Semiconductor Cap Layer Layout for e-Beam-Safe Pressure Sensors
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Solution Overview
Problem
Semiconductor devices, particularly pressure sensors, face challenges when exposed to electron beam irradiation, as it can alter their pressure sensing characteristics by introducing charge carriers and defects, leading to parasitic electronic fields and calibration issues.
Innovation Solution
A method involving doping lead-out regions and electrical components on a semiconductor substrate with specific dopants, forming a protective cap region of a different type to balance dielectric charges and prevent changes in carrier concentration, while ensuring the lead-out regions remain sensitive to mechanical strain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If semiconductor devices are exposed to e-beam irradiation for sterilization, then sterilization is achieved, but the electrical components suffer damage and calibration drift occurs
Solution Approach 1:
The semiconductor device is segmented into distinct functional regions: electrical components that require protection from e-beam irradiation, and lead-out regions that remain exposed for electrical connection. This spatial segmentation allows selective protection of sensitive areas while maintaining device functionality and sterilization capability.
Solution Approach 2:
A cap layer is introduced as an intermediary protective structure between the e-beam irradiation source and the electrical components. This cap layer absorbs or blocks the harmful e-beam radiation, preventing damage to the electrical components while allowing the lead-out regions to remain accessible for electrical connections.
2Object-affected harmful factors
If a protective cap layer is added to shield electrical components from e-beam irradiation, then protection is provided, but device structure becomes more complex
Solution Approach 1:
The protective cap layer is applied selectively only to the regions containing electrical components, while the lead-out regions remain exposed. This localized application provides protection precisely where needed without adding unnecessary structural complexity to the entire device.
Solution Approach 2:
The cap layer formation process is integrated with the existing semiconductor fabrication process steps, combining the protective function with the manufacturing workflow. This merging approach minimizes additional process steps and reduces overall device complexity.
3Object-affected harmful factors
If the entire surface is capped to protect from e-beam irradiation, then maximum protection is achieved, but lead-out regions lose electrical connectivity
Solution Approach 1:
The device surface is segmented into protected regions (electrical components under cap layer) and exposed regions (lead-out regions). This segmentation ensures that the cap layer provides maximum protection to sensitive areas while maintaining electrical connectivity at the lead-out regions.
Solution Approach 2:
The lead-out regions are extracted or excluded from the capped area, creating openings or exposed regions where electrical connections are made. This extraction allows the cap layer to provide comprehensive protection elsewhere without interfering with electrical connectivity.
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 enhances the reliability and accuracy of semiconductor devices by protecting them from e-beam irradiation effects, allowing them to maintain precise pressure sensing capabilities post-sterilization.
Implementation Method 1
heating the one or more lead-out regions at a first temperature, wherein the first dopant penetrates from the surface of the semiconductor substrate deeper into the semiconductor substrate
Implementation Method 2
doping one or more lead-out regions on a surface of a semiconductor substrate using a first dopant
Data Source
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AI summary
A fabrication method for protecting an electrical component on a semiconductor device when subjected to exposure to highly energized electrons, such as those emitted during e-beam irradiation, is provided. An example method may include doping one or more lead-out regions providing an electrical connection to the electrical component of the semiconductor device. In addition, the method may further include forming the electrical component to electrically connect to at least one of the one or more lead-out regions by doping the surface of the semiconductor substrate with a second dopant. Further, the method may include forming a protective barrier on the surface of the semiconductor substrate, substantially aligned with the one or more lead-out regions. The method may further comprise creating one or more cap regions substantially covering the entire surface of the semiconductor except for the lead-out regions by doping the surface of the semiconductor with a third dopant.