1. Vanadium doping induces surface morphological changes of CuInS2 thin films deposited by chemical spray pyrolysis.
- Author
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Logu, T., Sankarasubramanian, K., Soundarrajan, P., Archana, J., Hayakawa, Y., and Sethuraman, K.
- Subjects
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THIN films , *VANADIUM , *PYROLYSIS , *X-ray photoelectron spectroscopy , *X-ray diffraction - Abstract
Pristine and vanadium (V) doped CuInS 2 (CIS) thin films were grown on glass substrate using home-built chemical spray pyrolysis unit. The structural, morphological, optical and electrical properties of pristine and V doped CIS thin films have been systematically inspected. The scanning electron and atomic force microscopic (SEM and AFM) images show the well-interconnected CIS nanoparticles changed to nanorods like morphology with respect to V doping level and also the number density of the nanorods increases with doping level. Furthermore, the formation of CIS nanoparticles and V doped CIS nanorods are authentically confirmed by the transmission electron microscopic (TEM) images. Both pristine and V doped CIS thin films exhibit the body centered tetragonal crystal structure along with polycrystalline nature which is characterized using X-ray diffraction (XRD) and selected area electron diffraction (SAED) patterns. The presence of dopant and host elements is confirmed by X-ray photoelectron and energy dispersive X-ray spectroscopic (XPS and EDX) analyses. The decreases of orbital energy gap values are observed using UV–Vis absorption spectra according to V doping level into the CIS lattice sites. A continuous suppression of defect related Cu-Au orderings are observed via Raman spectra as a function of V doping which also indicate the V doping significantly involved during deposition and improve the structural quality of the chalcopyrite CIS film. The electrical properties of CIS films transform enormously, switching from hole dominated (0.3782 S cm −1 ) p-type to electron dominated (27.16 S cm −1 ) n-type from 4 wt.% of V doping. It anticipates that this kind of self-assembled 1D CIS nanostructure will give huge interest to tune their physicochemical properties. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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