Open AccessEffect of annealing on structural, morphological and optical properties of CdTe/(Cd-Zn)S thin films
Author(s) -
Devjyoti Lilhare,
Ayush Khare
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/798/1/012022
Subject(s) - cadmium telluride photovoltaics , high resolution transmission electron microscopy , materials science , photoluminescence , nucleation , annealing (glass) , transmission electron microscopy , band gap , thin film , analytical chemistry (journal) , scanning electron microscope , absorption spectroscopy , solar cell , crystallography , optoelectronics , optics , nanotechnology , chemistry , composite material , physics , organic chemistry , chromatography
Here, we present the results of an investigation on structural, morphological and optical properties of CdTe/(Cd-Zn)S films deposited on FTO substrate through electrodeposition technique for solar cell application. The deposited films were heat-treated in the presence of CdCl 2 for the recrystallization. Various techniques, such as X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), optical studies (absorption, transmission, band-gap and photoluminescence studies) were employed to examine the structural, morphological and optical properties. XRD spectra show the preferential orientation (111) in CdTe films. Uniform and bounded grains are observed upon annealing of the films. The changes in CdTe film were attributed to nucleation of the CdTe grains during the CdCl 2 treatment. The band-gap (E g ) value for CdTe estimated from absorption spectra and corresponding Tauc’s plots comes to be ~1.50eV. Summary of results suggests that the annealing of different component films is helpful in improving solar cell performance.