Growth of MoOx nanobelts from molybdenum bi-layer thin films for thin film solar cell application

Puvaneswaran Chelvanathan, Kazi S. Rahman, Mohammad Hossain, Haroon Rashid, Norazlynda Samsudin, Siti Nurlieza Mustafa, Badariah Bais, Md Akhtaruzzaman, Nowshad Amin

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Abstract

This paper elucidates the properties of MoOx nanobelts grown by air annealing that is executed on DC-sputtered Mo bi-layers. Molybdenum thin films were deposited by DC Magnetron sputtering with DC power of 100 W at room temperature. First layer was sputtered at higher pressure to promote adhesion meanwhile second layer was sputtered at lower pressure to increase the conductivity of the film. Sputtered Mo film was annealed at 500 °C in air for duration ranging from 30 min to 150 min. The grown stacked structures were then characterized by Scanning Electron Microscopy (SEM), X-Ray Diffractometer (XRD), Atomic Force Microscopy (AFM) and Hall Effect measurement to elucidate the structural and electrical properties. The thickness of sputtered Mo films was in the range of 1 μm. All deposited Mo films passed the “Scotch Tape” indicating good adhesion with soda lime glass substrate and preferential crystal orientations were found to be (110) and (211) from XRD measurement. The formed MoOx compounds are primarily MoO3 and Mo4O11 as seen from the XRD spectra. However, MoO3 is the dominant phase with preferential orientation of (021). Crystallinity of MoOx increases with annealing time indicating higher diffusion of O2 from atmosphere into Mo film occurs hence yielding thicker MoOx layer. Surface topology probed by AFM indicates homogeneous surface and larger grain clusters are produced as annealing duration has increased.

Original languageEnglish
Pages (from-to)240-246
Number of pages7
JournalThin Solid Films
Volume621
DOIs
Publication statusPublished - 1 Jan 2017

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Keywords

  • Annealing
  • Mo bilayer
  • Mo thin films
  • MoO nanobelts
  • Sputtering
  • Thin films

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

Cite this

Chelvanathan, P., Rahman, K. S., Hossain, M., Rashid, H., Samsudin, N., Mustafa, S. N., Bais, B., Akhtaruzzaman, M., & Amin, N. (2017). Growth of MoOx nanobelts from molybdenum bi-layer thin films for thin film solar cell application. Thin Solid Films, 621, 240-246. https://doi.org/10.1016/j.tsf.2016.10.039