High-barrier Schottky contact on n-type 4H-SiC epitaxial layer and studies of defect levels by deep level transient spectroscopy (DLTS)

Khai V. Nguyen; Rahmi O. Pak; Cihan Oner; Mohammad A Mannan; Krishna C. Mandal

doi:10.1117/12.2196592

26 August 2015 High-barrier Schottky contact on n-type 4H-SiC epitaxial layer and studies of defect levels by deep level transient spectroscopy (DLTS)

Khai V. Nguyen, Rahmi O. Pak, Cihan Oner, Mohammad A Mannan, Krishna C. Mandal

Author Affiliations +

Proceedings Volume 9593, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVII; 95930I (2015) https://doi.org/10.1117/12.2196592
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

High barrier Schottky contact has been fabricated on 50 μm n-type 4H-SiC epitaxial layers grown on 350 μm thick substrate 8° off-cut towards the [11̅20] direction. The 4H-SiC epitaxial wafer was diced into 10 x 10 mm² samples. The metal-semiconductor junctions were fabricated by photolithography and dc sputtering with ruthenium (Ru). The junction properties were characterized through current-voltage (I-V) and capacitance-voltage (C-V) measurements. Detectors were characterized by alpha spectroscopy measurements in terms of energy resolution and charge collection efficiency using a 0.1 μCi ²⁴¹Am radiation source. It was found that detectors fabricated from high work function rare transition metal Ru demonstrated very low leakage current and significant improvement of detector performance. Defect characterization of the epitaxial layers was conducted by deep level transient spectroscopy (DLTS) to thoroughly investigate the defect levels in the active region. The presence of a new defect level induced by this rare transition metal-semiconductor interface has been identified and characterized.

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Khai V. Nguyen, Rahmi O. Pak, Cihan Oner, Mohammad A Mannan, and Krishna C. Mandal "High-barrier Schottky contact on n-type 4H-SiC epitaxial layer and studies of defect levels by deep level transient spectroscopy (DLTS)", Proc. SPIE 9593, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XVII, 95930I (26 August 2015); https://doi.org/10.1117/12.2196592

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