Evidence for highly p-type doping and type II band alignment in large scale monolayer WSe2/Se-terminated GaAs heterojunction grown by molecular beam epitaxy - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Nanoscale Année : 2022

Evidence for highly p-type doping and type II band alignment in large scale monolayer WSe2/Se-terminated GaAs heterojunction grown by molecular beam epitaxy

Mathieu Silly
Frédéric Bonell
Alain Marty
Matthieu Jamet
Hervé Boukari
Marco Pala

Résumé

Two-dimensional materials (2D) arranged in hybrid van der Waals (vdW) heterostructures provide a route toward the assembly of 2D and conventional III–V semiconductors. Here{,} we report the structural and electronic properties of single layer WSe2 grown by molecular beam epitaxy on Se-terminated GaAs(111)B. Reflection high-energy electron diffraction images exhibit sharp streaky features indicative of a high-quality WSe2 layer produced via vdW epitaxy. This is confirmed by in-plane X-ray diffraction. The single layer of WSe2 and the absence of interdiffusion at the interface are confirmed by high resolution X-ray photoemission spectroscopy and high-resolution transmission microscopy. Angle-resolved photoemission investigation revealed a well-defined WSe2 band dispersion and a high p-doping coming from the charge transfer between the WSe2 monolayer and the Se-terminated GaAs substrate. By comparing our results with local and hybrid functionals theoretical calculation{,} we find that the top of the valence band of the experimental heterostructure is close to the calculations for free standing single layer WSe2. Our experiments demonstrate that the proximity of the Se-terminated GaAs substrate can significantly tune the electronic properties of WSe2. The valence band maximum (VBM{,} located at the K point of the Brillouin zone) presents an upshift of about 0.56 eV toward the Fermi level with respect to the VBM of the WSe2 on graphene layer{,} which is indicative of high p-type doping and a key feature for applications in nanoelectronics and optoelectronics.

Dates et versions

hal-03674688 , version 1 (20-05-2022)

Identifiants

Citer

Debora Pierucci, Aymen Mahmoudi, Mathieu Silly, Federico Bisti, Fabrice Oehler, et al.. Evidence for highly p-type doping and type II band alignment in large scale monolayer WSe2/Se-terminated GaAs heterojunction grown by molecular beam epitaxy. Nanoscale, 2022, 14 (15), pp.5859-5868. ⟨10.1039/D2NR00458E⟩. ⟨hal-03674688⟩
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