Diamond Layer Nucleation on Insulating Layers for Heat Dissipation
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Solution Overview
Problem
Conventional techniques for depositing a diamond layer on semiconductor substrates using chemical vapor deposition (CVD) face high thermal resistance between the substrate and the diamond layer, hindering efficient heat transfer and dissipation.
Innovation Solution
A semiconductor device is fabricated with a substrate, an insulating layer, and metal particles on its surface, where a diamond layer is formed through CVD, utilizing the metal particles as growth nuclei to achieve a polycrystalline diamond layer with larger grain size, thereby enhancing thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diamond layer is deposited on a substrate using conventional CVD techniques, then a diamond layer is formed on the substrate, but high thermal resistance exists between the substrate and the diamond layer, preventing efficient heat transfer
Solution Approach 1:
The patent introduces metal particles as an intermediary layer between the substrate and the diamond layer. These metal particles serve as a mediator that facilitates thermal energy transfer from the substrate to the diamond layer, reducing the thermal resistance at the interface. The metal particles with specific surface areas (10-1000 μm²) create multiple contact points that enhance heat transfer efficiency.
Solution Approach 2:
The patent changes the physical and chemical parameters of the substrate surface by depositing metal particles with controlled surface areas and distributions. This modification of surface parameters (particle size, surface area, distribution density) enables improved thermal contact and reduces interfacial thermal resistance, allowing the diamond layer to effectively dissipate heat from the substrate.
2Reliability
If metal particles are added to the CVD process, then thermal resistance is reduced and heat dissipation is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies preliminary action by pre-depositing metal particles on the substrate surface before the diamond layer formation. This preparatory step ensures that the substrate surface is pre-equipped with thermal conductive elements, which then serve as nucleation sites for diamond growth and simultaneously provide thermal pathways. This sequencing simplifies the overall process by combining thermal management and diamond deposition in an integrated manner.
Solution Approach 2:
The metal particles serve multiple functions: they act as thermal conductors to reduce interfacial thermal resistance, serve as nucleation sites for diamond crystal growth, and provide a controlled surface morphology for uniform diamond layer deposition. This multi-functionality reduces the need for separate process steps, thereby managing manufacturing complexity while achieving multiple objectives.
3Device complexity
If a diamond layer is deposited directly on the substrate, then the structure is simple, but the grain size of the diamond layer is small, reducing thermal conductivity
Solution Approach 1:
The metal particles act as intermediary nucleation sites that facilitate the growth of larger diamond grains. By providing discrete metal particle surfaces with specific areas (10-1000 μm²), the patent enables controlled nucleation and growth of diamond crystals, resulting in larger grain sizes compared to direct deposition on the substrate. This intermediary approach maintains relative structural simplicity while significantly improving diamond grain morphology.
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
The approach significantly reduces thermal resistance and improves heat dissipation from the semiconductor element, preventing overheating and performance deterioration, resulting in a high-performance and high-quality semiconductor device.
Implementation Method 1
a diamond layer is deposited by chemical vapor deposition (CVD) on the surface of a substrate
Implementation Method 2
utilizing the metal particles as growth nuclei to achieve a polycrystalline diamond layer
Implementation Method 3
Diamond is one of materials with high thermal conductivity. Therefore, it is considered that a diamond layer with a high thermal conductivity, when provided on a substrate with a heat generator, allows heat generated in the substrate to be dissipated via the diamond layer
Data Source
AI summary
A semiconductor device includes a substrate, an insulating layer provided over the substrate, a collection of metal particles exposed on the surface of the insulating layer, and a diamond layer provided on the surface of the insulating layer on which the metal particles are exposed. By controlling the surface density and particle size of the metal particles on the surface of the insulating layer, the surface density of diamond nuclei that are formed on the surface is controlled. Diamond grains are formed by crystal growth using the diamond nuclei as starting material, thereby forming a diamond layer. The control of the surface density of the diamond nuclei results in forming, by the crystal growth, the diamond grains with a grain size exhibiting a relatively high thermal conductivity in the crystal growth initial layer of the diamond layer and improving the thermal conductivity between the diamond layer and the substrate.