Optical response of CdSe thin film prepared by spray pyrolysis technique
DOI:
https://doi.org/10.15407/hftp17.02.192Keywords:
CdSe thin films, chemical spray pyrolysis, optical properties and temperature effect on the grain sizeAbstract
In this research, Cadmium selenide CdSe thin films had been prepared using chemical spray pyrolysis method at a several substrate temperature (65, 85 and 105 °C). Cadmium Selenide CdSe thin films on glass slides were subjected to different testing techniques. The CdSe grain size decreases with deposition temperature increase. All the films are amorphous. The crystalline phase increases with temperature during the deposition. The X-ray spectrum show several peaks that belong to CdSe semiconductor. SEM images and XRD spectrum of the films show that the grain size is about 46.57 nm for the film prepared at 105 °C and increase to about 61 and 67.48 nm for the film prepared at 85 and 65 °C respectively. The optical properties including the transmittance, absorbance and energy gap were altered clearly with temperature. Eg shifted from 2 to 2.45 eV for the films prepared at 65 and 105 °C respectively. The current – voltage (I–V) measurements show an increase in the current with deposition temperature due to the decrease in the grain size
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