The structural properties of CdS deposited by chemical bath deposition and pulsed direct current magnetron sputtering
journal contributionposted on 30.04.2015, 11:17 by Fabiana Lisco, Piotr Kaminski, Ali Abbas, Kevin Bass, Jake Bowers, Gianfranco Claudio, Maria Losurdo, Michael Walls
Cadmium sulphide (CdS) thin films were deposited by two different processes, chemical bath deposition (CBD), and pulsed DC magnetron sputtering (PDCMS) on fluorine doped-tin oxide coated glass to assess the potential advantages of the pulsed DC magnetron sputtering process. The structural, optical and morphological properties of films obtained by CBD and PDCMS were investigated using X-ray photoelectron spectroscopy, X-ray diffraction, scanning and transmission electron microscopy, spectroscopic ellipsometry and UV-Vis spectrophotometry. The as-grown films were studied and comparisons were drawn between their morphology, uniformity, crystallinity, and the deposition rate of the process. The highest crystallinity is observed for sputtered CdS thin films. The absorption in the visible wavelength increased for PDCMS CdS thin films, due to the higher density of the films. The band gap measured for the as-grown CBD-CdS is 2.38 eV compared to 2.34 eV for PDCMS-CdS, confirming the higher density of the sputtered thin film. The higher deposition rate for PDCMS is a significant advantage of this technique which has potential use for high rate and low cost manufacturing.
The authors are grateful to the Engineering and Physical Science Research Council (EPSRC) (EP/J017361/1) for financial assistance under the Supergen SuperSolar Hub. They are also grateful to the Technology Strategy Board.
- Mechanical, Electrical and Manufacturing Engineering
- Centre for Renewable Energy Systems Technology (CREST)