Interface dipole and band bending in the hybrid p − n heterojunction Mo S 2 / GaN ( 0001 ) - Archive ouverte HAL Access content directly
Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2017

Interface dipole and band bending in the hybrid p − n heterojunction Mo S 2 / GaN ( 0001 )

Debora Pierucci
Fausto Sirotti
Patrick Le Fevre

Abstract

Hybrid heterostructures based on bulk GaN and two-dimensional (2D) materials offer novel paths toward nanoelectronic devices with engineered features. Here, we study the electronic properties of a mixed-dimensional heterostructure composed of intrinsic n-doped MoS2 flakes transferred on p-doped GaN(0001) layers. Based on angle-resolved photoemission spectroscopy (ARPES) and high resolution x-ray photoemission spectroscopy (HR-XPS), we investigate the electronic structure modification induced by the interlayer interactions in MoS2/GaN heterostructure. In particular, a shift of the valence band with respect to the Fermi level for MoS2/GaN heterostructure is observed, which is the signature of a charge transfer from the 2D monolayer MoS2 to GaN. The ARPES and HR-XPS revealed an interface dipole associated with local charge transfer from the GaN layer to the MoS2 monolayer. Valence and conduction band offsets between MoS2 and GaN are determined to be 0.77 and −0.51eV, respectively. Based on the measured work functions and band bendings, we establish the formation of an interface dipole between GaN and MoS2 of 0.2 eV.
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Dates and versions

hal-01668118 , version 1 (07-09-2020)

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Hugo Henck, Zeineb Ben Aziza, Olivia Zill, Debora Pierucci, Carl H. Naylor, et al.. Interface dipole and band bending in the hybrid p − n heterojunction Mo S 2 / GaN ( 0001 ). Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2017, 96 (11), ⟨10.1103/PhysRevB.96.115312⟩. ⟨hal-01668118⟩
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