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- Title
Structural, optical, and photo-response properties of MoO3:W:S compound thin films prepared by spray pyrolysis: effect of annealing under sulfuration and bandgap modulation.
- Authors
Shomalian, B.; Ardyanian, M.; Bagheri-Mohagheghi, M. M.; shirpay, A.
- Abstract
In this research, MoO3 and MoS2-WS2 thin films were prepared on glass substrates by spray pyrolysis. The effect of tungsten (W), spray solution rate, and annealing at T = 450 °C under sulfuration on the structural, morphological, optical, and photoconductive properties of films has been investigated. The tungsten to molybdenum atomic concentration ratio of x = [W/Mo] was varied from 0 to 0.3 in the spray solution. The structural analysis by X-Ray diffraction technique indicated the formation of the single phase of MoS2 and both phases of MoS2 and WS2 in pure and MoS2: W films, respectively. Optical gap changes of the MoS2-WS2 thin films were studied by changing the sulfur and tungsten concentration. The optical band gap of the films was obtained in the range of 1.76–2.02 eV and 1.41–1.68 eV, for MoS2 and WS2 phases, respectively. The photo-response studies showed that the spray rate and concentrations of sulfur (S) and tungsten (W), play an important role in the sensitivity factor. This method can be used for energy gap modulation for optoelectronic devise applications.
- Subjects
THIN films; SULFURATION; PYROLYSIS; BAND gaps; ZINC oxide thin films; TUNGSTEN; MOLYBDENUM
- Publication
Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 9, p7288
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-022-07920-8