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Analysis and optimisation of the glass/TCO/MZO stack for thin film CdTe solar cells

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journal contribution
posted on 24.07.2018, 08:24 by Francesco Bittau, C. Potamialis, Mustafa Togay, Ali Abbas, Patrick Isherwood, Jake Bowers, Michael Walls
Magnesium-doped Zinc Oxide (MZO) films have recently been proposed as a transparent buffer layer for thin film CdTe solar cells. In this study, the band gap of MZO buffer layers was tuned for CdTe solar cells by increasing the substrate temperature during deposition. Films were deposited by radio-frequency magnetron sputtering. Devices incorporating an optimised MZO buffer layer deposited at 300 °C with a band gap of 3.70 eV yielded a mean efficiency of 12.5% and a highest efficiency of 13.3%. Transmission electron microscopy showed that MZO films are uniformly deposited on the transparent conductive oxide (TCO) layer surface. The favourable band alignment seems to positively counterbalance the low doping level of the MZO layer and its high lattice mismatch with CdTe. Titanium-doped indium oxide, tin-doped indium oxide and aluminium-doped zinc oxide TCOs were also used as alternatives to fluorine-doped tin oxide (FTO), in combination with MZO films. The use of titaniumdoped indium oxide and tin-doped indium oxide TCOs did not improve the device efficiency achieved compared with FTO, however using aluminium-doped zinc oxide coupled with a boro-aluminosilicate glass substrate the mean and highest efficiencies were further improved to 12.6% and 13.4% respectively.

Funding

The authors would like to thank support from the EPSRC for funding this research (EP/J017361/1 and EP/N026438/1).

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Solar Energy Materials and Solar Cells

Citation

BITTAU, F. ... et al, 2018. Analysis and optimisation of the glass/TCO/MZO stack for thin film CdTe solar cells. Solar Energy Materials and Solar Cells, 187, pp.15-22.

Publisher

Elsevier

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Acceptance date

18/07/2018

Publication date

2018

Notes

This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

ISSN

0927-0248

Language

en

Licence

Exports