SiC Schottky Diode Uniform Metal-Semiconductor Interface
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Solution Overview
Problem
Schottky diodes with silicon carbide (SiC) materials face challenges in achieving uniform metal-semiconductor interfaces, leading to discrepancies in electrical performance due to barrier height inhomogeneities, which affect ideality factors and characterization methods.
Innovation Solution
A SiC Schottky diode with a titanium Schottky metal barrier on a 4H-SiC epitaxial body and a back power electrode, resulting in a uniform metal-semiconductor interface, allowing for accurate electrical characterization and improved electrical behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Schottky diode fabrication is used, then manufacturing is simpler, but barrier height inhomogeneities occur leading to poor MSI quality
Solution Approach 1:
The patent applies preliminary action by performing surface preparation steps (chemical etching, plasma treatment, or atomic layer deposition of aluminum) on the SiC substrate before depositing the Schottky barrier metal. These preparatory steps create a uniformly activated surface that ensures homogeneous barrier height distribution when the titanium is deposited, thereby improving MSI quality without significantly complicating the overall fabrication process.
Solution Approach 2:
The patent employs parameter changes by controlling the deposition conditions of the titanium Schottky barrier metal, specifically maintaining a deposition temperature of 200-300°C and using controlled deposition rates. These parameter optimizations ensure uniform barrier height distribution and high MSI quality while keeping the fabrication process manageable.
2Measurement precision
If barrier height inhomogeneities are present, then manufacturing is easier, but electrical characterization becomes inaccurate due to discrepancies between C-V and I-V measurements
Solution Approach 1:
The patent applies preliminary action by performing surface preparation steps (chemical etching, plasma treatment, or atomic layer deposition of aluminum) on the SiC substrate before depositing the Schottky barrier metal. These preparatory steps create a uniformly activated surface that ensures homogeneous barrier height distribution when the titanium is deposited, thereby improving MSI quality without significantly complicating the overall fabrication process.
Solution Approach 2:
The patent employs parameter changes by controlling the deposition conditions of the titanium Schottky barrier metal, specifically maintaining a deposition temperature of 200-300°C and using controlled deposition rates. These parameter optimizations ensure uniform barrier height distribution and high MSI quality while keeping the fabrication process manageable.
3Ease of operation
If non-uniform MSI is used, then fabrication is simpler, but ideality factors deviate from unity indicating poor device performance
Solution Approach 1:
The patent applies preliminary action by performing surface preparation steps (chemical etching, plasma treatment, or atomic layer deposition of aluminum) on the SiC substrate before depositing the Schottky barrier metal. These preparatory steps create a uniformly activated surface that ensures homogeneous barrier height distribution when the titanium is deposited, thereby improving MSI quality without significantly complicating the overall fabrication process.
Solution Approach 2:
The patent employs parameter changes by controlling the deposition conditions of the titanium Schottky barrier metal, specifically maintaining a deposition temperature of 200-300°C and using controlled deposition rates. These parameter optimizations ensure uniform barrier height distribution and high MSI quality while keeping the fabrication process manageable.
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 solution achieves uniform electrical characteristics, with ideality factors close to unity and stable performance over a wide temperature range, confirming thermoionic emission behavior and high breakdown voltage, demonstrating improved MSI quality and device reliability.
Implementation Method 1
Schottky metal barrier formed of Titanium
Implementation Method 2
confirming thermoionic emission behavior
Data Source
AI summary
A SiC Schottky diode which includes a Schottky barrier formed on a silicon face 4H—SiC body.