Contributions of symmetric metal contacts on liquid exfoliation 2D-MoS2 flakes based MSM photodetector by spray pyrolysis: a CVD-free technique

• Published in: Optical and quantum electronics 2022-12, Vol.54 (12), Article 847
• Main Authors: Abdullah Ripain, A. H., Zulkifli, N. A. A., Tan, C. L., Abd Majid, W. H., Zakaria, R.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemical vapor deposition; Computer Communication Networks; Electrical Engineering; Electron beams; Energy gap; Exfoliation; Flakes; Gold; Lasers; Molybdenum disulfide; Optical Devices; Optics; Optoelectronic devices; Photometers; Photonics; Physics; Physics and Astronomy; Silver; Spray pyrolysis; Synthesis; Transition metal compounds
• ISSN: 0306-8919; 1572-817X
• DOI: 10.1007/s11082-022-04253-y

Molybdenum disulphide (MoS 2 ), is a typical layered of transition metal dichalcogenides which has been considered as a strong candidate in many optoelectronic devices due to its layer dependent bandgap and tunability properties. We reported a high yield synthesis of MoS 2 flakes prepared using mixed solvent exfoliation followed by feasible and cost-effective spray pyrolysis deposition, in other words; chemical vapor deposition (CVD) free technique. The photodetector based on MoS 2 flakes is fabricated using electron beam evaporation (e-beam) with symmetrical metals of Au and Ag contacts. The measurements were carried out under 632 nm illumination at power intensity ranging from 0.792 to 2.537 mW/cm 2 . The symmetrical of Au-MoS 2 /Si-based PD showed the highest photoresponsivity of 128.0 mA/W and specific detectivity of 1.32 × 10 10 Jones. This work demonstrates fecund synthesis of good quality MoS 2 flakes and the significance of metal choice in the photodetector as well as Schottky barrier height tuning which a good indicator for enhancing the device performance.