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Three-step field-plated β-Ga 2 O 3 Schottky barrier diodes and heterojunction diodes with sub-1 V turn-on and kilovolt-class breakdown

https://doi.org/10.35848/1882-0786/ad36ab

Gilankar, Advait ; Islam, Ahmad Ehteshamul ; McCartney, Martha R. ; Katta, Abishek ; Das, Nabasindhu ; Smith, David J. ; Kalarickal, Nidhin Kurian ( April 2024 , Applied Physics Express)

Abstract
A unique field termination structure combining a three-step field plate with nitrogen ion implantation to enhance the reverse breakdown performance of Pt/β-Ga₂O₃Schottky barrier diodes (SBDs) and NiO/β-Ga₂O₃heterojunction diodes (HJDs) is reported. The fabricated devices showed a lowR_on,spof 6.2 mΩ cm²for SBDs and 6.8 mΩ cm²for HJDs. HJDs showed a 0.8 V turn-on voltage along with an ideality factor of 1.1 leading to a low effective on-resistance of 18 mΩ cm². The devices also showed low reverse leakage current (<1 mA cm⁻²) and a breakdown voltage of ∼1.4 kV. These results offer an alternative, simpler route for fabricating high-performance kilovolt-classβ-Ga₂O₃diodes.

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Compositional Control and Optimization of Molecular Beam Epitaxial Growth of (Sb 2 Te 3 ) 1–x (MnSb 2 Te 4 ) x Magnetic Topological Insulators

https://doi.org/10.1021/acs.cgd.1c01453

Levy, Ido ; Forrester, Candice ; Deng, Haiming ; Roldan-Gutierrez, Manuel ; McCartney, Martha R. ; Smith, David J. ; Testelin, Christophe ; Krusin-Elbaum, Lia ; Tamargo, Maria C. ( May 2022 , Crystal Growth & Design)

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Above 400-K robust perpendicular ferromagnetic phase in a topological insulator

https://doi.org/10.1126/sciadv.1700307

Tang, Chi ; Chang, Cui-Zu ; Zhao, Gejian ; Liu, Yawen ; Jiang, Zilong ; Liu, Chao-Xing ; McCartney, Martha R. ; Smith, David J. ; Chen, Tingyong ; Moodera, Jagadeesh S. ; et al ( June 2017 , Science Advances)

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Changes in band alignment during annealing at 600 °C of ALD Al 2 O 3 on (In x Ga 1 − x ) 2 O 3 for x = 0.25–0.74

https://doi.org/10.1063/5.0002875

Fares, Chaker ; Xian, Minghan ; Smith, David J. ; McCartney, Martha R. ; Kneiß, Max ; von Wenckstern, Holger ; Grundmann, Marius ; Tadjer, Marko ; Ren, Fan ; Pearton, S. J. ( March 2020 , Journal of Applied Physics)