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IEICE TRANSACTIONS on Electronics

High-Quality AlGaN/GaN HEMTs on Epitaxial AlN/Sapphire Templates

Masahiro SAKAI, Kenta ASANO, Subramaniam ARULKUMARAN, Hiroyasu ISHIKAWA, Takashi EGAWA, Takashi JIMBO, Tomohiko SHIBATA, Mitsuhiro TANAKA, Osamu ODA

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Summary :

We have demonstrated AlGaN/GaN high electron mobility transistors (HEMTs) grown on epitaxial AlN/sapphire templates. The crystal qualities and fabricated device performances between AlGaN/GaN HEMTs on epitaxial AlN/sapphire templates and conventional AlGaN/GaN HEMTs on sapphire substrates with low-temperature buffer layer (LT-BLs) are compared with each other. By using epitaxial AlN/sapphire templates instead of LT-BLs, higher mobility was exhibited and superior crystal qualities were observed, as confirmed by X-ray diffraction (XRD), atomic force microscopy (AFM) images and capacitance-voltage measurements. In addition, the dc characteristics of the fabricated devices on epitaxial AlN/sapphire templates were enhanced. AlGaN/GaN HEMTs on epitaxial AlN/sapphire templates are promising candidates for practical applications of nitride-based electronic devices.

Publication
IEICE TRANSACTIONS on Electronics Vol.E86-C No.10 pp.2071-2076
Publication Date
2003/10/01
Publicized
Online ISSN
DOI
Type of Manuscript
Special Section PAPER (Special Issue on Heterostructure Microelectronics with TWHM2003)
Category

Authors

Keyword

AlGaN/GaN,  HEMT,  AlN,  template