Fabrication control of MoS₂/MoO₂ nanocomposite via chemical vapor deposition for optoelectronic applications

D. Mouloua (1, 2) , N.S. Rajput (3) , Jean-François Blach (4) , M. Lejeune (1) , M. El Marssi (1) , M.A. El Khakani (2) , M. Jouiad (1)

1 LPMC - Laboratoire de Physique de la Matière Condensée - UR UPJV 2081
2 Institut National de la Recherche Scientifique, Centre Énergie, Matériaux et Télécommunications, , Canada
3 ADU - Abu Dhabi University
4 UCCS Équipe Couches Minces & Nanomatériaux

We report on the fabrication and control of MoS₂/MoO₂ nanocomposites exhibiting various optoelectronic properties. We demonstrate the growth of various compositions, shapes and crystalline structures by chemical vapor deposition (CVD). Microplates 1 to 30 µm to highly crystalline nanowires ∼ 100 nm in diam. are obtained. Our findings show that depending on the MoO₂ content the band gap varies from 2 eV to 2.4 eV, whereas nanowires sample exhibits the lowest reflectance ≤ 10 % for λ ≥ 450 nm. Furthermore, the photoelectric properties of the produced samples were characterized by integrating them into photoconductive devices. Our results demonstrate a good photoresponse achieving 2 × 104 %, a responsivity as high as 1.13 mA/W, and a specific detectivity of 2.6 × 109 Jones for the nanowires, with a relatively rapid rise and decay times 1.6 s and 0.8 s, respectively. This work emphasizes the high potential of MoS₂/MoO₂ nanocomposite for the development of highly responsive optoelectronic devices.

Mots clés: MoS2/MoO2 nanocomposite; MoS2/MoO2 heterostructure; MoS2 nanowires; Chemical vapor deposition; Photocurrent; Photoresponse

Domaines: Matériaux; Optique [physics.optics]

D. Mouloua, N.S. Rajput, Jean-François Blach, M. Lejeune, M. El Marssi, et al.. Fabrication control of MoS₂/MoO₂ nanocomposite via chemical vapor deposition for optoelectronic applications. Materials Science and Engineering: B, 2022, 286, pp.116035. ⟨10.1016/j.mseb.2022.116035⟩. ⟨hal-03797110⟩