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Title: Atmospheric-pressure plasma surface activation for solution processed photovoltaic devices
Authors: Lisco, Fabiana
Walls, Michael
Shaw, Alexander H.
Wright, Alexander
Iza, Felipe
Keywords: Atmospheric plasma
Cadmium sulphide thin films
Photovoltaic devices
Surface energy
Surface contamination
Atmospheric deposition processes
Issue Date: 2017
Publisher: © Crown Copyright. Published by Elsevier Ltd
Citation: LISCO, F. ...et al., 2017. Atmospheric-pressure plasma surface activation for solution processed photovoltaic devices. Solar Energy, 146, pp. 287–297.
Abstract: Atmospheric solution based processes are being developed for the fabrication of thin film photovoltaic devices. Deposition techniques such as electrodeposition, spin coating, spraying or printing are promising techniques to increase the throughput and reduce the cost per Watt of Copper-Indium-Gallium-Selenide (CIGS), Copper-Zinc-Tin-Sulphide (CZTS) and perovskite thin film solar technologies. All these technologies require pre-treatment of the substrate prior to the deposition of the thin film and ideally this pretreatment should also be performed at atmospheric pressure. Results presented in this paper show that use of an atmospheric-pressure plasma is highly effective in activating the surface of substrates commonly used in thin film photovoltaic (PV) device fabrication. Surface activation improves the adhesion of thin films. The use of an atmospheric activation process is compatible with a continuous vacuumfree PV fabrication process. Soda lime glass (SDL) and fluorine doped tin oxide (FTO) coated glass are substrates commonly used in the fabrication of photovoltaic modules. These substrates have been surface treated using a He/O2 atmospheric-pressure plasma, resulting in increased surface energy as evidenced by Water Contact Angle (WCA) measurements. The pre-treatment reduces adventitious surface contamination on the substrates as shown using X-ray Photoelectron Spectroscopy (XPS) measurements. The advantages of using the atmospheric plasma surface pre-treatment has been demonstrated by using it prior to atmospheric deposition of Cadmium Sulphide (CdS) thin films using a sonochemical process. The CdS thin films show pinhole-free coverage, faster growth rates and better optical quality than those deposited on substrates pre-treated by conventional wet and dry processes.
Description: This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/
Sponsor: This research was funded by EPSRC and the RCUK Supergen SuperSolar Hub through grants EP/ J017361/1 and EP/M014797/1.
Version: Published
DOI: 10.1016/j.solener.2017.02.030
URI: https://dspace.lboro.ac.uk/2134/24480
Publisher Link: http://dx.doi.org/10.1016/j.solener.2017.02.030
ISSN: 0038-092X
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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