ANNEALED In2S3 THIN FILMS PREPARED BY SPRAY TECHNIQUE: REPORT ON THE STRUCTURAL, OPTICAL AND DISPERSION ENERGY PARAMETERS

作者：Y., BCHIRI; N., BOUGUILA; M., KRAINI; S., ALAYA

来源：Surface Review and Letters, 2019, 26(07): 1850223.

DOI：10.1142/s0218625x18502232

<jats:p> In<jats:sub>2</jats:sub>S<jats:sub>3</jats:sub> thin films with different S/In molar ratios (from 1.5 to 3.5) were deposited via a spray pyrolysis technique on glass substrates at 340<jats:sup>∘</jats:sup>C. Then, the obtained films were annealed at the same temperature 400<jats:sup>∘</jats:sup>C for 2[Formula: see text]h. X-ray diffraction study reveals the formation of cubic [Formula: see text]-In<jats:sub>2</jats:sub>S<jats:sub>3</jats:sub> phase with (400) as preferred orientation. The crystallite size varies in the range 64–97[Formula: see text]nm. Optical analysis exhibits that transmittance in visible and near infrared regions is higher than 65% for all films. The optical band gap varied from 2.58[Formula: see text]eV to 2.67[Formula: see text]eV. The optical parameters (refractive index, extinction coefficient, dielectric constants) were calculated through the transmittance ([Formula: see text]) and reflectance ([Formula: see text]). Dispersion parameters ([Formula: see text], [Formula: see text]), high frequency dielectric constant ([Formula: see text]), refractive index ([Formula: see text]), oscillator length strength ([Formula: see text]), average oscillator wavelength ([Formula: see text]) and optical moments ([Formula: see text]) were determined by Wemple–DiDomenico model. The surface and volume energy losses with photon energy were also calculated. The optical and electrical conductivities were estimated. These properties of In<jats:sub>2</jats:sub>S<jats:sub>3</jats:sub> films are important for photovoltaic applications. </jats:p>

• 出版日期2019-8
• 单位常州工学院