Fin-Shaped AlN Buffer Layer for HEMT Thermal Dissipation
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Solution Overview
Problem
High Electron Mobility Transistors (HEMTs) face challenges with poor heat dissipation and electron overflow due to the use of thermally insulating materials and non-planar Quantum Well (QW) structures, which affect device performance and mobility.
Innovation Solution
A semiconductor device fabrication method involving a fin-shaped buffer layer, a Quantum Well material layer, and a barrier material layer, where the buffer layer is made of AlN for improved thermal conductivity, and the QW material layer is formed using selective epitaxy growth, along with a gate structure and cap layer to enhance device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If amorphous dielectrics (silicon oxide) are used to form UTB layer in HEMT device, then the device structure can be formed, but the heat dissipation performance deteriorates due to thermally insulating characteristic
Solution Approach 1:
The patent changes the material parameter from amorphous dielectric to crystalline dielectric (such as silicon nitride or silicon oxynitride), which fundamentally alters the thermal conductivity parameter from low (thermally insulating) to high (thermally conductive), thereby resolving the heat dissipation issue while maintaining manufacturing feasibility
Solution Approach 2:
The patent employs composite material structure by combining crystalline dielectric layers with specific crystal orientations (such as <100> or <111> oriented silicon nitride) to achieve both the required electrical insulation and superior thermal conductivity properties, creating a material composite that satisfies multiple competing requirements
2Productivity
If device dimension is scaled down, then integration density is improved, but short-channel effect worsens
Solution Approach 1:
The patent changes the structural parameter from non-planar to planar QW configuration, which fundamentally alters the electric field distribution parameter, enabling continued scaling to higher integration densities while maintaining effective short-channel control through the planar geometry's uniform field characteristics
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 method improves heat dissipation and reduces short-channel effects, maintaining high carrier mobility and enhancing the thermal stability and performance of HEMT devices.
Implementation Method 1
forming a Quantum Well (QW) material layer on a surface of the fin-shaped buffer layer, the QW material layer being suitable for forming an electron gas therein
Implementation Method 2
the buffer layer is made of AlN for improved thermal conductivity
Implementation Method 3
forming a barrier material layer on the QW material layer
Data Source
AI summary
A semiconductor device and a method for fabricating the same are disclosed. In the method, a substrate structure is provided, including a substrate and a fin-shaped buffer layer formed on the surface of the substrate. A QW material layer is formed on the surface of the fin-shaped buffer layer. A barrier material layer is formed on the QW material layer. The QW material layer is suitable for forming an electron gas therein. Thereby the short-channel effect is improved, while high mobility of the semiconductor device is guaranteed. In addition, according to the present disclosure, thermal dissipation of the semiconductor device may be improved, and thus performance and stability of the device may be improved.