Band alignment of B0.14Al0.86N/Al0.7Ga0.3N heterojunction

Haiding Sun, Young Jae Park, Kuang-Hui Li, C. G. Torres Castanedo, Abdulmohsen Alowayed, Theeradetch Detchprohm, Russell D. Dupuis, Xiaohang Li

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32 Scopus citations


Owing to large bandgaps of BAlN and AlGaN alloys, their heterojunctions have the potential to be used in deep ultraviolet and power electronic device applications. However, the band alignment of such junctions has not been identified. In this work, we investigated the band-offset parameters of a BAlN/AlGaN heterojunction grown by metalorganic vapor phase epitaxy. These specific compositions were chosen to ensure a sufficiently large band offset for deep ultraviolet and power electronic applications. High resolution transmission electron microscopy confirmed the high structural quality of the heterojunction with an abrupt interface and uniform element distribution. We employed high resolution X-ray photoemission spectroscopy to measure the core level binding energies of B 1s and Ga 2p with respect to the valence band maximum of BAlN and AlGaN layers, respectively. Then, we measured the energy separation between the B 1s and Ga 2p core levels at the interface of the heterojunction. The valence band offset was determined to be 0.40 ± 0.05 eV. As a consequence, we identified a staggered-gap (type-II) heterojunction with the conduction band offset of 1.10 ± 0.05 eV. The determination of the band alignment of the BAlN/AlGaN heterojunction facilitates the design of optical and electronic devices based on such junctions.
Original languageEnglish (US)
Pages (from-to)122106
JournalApplied Physics Letters
Issue number12
StatePublished - Sep 21 2017

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: The KAUST authors would like to acknowledge the support of GCC Research Program No. REP/1/3189-01-01, Baseline No. BAS/1/1664-01-01, and Equipment No. BAS/1/1664-01-07. The work at Georgia Institute of Technology was supported in part by DARPA under Grant No. W911NF-15-1-0026 and NSF under Grant No. DMR-1410874. R.D.D. acknowledges the additional support of the Steve W. Chaddick Endowed Chair in Electro-Optics and Georgia Research Alliance.


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