Direct Epitaxial Growth of InP Nanowires on MoS₂ with Strong Nonlinear Optical Response

Abstract

Mixed-dimensional van der Waals heterostructures are promising for research and technological advances in photonics and optoelectronics. Here we report vapor–liquid–solid (VLS) method-based van der Waals epitaxy of one-dimensional InP nanowires (NWs) directly on two-dimensional MoS2. With optimized growth parameters (V/III ratio, flow rates of precursors, and growth temperature), we successfully grow high-quality InP NWs on MoS2. The density and vertical yield of NWs on MoS2 are significantly high. Due to the unique properties of both materials, we observe strong linear and nonlinear optical responses from the NW/MoS2 heterostructures. Intriguingly, in addition to strong second and third harmonic responses, the mixed-dimensional heterostructures show odd-order high harmonic generation up to seventh order. Our findings can open new possibilities for advancing attosecond physics on a new platform of mixed-dimensional heterostructures.

MXene V2CTx Nanosheet/Bismuth Quantum Dot-Based Heterostructures for Enhanced Flexible Photodetection and Nonlinear Photonics

“…In 2020, Wu et al reported that taking advantage of low-temperature solution-processability, excellent light absorption coefficient, and long charge carrier diffusion length, 0D perovskite CsPbI 3– x Br x QDs were integrated onto monolayer MoS 2 to facilitate the interfacial photocarrier separation and carrier injection, which exhibited a high R of 7.7 × 10 4 A W –1 , a specific detectivity of ≈5.6 × 10 11 Jones, and an external quantum efficiency exceeding 10 7 %. In addition, in 2022, a mixed-dimensional heterostructure based on 1D InP nanowires and 2D MoS 2 NSs was successfully fabricated by a vapor–liquid–solid method, which demonstrated stronger second and third harmonic responses and odd-order high harmonic generation up to seventh order . Based on these merits of mixed-dimensional heterostructures, it is anticipated that 2D/0D mixed-dimensional heterostructures can make full use of the merits of each component, MXene and Bi, to meet the growing demand of next-generation (opto)­electronic devices and advanced photonic devices.…”