Structural, Optical and Photoluminescence Study of Nanocrystalline SnO2 Thin Films Deposited by Spray Pyrolysis

Abstract

Undoped SnO 2 thin films prepared by spray pyrolysis method reveal polycrystalline nature with prominent peaks along (110), (101) and (211) planes. All the films are nanocrystalline with particle size lying in the range of 3⋅14-8⋅6 nm calculated by DS formula. Orientation along plane (200) decreases continuously as molar concentration of SnO 2 increases. Dislocation density along plane (110) also decreases as molar concentration increases except 0⋅4 M SnO 2 thin film. Scanning electron microscopy image of the films contain jelly structures along with agglomerated clusters of particles. SnO 2 synthesized successfully, which confirms by Fourier transform infra-red spectroscopy. The optical transmittance spectra of 0⋅2 M SnO 2 thin film shows transmittance about 50-60% transmission in visible and near infrared region with a sharp cut off in the ultraviolet region. The transmission decreases in visible and near infrared region as molar concentration increases. Broad UV emission at 398 nm is observed in photoluminescence spectra of the films along with a blue emission, when excited at 250 nm wavelength. Emission intensity randomly changed as SnO 2 molar concentration increases. When excited at 320 nm, one UV and two visible peaks appeared at 385, 460 and 485 nm, respectively.

Structural and morphological properties of SnO2:Sb:F thin films produced by spray pyrolysis technique at various substrate temperatures

“…Because, the UV shift can be attributed to the increased crystallinity and a higher carrier concentration [51]. These values are like to the results reported by previous reports [19,52,53].…”

Structural, surface morphology and optical properties of NiSnO3 thin films prepared using spray technique

“…The blue and green emissions at 485 nm and 527 nm are probably related to the existence of various intrinsic defects in the NiSnO 3 crystal lattice. Akhilesh et al prepared undoped SnO 2 thin films by spray pyrolysis method at different concentration[21]. They have related the origin of both the peaks to defects or to defect levels associated with oxygen vacancies or X-ray diffraction spectra.…”

A Study on Sb and F Doped Tin Oxide Thin Films Preparing in Condition of Different Temperature and Molarity and Their Physical Comparison

“…It can be given for example spray pyrolysis (Yuwono et al, 2017), spin coating (Kadhim et al, 2017), pulsed laser deposition (Martin et al, 2004), dip coating (Carvalho et al, 2012) and sputtering (Zhu et al, 2017) methods. Among them, it was found that spray pyrolysis method have interesting properties such as simple and inexpensive experimental setup, reproducibility, easily adding of doping materials, preparing thin films with high quality (Tripathi and Shukla, 2014). The properties of TCOs thin films have been fabricated by spray can be changed with substrate temperature, spray time, spray flow rate, nozzle-substrate distance, precursors and solvents etc.…”