Embedded Resonator Wafers with Acoustic Reflectors
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Solution Overview
Problem
Current semiconductor manufacturing processes are labor-intensive and time-consuming due to the need for extensive metrology on test substrates, limiting the ability to monitor processing parameters in real-time and determine the rate of change of these parameters during fabrication.
Innovation Solution
Diagnostic substrates equipped with micro resonator sensors and reflector rings that allow for in-situ monitoring of processing parameters by driving the resonator to multiple resonance modes, recording resonant frequencies, and determining processing parameters from these frequencies, thereby reducing the need for cross-sectional analysis and enhancing quality factor for improved resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cross-sectional analysis of test substrates is used to determine processing parameters, then measurement precision is improved, but loss of time and productivity deteriorate significantly
Solution Approach 1:
The patent incorporates resonator structures into the substrate during the fabrication process itself, rather than adding them later for measurement. This preliminary integration allows the resonators to be ready for immediate use as processing occurs, eliminating the need for separate cross-sectional analysis steps and enabling real-time monitoring throughout fabrication.
Solution Approach 2:
The patent replaces the mechanical cross-sectional analysis method with an acoustic resonance-based measurement system. Instead of physically sectioning substrates and visually inspecting them, the system uses resonant frequency shifts of embedded resonators to non-destructively measure processing parameters in real-time, dramatically reducing measurement time.
2Manufacturing precision
If extensive metrology on test substrates is performed, then manufacturing precision is improved, but productivity deteriorates due to labor-intensive processes
Solution Approach 1:
The resonator structures serve dual purposes: they are part of the functional device being fabricated and simultaneously serve as sensors for monitoring the fabrication process. This self-service capability eliminates the need for separate test substrates and metrology operations, allowing the production substrates themselves to provide measurement data.
Solution Approach 2:
The resonator structures perform multiple functions: they are both functional elements of the semiconductor device and sensing elements for process monitoring. This multi-functionality eliminates the need for dedicated test structures, reducing the number of substrates required and accelerating process development.
3Device complexity
If only end result analysis is performed on test substrates, then device complexity is reduced, but loss of information deteriorates as process dynamics cannot be determined
Solution Approach 1:
The resonator structures continuously monitor processing parameters throughout the fabrication process, providing ongoing measurements rather than single end-point measurements. This continuous data stream captures the dynamics of process changes, enabling determination of rates of change and real-time process optimization.
4Reliability
If reflector structures are added around resonators, then quality factor is improved, but device complexity increases
Solution Approach 1:
The reflector structures are integrated with the resonator structures as a unified acoustic confinement system, rather than being separate components. This merging approach improves quality factor while minimizing the increase in device complexity, as the reflectors and resonators work together as a single functional unit.
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 accelerates process development by enabling high-resolution monitoring of critical dimensions at the nanometer scale with accuracy in parts per million, allowing for real-time monitoring of processing parameters and their uniformity across the substrate surface, significantly reducing the time and labor required for metrology.
Implementation Method 1
a reflector surrounding a perimeter of the resonator. In an embodiment, the reflector is configured to reflect acoustic energy back to the resonator
Implementation Method 2
a resonator in the device layer. In an embodiment, the resonator comprises a cavity, a cover layer over the cavity, and electrodes within the cavity for driving and sensing resonance of the cover layer
Data Source
AI summary
Embodiments disclosed herein include diagnostic substrates and methods of using such substrates. In an embodiment, a diagnostic substrate comprises a substrate, and a device layer over the substrate. In an embodiment, the diagnostic substrate further comprises a resonator in the device layer. In an embodiment, the resonator comprises a cavity, a cover layer over the cavity, and electrodes within the cavity for driving and sensing resonance of the cover layer. In an embodiment, the diagnostic substrate further comprises a reflector surrounding a perimeter of the resonator.