High-temperature deep-level transient spectroscopy system for defect studies in wide-bandgap semiconductors

Area of Science:

• Materials Science
• Semiconductor Physics

Background:

• Investigating deep defect states and impurities in wide-bandgap materials is challenging due to high-temperature requirements.
• Commercial transient capacitance spectroscopy is limited in its operational temperature range.

Purpose of the Study:

• To develop a high-temperature deep-level transient spectroscopy (HT-DLTS) system for advanced defect characterization.
• To extend the measurable temperature range for deep defect studies up to 1100 K.

Main Methods:

• Development of a novel high-temperature deep-level transient spectroscopy (HT-DLTS) system.
• Characterization of intrinsic defects in n-type 4H-SiC using the developed HT-DLTS system.
• Measurements conducted on 4H-SiC Schottky diodes within the 300-950 K temperature range.

Main Results:

• The HT-DLTS system successfully operated up to 1100 K, enabling deeper defect analysis.
• Experimental results on 4H-SiC were consistent with existing literature.
• The study identified electrode performance and quality as a limiting factor for DLTS measurements.

Conclusions:

• The developed HT-DLTS system significantly expands the capability for characterizing deep defects in wide-bandgap semiconductors.
• Further research is needed to overcome electrode limitations for even more comprehensive DLTS analysis.
• This technology opens new avenues for understanding material properties at extreme temperatures.