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Title: Oxygenated CdS window layers for thin film CdTe photovoltaics by pulsed DC magnetron sputtering
Authors: Kaminski, Piotr M.
Lisco, Fabiana
Abbas, Ali
Bowers, Jake W.
Claudio, Gianfranco
Walls, Michael
Keywords: CdS
CdS oxygenated
CdTe
Window layer
Issue Date: 2014
Publisher: © IEEE
Citation: KAMINSKI, P.M. ... et al, 2014. Oxygenated CdS window layers for thin film CdTe photovoltaics by pulsed DC magnetron sputtering. 2014 IEEE 40th Photovoltaic Specialist Conference, (PVSC), 8-13 June 2014, Denver, CO, pp.1626-1631.
Abstract: Absorption in the CdS window layer limits the photocurrent obtained from thin film CdTe solar cells. These absorption losses can be avoided by tailoring the band gap of the CdS material to improve the light transmission at shorter wavelengths. This can be achieved by adding oxygen to the CdS to create Oxygenated Cadmium Sulphide films (CdS:O). In this paper we report on a new process in which oxygen is incorporated into the thin film CdS during deposition by pulsed DC magnetron sputtering. Spectrophotometric measurements of transmission show that the absorption edge is shifted from 500nm to 350nm by incorporating the oxygen into the deposited films. In this way, light absorption in the window layer of the solar spectrum utilised by the CdTe solar cells was significantly reduced. Ellipsometric measurements showed that the refractive index of the CdS decreased from 2.45 to 2.1 at λ=632.8nm and the band gap shifted from 2.38eV to 3.1eV as a result of incorporating the oxygen into the film. The refractive index dispersion profiles suggest that the oxygenated films are amorphous/semi-amorphous and this was confirmed by X-ray Diffraction measurements and TEM cross-section images.
Description: This is a conference paper.
Version: Closed Access
DOI: 10.1109/PVSC.2014.6925231
URI: https://dspace.lboro.ac.uk/2134/17599
Publisher Link: http://dx.doi.org/10.1109/PVSC.2014.6925231
ISBN: 9781479943982
Appears in Collections:Closed Access (Mechanical, Electrical and Manufacturing Engineering)

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