Thermal Vacuum Deposition of Cadmium Telluride Thin Films Solar Cell Material
Cadmium Telluride (CdTe) thin films were deposited on glass substrate using thermal evaporation technique to avoid the inclusion of impurities in the films. 500 nm, 900 nm and 1000 nm deposited CdTe thin films were measured by insitu thickness monitor. The structural studies of the films were carried out using X –ray Diffraction (XRD) and optical transmittance and absorption measurement was carried out using UV-VIS-NIR spectrophotometer. All CdTe thin films grown at 250°C temperature are polycrystalline and show X-ray diffraction peaks at angles reported in research papers. The optical transmission spectra of 1000 nm CdTe films show a high transmission of about 82% in visible region with a sharp fall near the fundamental absorption at 850 nm. Films were subjected to scanning electron microscopy to study the growth features of the annealed films. The high optical absorption co-efficient about 106 and ~1.6 eV direct band gap of the films indicate that the films are useful as an absorber for photovoltaic application in the solar cell.
Thin Film Materials, Solar Cell, Thermal Deposition
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