Nitride HEMT Heterojunction Structure for High-Frequency Carrier Mobility
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Solution Overview
Problem
Current semiconductor devices, particularly high electron mobility transistors (HEMTs), face challenges in achieving high carrier concentration and mobility, which are crucial for enhanced high-frequency performance.
Innovation Solution
A semiconductor device structure is proposed, featuring a substrate with a first nitride semiconductor layer and a second nitride semiconductor layer with a greater bandgap, along with specific configurations of gate conductors, field plates, and capacitors to optimize carrier mobility and concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional HEMT structures are used, then device simplicity is maintained, but carrier concentration and mobility remain insufficient for high-frequency performance
Solution Approach 1:
The device is segmented into distinct functional regions including a first region with a first nitride semiconductor layer and a second region with a second nitride semiconductor layer having different bandgaps. This segmentation allows each region to be optimized independently for carrier concentration and mobility, thereby improving high-frequency performance without requiring complete structural redesign of the entire device.
Solution Approach 2:
Different nitride semiconductor layers are employed in different regions of the device, with each layer having specific bandgap characteristics tailored to local requirements. The first nitride semiconductor layer provides one set of electrical properties while the second nitride semiconductor layer provides different properties, allowing local optimization of carrier concentration and mobility in specific device regions.
2Reliability
If dual-material capacitor structure is implemented, then electrical performance is enhanced, but manufacturing complexity increases
Solution Approach 1:
The first conductive layer and second conductive layer of the capacitor are formed as an integrated dual-material structure during the device fabrication process. By combining these conductive layers into a unified capacitor architecture, the manufacturing process achieves enhanced electrical performance through material optimization while maintaining process integration efficiency.
3Reliability
If field plates and capacitors are added to optimize carrier mobility, then device functionality is improved, but structural complexity increases
Solution Approach 1:
The field plates and capacitors are designed to serve multiple functions within the device architecture. The field plates not only optimize carrier mobility through electric field control but also contribute to overall device stability and performance. The capacitors provide electrical optimization while also serving as part of the integrated device structure, thereby reducing the need for separate dedicated components.
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 proposed device structure effectively enhances carrier mobility and concentration, leading to improved high-frequency performance and efficiency in semiconductor devices.
Implementation Method 1
the HEMT adopts two types of materials having different bandgaps that form a heterojunction, and the polarization of the heterojunction forms a two-dimensional electron gas (2DEG) region in the channel layer for providing a channel for the carriers
Data Source
AI summary
The semiconductor device includes a substrate, a first nitride semiconductor layer disposed on the substrate, a second nitride semiconductor layer disposed on the first nitride semiconductor layer and having a bandgap greater than that of the first nitride semiconductor layer. The semiconductor device further includes a first gate conductor disposed on a first region of the second nitride semiconductor layer, a first source electrode disposed on a first side of the first gate conductor, a first field plate disposed on a second side of the first gate conductor, a first conductive terminal and a second conductive terminal disposed on a second region of the second nitride semiconductor layer, and a resistor formed in the first nitride semiconductor layer and electrically connected between the first conductive terminal and the second conductive terminal, wherein the resistor comprises at least one conductive region.