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2022 Passivation of Grain Boundaries by Selenium_Fiducia et al.pdf (906.28 kB)

Selenium passivates grain boundaries in alloyed CdTe solar cells

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posted on 2022-02-11, 12:08 authored by Tom Fiducia, Ashley Howkins, Ali AbbasAli Abbas, Budhika Mendis, Amit Munshi, Kurt Barth, Walajabad Sampath, Michael WallsMichael Walls
Cadmium telluride (CdTe) solar cells have achieved efficiencies of over 22%, despite having absorber layer grain sizes less than 10 μm and hence a very high density of grain boundaries. Recent research has shown that this is possible because of partial passivation of grain boundaries during the widely used cadmium chloride treatment, and passivation of grain interior defects by selenium alloying of the CdTe. Here, state-of-the art TEM-based cathodoluminescence imaging is used to show that, in addition to grain interiors, selenium also passivates grain boundaries in alloyed Cd(Sex,Te1-x) material (CST). Specifically, we find that recombination at CST grain boundaries is up to an order of magnitude lower than at CdTe grain boundaries. This further explains the superior performance of selenium graded CdTe devices and provides potential new routes for further efficiency improvement and solar electricity cost reduction.

Funding

SUPERSOLAR Solar Energy Hub

Engineering and Physical Sciences Research Council

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EPSRC CDT in New and Sustainable Photovoltaics for a studentship

Loughborough Materials Characterisation Centre for access to the Helios PFIB, funded by the EPSRC grant EP/P030599/1

NSF award 1540007, NSF PFI:AIR-RA programme 1538733 and DOE SIPS award DE-EE0008177

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Solar Energy Materials and Solar Cells

Volume

238

Publisher

Elsevier BV

Version

  • AM (Accepted Manuscript)

Rights holder

© Elsevier

Publisher statement

This paper was accepted for publication in the journal Solar Energy Materials and Solar Cells and the definitive published version is available at https://doi.org/10.1016/j.solmat.2022.111595.

Acceptance date

2022-01-08

Publication date

2022-02-08

Copyright date

2022

ISSN

0927-0248

Language

  • en

Depositor

Prof Michael Walls. Deposit date: 11 February 2022

Article number

111595

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