Open AccessCharacteristics and Optical Properties of Fluorine Doped SnO2 Thin Film Prepared by a Sol–Gel Spin Coating
Author(s) -
Susilawati Susilawati,
Aris Doyan,
Lalu Muliyadi,
Syamsul Hakim,
Muhammad Taufik,
Nazarudin Nazarudin
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1397/1/012003
Subject(s) - band gap , spin coating , materials science , thin film , doping , absorption edge , analytical chemistry (journal) , absorbance , transmittance , sol gel , optoelectronics , optics , chemistry , nanotechnology , organic chemistry , physics
This study aims to determine the optical properties of thin films which include absorbance, transmittance, energy band gap, and activation energy characterized by UV-Visible spectrophotometer (UV-vis) with a wavelength of 200-1100 nm. Tin dioxide (SnO 2 ) films are prepared by doping various Fluoride ion (F - ) concentrations (0, 5, 10, 15, 20 and 25%) on glass substrates using the sol-gel spin coating method. The absorption edge of SnO 2 thin films was found to accrue from 2.90 to 4.41 at 300 nm wavelength when the F - doped concentration increased from 0 to 25%. Furthermore, the transmittance also increased from 65.5 to 97.8% towards the wavelengths from 300 to 350 nm. However, the band gap and activation energies obtained decreased with a percentage increase in fluorine doping. The energy band gap decreased from 3.55-3.41 eV and 3.90-3.84 eV for direct as well as indirect allowed respectively, while the activation energy decreased from 4.04-1.99 eV. The band-gap energy of SnO 2 thin films also decreased, and the electrons adjustment from the valence to conduction band caused the conductivity of the film to increase.