Epitaxial Bridge Over Semiconductor Cavities
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Solution Overview
Problem
Current semiconductor device fabrication techniques face challenges in conserving wafer real estate while maintaining performance and integrity, particularly in forming openings within semiconductor materials without introducing defects due to lattice mismatches and the use of films or patterned masks.
Innovation Solution
The method involves forming openings entirely within semiconductor material, which are then filled or left empty, using epitaxial growth to bridge over these openings, thereby containing them within monocrystalline materials, and avoiding the use of films or patterned masks adjacent to the openings to reduce defect densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If openings are formed in semiconductor materials using conventional techniques with films or patterned masks, then the openings can be created for device fabrication, but defect densities increase due to lattice mismatches and film-related issues
Solution Approach 1:
The patent removes films and patterned masks from the opening formation process entirely. Openings are created directly in the semiconductor substrate using selective etching techniques, eliminating the intermediate film layers that cause lattice mismatches and defects. This extraction of problematic components resolves the contradiction between achieving precise openings and maintaining low defect densities.
Solution Approach 2:
The patent introduces a sacrificial layer as an intermediary material that facilitates opening formation without causing defects. This sacrificial layer is selectively removed to create openings, and it is designed to be compatible with the surrounding semiconductor materials, avoiding lattice mismatch issues while enabling precise opening definition.
2Productivity
If semiconductor wafer real estate is conserved through high integration, then more devices can be fabricated, but maintaining integrity and performance characteristics becomes more difficult
Solution Approach 1:
The patent applies local quality by creating regions with different properties within the semiconductor structure. Specific areas have modified characteristics (such as different doping concentrations, material compositions, or structural configurations) that are optimized for their local function while maintaining overall device integrity. This allows high integration without compromising performance characteristics.
Solution Approach 2:
The patent segments the semiconductor device into distinct functional regions and layers, each optimized for specific purposes. This segmentation allows independent optimization of different device components while maintaining overall system integrity, enabling high integration density without sacrificing device performance or reliability.
3Adaptability or versatility
If diverse microstructures are fabricated using semiconductor technologies, then optical waveguides and MEMS can be developed, but fabrication complexity increases
Solution Approach 1:
The patent establishes a universal fabrication platform that can produce multiple types of microstructures (optical waveguides, MEMS devices, integrated circuits) using the same basic process steps. The opening formation technique and material system are adaptable to different device types, reducing fabrication complexity while maintaining versatility.
Solution Approach 2:
The patent uses parameter changes (such as adjusting etching conditions, material compositions, or geometric dimensions) to adapt the fabrication process for different microstructure types. By modifying process parameters rather than changing fundamental fabrication approaches, the system achieves diverse microstructure fabrication with controlled 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 approach enhances low defectivity and improves integration by allowing for the formation of integrated circuitry, electromagnetic radiation interaction components, and other structures with reduced lattice mismatch issues, enabling better scalability and performance.
Implementation Method 1
using epitaxial growth to bridge over these openings, thereby containing them within monocrystalline materials
Data Source
AI summary
Some embodiments include formation of at least one cavity in a first semiconductor material, followed by epitaxially growing a second semiconductor material over the first semiconductor material and bridging across the at least one cavity. The cavity may be left open, or material may be provided within the cavity. The material provided within the cavity may be suitable for forming, for example, one or more of electromagnetic radiation interaction components, transistor gates, insulative structures, and coolant structures. Some embodiments include one or more of transistor devices, electromagnetic radiation interaction components, transistor devices, coolant structures, insulative structures and gas reservoirs.