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MOCVD of II-VI HRT/Emitters for Voc Improvements to CdTe Solar Cells

Andrew Clayton Orcid Logo, Ali Abbas, Peter Siderfin, Stephen Jones Orcid Logo, Ana Teloeken, Ochai Oklobia, John M. Walls, Stuart Irvine Orcid Logo

Coatings, Volume: 12, Issue: 2, Start page: 261

Swansea University Authors: Andrew Clayton Orcid Logo, Peter Siderfin, Ana Teloeken, Ochai Oklobia, Stuart Irvine Orcid Logo

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Abstract

CdTe solar cells were produced using metal organic chemical vapour deposition (MOCVD),which employed a (Zn,Al)S (AZS) high resistant transparent (HRT) layer at the transparent conductingoxide (TCO)/Cd(Zn)S emitter interface, to enable the higher annealing temperature of 440 ◦C to beemployed in the c...

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Published in: Coatings
ISSN: 2079-6412
Published: MDPI AG 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa60732
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Abstract: CdTe solar cells were produced using metal organic chemical vapour deposition (MOCVD),which employed a (Zn,Al)S (AZS) high resistant transparent (HRT) layer at the transparent conductingoxide (TCO)/Cd(Zn)S emitter interface, to enable the higher annealing temperature of 440 ◦C to beemployed in the chlorine heat treatment (CHT) process. The AZS HRT remained intact with conformalcoverage over the TCO after performing the high CHT annealing, confirmed by cross-section scanningtransmission electron microscopy coupled with energy-dispersive X-ray spectroscopy (STEM-EDX)characterisation, which also revealed the Cd(Zn)S emitter layer having been consumed by theCdTe absorber via interdiffusion. The more aggressive CHT resulted in large CdTe grains. Thecombination of AZS HRT and aggressive CHT increased open circuit voltage (Voc) and improvedsolar cell performance.
Keywords: MOCVD; CdTe; photovoltaics; STEM-EDX
College: College of Engineering
Funders: Europe Regional Development Fund (ERDF) through the Welsh European Funding Office (WEFO) on the 2nd Solar Photovoltaic Academic Research Consortium (SPARC II) project, case number 81133, and the Engineering and Physical Sciences Research Council (EPSRC) funded project EP/W000555/1
Issue: 2
Start Page: 261