Multilevel Semiconductor Device with Oxide-to-Oxide Bonding
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Solution Overview
Problem
Current methods for constructing RGB LEDs, image sensors, displays, and solar cells face challenges such as high costs, inefficiencies, and thermal expansion coefficient mismatches, leading to issues like cracking and limited spectral capture, which hinder the development of more efficient and cost-effective devices.
Innovation Solution
The use of monolithic 3D integration techniques, including ion-cut, porous silicon approaches, and oxide-to-oxide bonding, allows for the construction of multi-level semiconductor devices with crystalline silicon and integrated circuits, enabling efficient layer transfer and bonding at lower temperatures, thus overcoming thermal expansion issues and improving device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bonding methods are used to construct multi-level semiconductor devices, then device integration is achieved, but thermal expansion coefficient mismatches cause cracking and reliability issues
Solution Approach 1:
The patent introduces an intermediate oxide layer between dissimilar semiconductor materials with different thermal expansion coefficients. This oxide layer acts as a stress buffer that accommodates thermal expansion mismatches during bonding and subsequent thermal processing, preventing cracking while maintaining bond integrity. The oxide layer serves as a mediator that decouples the thermal stress between adjacent layers.
Solution Approach 2:
The patent changes the bonding temperature parameter by performing oxide-to-oxide bonding at lower temperatures (e.g., 400-600°C) compared to conventional direct semiconductor bonding. This temperature reduction minimizes thermal stress accumulation and prevents cracking caused by thermal expansion coefficient differences between dissimilar materials.
2Strength
If high temperature thermal processing is used for semiconductor bonding, then strong bonds are formed, but thermal expansion mismatches cause cracking and device defects
Solution Approach 1:
The patent fundamentally changes the bonding temperature parameter from high temperature (conventional semiconductor bonding) to low temperature (oxide-to-oxide bonding at 400-600°C). This parameter change achieves sufficient bond strength through oxide layer bonding while avoiding thermal stress-induced cracking between dissimilar materials with different thermal expansion coefficients.
Solution Approach 2:
The oxide layer serves as an intermediate bonding interface that enables strong adhesion between dissimilar semiconductor layers at low temperatures. The oxide-to-oxide bonding mechanism provides robust chemical bonding without requiring high temperatures that would generate damaging thermal stress in the overall device stack.
3Productivity
If conventional LED construction methods are used, then device functionality is achieved, but costs are high and efficiency is limited
Solution Approach 1:
The patent merges multiple semiconductor layers with different functionalities (photodetectors, LEDs, waveguides) into a single integrated multi-level device structure. This consolidation eliminates the need for separate devices and interconnections, reducing manufacturing complexity and costs while improving overall system efficiency through direct optical coupling between layers.
Solution Approach 2:
The patent transitions from planar (2D) device construction to three-dimensional (3D) stacked architecture. By stacking functional layers vertically, the device achieves higher integration density, improved optical coupling efficiency, and reduced manufacturing steps compared to conventional lateral arrangements, thereby lowering costs and enhancing productivity.
4Adaptability or versatility
If multi-level integration is implemented, then device functionality and spectral capture are improved, but manufacturing complexity increases
Solution Approach 1:
The oxide layer serves as a universal intermediate bonding interface that simplifies the manufacturing of multi-level devices. By providing a standardized oxide-to-oxide bonding mechanism, the patent reduces the complexity of integrating dissimilar semiconductor layers, as each layer can be independently fabricated and then bonded through the consistent oxide interface process.
Solution Approach 2:
The patent segments the multi-level device into independently fabricable layers, each with specific functionalities (photodetector layer, LED layer, waveguide layer). Each layer can be manufactured separately using optimized processes, then integrated through oxide-to-oxide bonding. This segmentation reduces overall manufacturing complexity by allowing parallel fabrication and independent optimization of each functional layer.
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 enables the creation of more efficient and cost-effective RGB LEDs, image sensors, and solar cells by reducing thermal processing temperatures, enhancing device integration, and improving spectral capture, while minimizing defects and costs.
Implementation Method 1
an oxide layer disposed between the first level and the second level, where the second level is bonded to the oxide layer, and where the bonded includes oxide to oxide bonds
Data Source
AI summary
A multi-level semiconductor device, the device including: a first level including integrated circuits; a second level including a structure designed to conduct electromagnetic waves, where the second level is disposed above the first level, where the first level includes crystalline silicon; an oxide layer disposed between the first level and the second level; and a plurality of electromagnetic modulators, where the second level is bonded to the oxide layer, and where the bonded includes oxide to oxide bonds.