GaN IC Threshold Voltage Tuning for Monolithic HEMT Integration
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Solution Overview
Problem
Existing semiconductor devices in integrated circuits lack the ability to effectively integrate semiconductor devices with different threshold voltages, limiting their performance and efficiency in high-frequency applications.
Innovation Solution
The integration of semiconductor devices with varying threshold voltages is achieved by employing techniques such as varying gate layer thickness, barrier layer thickness, channel layer thickness, gate length, gate contact offset length, dopant concentration, and metal-barrier work functions, allowing for the inclusion of HEMTs, diodes, and other components with different threshold voltages on a single IC platform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semiconductor devices with different threshold voltages are integrated on a single IC platform, then performance and efficiency in high-frequency applications is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies local quality by varying the composition and thickness of the barrier layer at different spatial locations to create devices with different threshold voltages. Specifically, the barrier layer has different aluminum content or thickness in different regions, allowing each device to be optimized for its specific function while maintaining monolithic integration on a single IC platform.
Solution Approach 2:
The patent employs parameter changes by modifying the physical and chemical parameters of the barrier layer, including aluminum content, layer thickness, and composition ratios. These parameter variations enable the creation of multiple device types (enhancement mode, depletion mode, high voltage, low voltage) with different threshold voltages from the same base structure.
2Loss of energy
If multiple devices with different threshold voltages are integrated monolithically, then power consumption and size are reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies segmentation by dividing the barrier layer into distinct regions with different properties. The barrier layer is segmented into first and second portions with different aluminum content or thickness, allowing independent optimization of each device region while using a unified manufacturing process flow.
Solution Approach 2:
The patent achieves universality by creating a multi-functional barrier layer structure that can support multiple device types simultaneously. The same barrier layer formation process produces regions suitable for enhancement mode devices, depletion mode devices, high voltage devices, and low voltage devices, all from a single integrated structure.
3Object-generated harmful factors
If devices with tailored threshold voltages are integrated, then parasitics are reduced and high-efficiency power conversion is enabled, but the number of process steps increases
Solution Approach 1:
The patent applies merging by combining multiple device functions into a single integrated structure. Different threshold voltage devices are merged onto one IC platform using a unified barrier layer and channel layer, reducing inter-device parasitics and enabling high-efficiency power conversion through close integration of power switches, diodes, and control circuits.
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 enhances IC performance by reducing power consumption, size, and parasitics, enabling high-efficiency power conversion and other applications through monolithic integration of devices with tailored threshold voltages.
Implementation Method 1
A type of semiconductor device is a high electron mobility transistor (HEMT). A HEMT typically employs different semiconductor materials to form a heterojunction, where a channel may be formed near the heterojunction
Implementation Method 2
A HEMT may have a high speed operation, which makes HEMTs attractive for high frequency applications
Data Source
AI summary
The present disclosure generally relates to semiconductor devices in an integrated circuit (IC) that have different threshold voltages. In an example, an IC includes a semiconductor substrate, a channel layer, a barrier layer, a first semiconductor device, and a second semiconductor device. The channel layer is on the semiconductor substrate, and the channel layer includes a gallium nitride (GaN) material. The barrier layer is on the channel layer. The first semiconductor device is on the semiconductor substrate. The first semiconductor device includes a first terminal over the barrier layer, and the first semiconductor device has a first threshold voltage. The second semiconductor device is on the semiconductor substrate. The second semiconductor device includes a second terminal over the barrier layer, and the second semiconductor device has a second threshold voltage different from the first threshold voltage. The first and second threshold voltages are both positive or negative voltages.