Semiconductor Integration via Lateral Expansion
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Solution Overview
Problem
Integrating different semiconductor materials with silicon to leverage their desirable properties in a single circuit is challenging due to lattice mismatch and polar/non-polar characteristics, making it difficult to fabricate optoelectronic devices with acceptable performance.
Innovation Solution
Growing one semiconductor material over a small area of another, allowing for lateral expansion to relax stress and accommodate thermal mismatch, thereby reducing anti-phase domain boundaries and enabling the integration of compound semiconductor materials with silicon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compound semiconductor materials are integrated with silicon to enable optoelectronic applications, then light conversion efficiency is improved, but lattice mismatch and anti-phase domain boundaries increase
Solution Approach 1:
The patent divides the semiconductor structure into distinct segments: a silicon substrate, a separating material layer, and a compound semiconductor material layer. This segmentation allows each material to maintain its optimal properties while minimizing interactions that cause lattice mismatch. The separating material layer acts as an interface that isolates the silicon substrate from the compound semiconductor, reducing the propagation of lattice mismatch and anti-phase domain boundaries.
Solution Approach 2:
The patent introduces a separating material layer as an intermediary between the silicon substrate and the compound semiconductor material. This intermediary layer serves as a buffer that accommodates the lattice mismatch between the two semiconductor materials. By placing this separating layer in between, the direct contact between silicon and compound semiconductor is prevented, thereby reducing the formation of anti-phase domain boundaries while still enabling functional integration for light conversion applications.
2Adaptability or versatility
If different semiconductor materials are integrated in a single circuit, then functional versatility is improved, but device complexity increases
Solution Approach 1:
The patent creates a universal integrated semiconductor circuit structure that can accommodate different compound semiconductor materials (such as GaAs, InP, etc.) on a silicon substrate. This universal platform enables multiple optoelectronic functions including light emission, detection, and modulation within a single circuit architecture. The separating material layer provides a universal interface that works with various compound semiconductor materials, allowing the system to achieve functional versatility without proportionally increasing device complexity.
Data Source
AI summary
An integrated semiconductor circuit includes a substrate having a surface of a first semiconductor material, at least one separating material formed on the surface and defining a through hole, and a guide region formed in the hole. The guide region comprises at least one second semiconductor material. The guide region comprises at least a first region and a second region having a larger cross-section than the first region. The first region contacts the surface of the substrate over a small contact region. Methods of making the integrated semiconductor circuit are also disclosed.