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Annealing of thin-film cadmium telluride photovoltaics using holographically controlled laser processing

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conference contribution
posted on 03.11.2016 by Nick Goffin, Fabiana Lisco, Gianfranco Claudio, John Tyrer, Elliot Woolley
CdTe-based thin film solar cells currently represent one of the fastest growing PV technologies, with a superior combination of efficiency, energy payback time and lifecycle environmental impact. However, the current post-deposition annealing treatment is still an energy intensive step of the manufacturing process. A novel method is presented for annealing of CdTe using a high-power diode laser (35 W, 808 nm) for thermal post-processing, combined with holographic optical elements (HOE’s) for laser beam heat flow control. The advantage of a laser for annealing lies in its ability to selectively heat only the surface of the CdTe solar cell; improving energy efficiency, process speed and energy resilience. Heat transfer simulations were used to predict the effects of different laser irradiance profiles on the annealing process thermal cycle influence the experimental design and predict optimal laser irradiance profiles. Variations in power and process speed on as-deposited and MgCl2-treated close-space sublimated (CSS) CdTe samples have been performed. The results were characterised using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Optical properties were analysed with a spectrophotometer and ellipsometric spectroscopy (SE). The laser annealing treatment was found to be effective in promoting Chlorine diffusion and improving the optical and morphological properties of CdTe thin film devices

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

EMRS 2016 Spring Meeting Energy Procedia

Volume

102

Pages

70-79

Citation

GOFFIN, N.J. ...et al., 2016. Annealing of thin-film cadmium telluride photovoltaics using holographically controlled laser processing. Energy Procedia, 102 pp.70-79.

Publisher

© The Authors. Published by Elsevier

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

29/09/2016

Publication date

2016-12-28

Notes

This paper was presented at the EMRS 2016 Spring Meeting, Lille, France, May 2-6th. This is an open access article under the CC BY-NC-ND license.

ISSN

1876-6102

Language

en

Location

Lille, France

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