title: Band Alignment at GaN/Single-Layer WSe2Interface.
abstract: We study the band discontinuity at the GaN/single-layer (SL) WSe2heterointerface. The GaN thin layer is epitaxially grown by molecular beam epitaxy on chemically vapor deposited SL-WSe2/c-sapphire. We confirm that the WSe2was formed as an SL from structural and optical analyses using atomic force microscopy, scanning transmission electron microscopy, micro-Raman, absorbance, and microphotoluminescence spectra. The determination of band offset parameters at the GaN/SL-WSe2heterojunction is obtained by high-resolution X-ray photoelectron spectroscopy, electron affinities, and the electronic bandgap values of SL-WSe2and GaN. The valence band and conduction band offset values are determined to be 2.25 ± 0.15 and 0.80 ± 0.15 eV, respectively, with type II band alignment. The band alignment parameters determined here provide a route toward the integration of group III nitride semiconducting materials with transition metal dichalcogenides (TMDs) for designing and modeling of their heterojunction-based electronic and optoelectronic devices.
authors.affiliation: Photonics Laboratory, Computer, Electrical, and Mathematical Sciences and Engineering (CEMSE) Division, ‡Physical Science and Engineering (PSE) Division, and §Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia.
authors.forename: Malleswararao
authors.identifier: http://orcid.org/0000-0003-1141-4324
authors.initials: M
authors.lastname: Tangi
authors.affiliation: Photonics Laboratory, Computer, Electrical, and Mathematical Sciences and Engineering (CEMSE) Division, ‡Physical Science and Engineering (PSE) Division, and §Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia.
authors.forename: Pawan
authors.initials: P
authors.lastname: Mishra
authors.affiliation: Photonics Laboratory, Computer, Electrical, and Mathematical Sciences and Engineering (CEMSE) Division, ‡Physical Science and Engineering (PSE) Division, and §Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia.
authors.forename: Chien-Chih
authors.initials: CC
authors.lastname: Tseng
authors.affiliation: Photonics Laboratory, Computer, Electrical, and Mathematical Sciences and Engineering (CEMSE) Division, ‡Physical Science and Engineering (PSE) Division, and §Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia.
authors.forename: Tien Khee
authors.initials: TK
authors.lastname: Ng
authors.affiliation: Photonics Laboratory, Computer, Electrical, and Mathematical Sciences and Engineering (CEMSE) Division, ‡Physical Science and Engineering (PSE) Division, and §Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia.
authors.forename: Mohamed Nejib
authors.initials: MN
authors.lastname: Hedhili
authors.affiliation: Photonics Laboratory, Computer, Electrical, and Mathematical Sciences and Engineering (CEMSE) Division, ‡Physical Science and Engineering (PSE) Division, and §Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia.
authors.forename: Dalaver H
authors.initials: DH
authors.lastname: Anjum
authors.affiliation: Photonics Laboratory, Computer, Electrical, and Mathematical Sciences and Engineering (CEMSE) Division, ‡Physical Science and Engineering (PSE) Division, and §Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia.
authors.forename: Mohd Sharizal
authors.identifier: http://orcid.org/0000-0003-1369-1421
authors.initials: MS
authors.lastname: Alias
authors.affiliation: Photonics Laboratory, Computer, Electrical, and Mathematical Sciences and Engineering (CEMSE) Division, ‡Physical Science and Engineering (PSE) Division, and §Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia.
authors.forename: Nini
authors.initials: N
authors.lastname: Wei
authors.affiliation: Photonics Laboratory, Computer, Electrical, and Mathematical Sciences and Engineering (CEMSE) Division, ‡Physical Science and Engineering (PSE) Division, and §Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia.
authors.forename: Lain-Jong
authors.initials: LJ
authors.lastname: Li
authors.affiliation: Photonics Laboratory, Computer, Electrical, and Mathematical Sciences and Engineering (CEMSE) Division, ‡Physical Science and Engineering (PSE) Division, and §Imaging and Characterization Laboratory, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia.
authors.forename: Boon S
authors.initials: BS
authors.lastname: Ooi
keywords: 3D/2D heterojunction; GaN; HRXPS; band alignment; molecular beam epitaxy; single layer WSe2