Heterostructure Semiconductor Layout for Stable ON-State Resistance
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Solution Overview
Problem
Existing semiconductor electronic devices based on heterostructures, such as HEMTs, have electrical performance that varies significantly with operating conditions, leading to low reliability, particularly in high-side switch configurations where the ON-state resistance can increase by 50% to 200% of its design value.
Innovation Solution
The semiconductor electronic device includes a die with a substrate of semiconductor material and a first electronic component featuring a body structure and an epitaxial multilayer with a heterostructure. A separation region surrounds the epitaxial multilayer, and the body structure comprises doped regions with different conductivity types, which helps to stabilize the electrical performance by decoupling the heterostructure from the substrate and other electronic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HEMTs are used for high-performance power switches and RF applications, then high breakdown threshold, high mobility, and low ON-state resistance are achieved, but electrical performance varies significantly with operating conditions leading to low reliability
Solution Approach 1:
A separation region is introduced as an intermediary element between the heterostructure and the body structure. This separation region comprises a first doped region with conductivity type opposite to the substrate, positioned between the heterostructure and the body structure. The separation region acts as a mediator that decouples the heterostructure from the body structure and substrate, preventing direct interaction that causes performance variability. This intermediary structure stabilizes the electrical performance by isolating the sensitive heterostructure from operating condition variations in the body structure.
2Ease of manufacture
If HEMTs are integrated on silicon or sapphire substrates, then manufacturing is enabled, but ON-state resistance increases by 50% to 200% of design value when used as high-side switch in source-follower configuration
Solution Approach 1:
The separation region serves as a buffer intermediary between the heterostructure and the substrate/body structure. By positioning the doped region between these components, it mediates the electrical interaction, preventing the substrate and body structure from directly influencing the heterostructure's electrical characteristics. This intermediary structure enables standard substrate integration while maintaining precise control over ON-state resistance, eliminating the 50-200% increase observed in conventional configurations.
3Reliability
If the heterostructure is directly connected to the substrate and body structure, then device complexity is reduced, but electrical performance depends on operating conditions
Solution Approach 1:
The device structure is segmented by introducing a separation region that divides the direct connection between the heterostructure and the body structure/substrate. This segmentation creates distinct functional zones: the heterostructure region, the separation region with opposite-doped first doped region, and the body structure. The segmentation isolates the heterostructure's electrical characteristics from the body structure, ensuring performance consistency while adding a controlled structural element that manages the complexity through functional decomposition.
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 configuration enhances the reliability of the semiconductor electronic device by maintaining a stable ON-state resistance and reducing the dependence on operating voltages, thereby improving the device's electrical performance and reliability.
Implementation Method 1
the conductive channel is based upon formation of layers of two-dimensional electron gas (2DEG) with high-mobility electrons that form at a heterojunction, i.e., at the interface between semiconductor materials that have different band gaps
Implementation Method 2
the body structure of the first electronic component comprises a first doped region of semiconductor material extending between the heterostructure and the substrate and having a second conductivity type different from the first conductivity type
Data Source
AI summary
A semiconductor electronic device is formed in a die having a substrate of semiconductor material of a first conductivity type. The device has a first electronic component based on heterostructure, which has a body structure of semiconductor material that extending, in the die, on the substrate, and an epitaxial multilayer extending in contact with the body structure and having a heterostructure. The body structure of the first electronic component has a first doped region of semiconductor material that extends between the heterostructure and the substrate and has a second conductivity type different from the first conductivity type.