Volume 220, Issue 16 2200871
Research Article

Investigation of Electrical Properties of N-Polar AlGaN/AlN Heterostructure Field-Effect Transistors

Daisuke Inahara

Daisuke Inahara

Department of Electrical and Electronic Engineering, Yamaguchi University, 2 -16-1 Tokiwadai, Ube, Yamaguchi, 755-8611 Japan

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Shunsuke Matsuda

Shunsuke Matsuda

Department of Electrical and Electronic Engineering, Yamaguchi University, 2 -16-1 Tokiwadai, Ube, Yamaguchi, 755-8611 Japan

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Wataru Matsumura

Wataru Matsumura

Department of Electrical and Electronic Engineering, Yamaguchi University, 2 -16-1 Tokiwadai, Ube, Yamaguchi, 755-8611 Japan

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Ryo Okuno

Ryo Okuno

Department of Electrical and Electronic Engineering, Yamaguchi University, 2 -16-1 Tokiwadai, Ube, Yamaguchi, 755-8611 Japan

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Koki Hanasaku

Koki Hanasaku

Department of Electrical and Electronic Engineering, Yamaguchi University, 2 -16-1 Tokiwadai, Ube, Yamaguchi, 755-8611 Japan

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Taketo Kowaki

Taketo Kowaki

Department of Electrical and Electronic Engineering, Yamaguchi University, 2 -16-1 Tokiwadai, Ube, Yamaguchi, 755-8611 Japan

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Minagi Miyamoto

Minagi Miyamoto

Department of Electrical and Electronic Engineering, Yamaguchi University, 2 -16-1 Tokiwadai, Ube, Yamaguchi, 755-8611 Japan

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Yongzhao Yao

Yongzhao Yao

Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta, Nagoya, Aichi, 456-0023 Japan

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Yukari Ishikawa

Yukari Ishikawa

Japan Fine Ceramics Center, 2-4-1 Mutsuno, Atsuta, Nagoya, Aichi, 456-0023 Japan

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Atsushi Tanaka

Atsushi Tanaka

Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University, Furocho, Chikusa, Nagoya, Aichi, 464-8601 Japan

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Yoshio Honda

Yoshio Honda

Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University, Furocho, Chikusa, Nagoya, Aichi, 464-8601 Japan

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Shugo Nitta

Shugo Nitta

Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University, Furocho, Chikusa, Nagoya, Aichi, 464-8601 Japan

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Hiroshi Amano

Hiroshi Amano

Institute of Materials and Systems for Sustainability (IMaSS), Nagoya University, Furocho, Chikusa, Nagoya, Aichi, 464-8601 Japan

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Satoshi Kurai

Satoshi Kurai

Department of Electrical and Electronic Engineering, Yamaguchi University, 2 -16-1 Tokiwadai, Ube, Yamaguchi, 755-8611 Japan

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Narihito Okada

Corresponding Author

Narihito Okada

Department of Electrical and Electronic Engineering, Yamaguchi University, 2 -16-1 Tokiwadai, Ube, Yamaguchi, 755-8611 Japan

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Yoichi Yamada

Yoichi Yamada

Department of Electrical and Electronic Engineering, Yamaguchi University, 2 -16-1 Tokiwadai, Ube, Yamaguchi, 755-8611 Japan

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First published: 16 May 2023

Abstract

AlN-based field-effect transistors (FETs) enable high-breakdown voltage, high drain current, and high-temperature operation. To realize high-frequency devices, N-polar AlGaN/AlN heterostructure FETs are focused on. N-polar Al0.1Ga0.9N/Al0.9Ga0.1N/AlN FET is fabricated using metal–organic vapor-phase epitaxy, and its electrical characteristics are evaluated. An N-polar AlN layer is grown on a sapphire substrate with a misorientation angle of 2.0° toward m-axis, on which a 20 nm thick Al0.9Ga0.1N base layer and a 20 nm Al0.1Ga0.9N channel layer are grown. The static FET operation is confirmed to exhibit an n-channel and pinch-off. Normally, during operation with a turn-on voltage of −3.2 V, a high operating breakdown voltage of 620 V and high operating temperature of 280 °C are also confirmed.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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