substrate, each of the sensing elements configured to receive charged particles emitted from a sample and to generate carriers in proportion to a first property of a received charged particle, and a plurality of signal processing components formed on a second side of the semiconductor substrate, the plurality of signal processing components being part of a system configured to determine a value that represents a second property of the received charged particle. The substrate may have a thickness in a range from about 10 to 30 μm. The substrate may include a region configured to insulate the plurality of sensing elements formed on the first side from the plurality of signal processing components formed on the second side.