Highly sensitive p-type 4H-SiC van der Pauw sensor.

Area of Science:

• Materials Science
• Semiconductor Physics
• Sensor Technology

Background:

• Strain sensors are crucial for monitoring structural integrity in various applications.
• Traditional two-terminal sensors often require complex resistance-to-voltage conversion.
• Silicon carbide (SiC) offers excellent mechanical and thermal properties for harsh environments.

Purpose of the Study:

• To develop and characterize a novel p-type 4H silicon carbide (4H-SiC) van der Pauw strain sensor.
• To leverage the strain-induced effect in a four-terminal configuration for enhanced performance.
• To evaluate the sensor's suitability for applications in harsh environments.

Main Methods:

• Fabrication of a p-type 4H-SiC van der Pauw sensor using a 1 μm epilayer (10^18 cm^-3).
• Utilizing a four-terminal configuration to directly measure strain-induced voltage.
• Testing sensor performance, including repeatability, linearity, and sensitivity across various orientations.

Main Results:

• The developed sensor demonstrates excellent repeatability and linearity over a strain range of 0 to 334 ppm.
• A high sensitivity of 26.3 ppm^-1 was achieved.
• The four-terminal design eliminates the need for resistance-to-voltage conversion.

Conclusions:

• The p-type 4H-SiC van der Pauw strain sensor offers a promising solution for accurate strain monitoring.
• Its performance, combined with the inherent properties of 4H-SiC, makes it ideal for harsh environments.
• This novel sensor design advances the field of semiconductor-based strain sensing.