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In-depth analysis of chloride treatments for thin-film CdTe solar cells

In-depth analysis of chloride treatments for thin-film CdTe solar cells
In-depth analysis of chloride treatments for thin-film CdTe solar cells
CdTe thin-film solar cells are now the main industrially established alternative to silicon-based photovoltaics. These cells remain reliant on the so-called chloride activation step in order to achieve high conversion efficiencies. Here, by comparison of effective and ineffective chloride treatments, we show the main role of the chloride process to be the modification of grain boundaries through chlorine accumulation, which leads an increase in the carrier lifetime. It is also demonstrated that while improvements in fill factor and short circuit current may be achieved through use of the ineffective chlorides, or indeed simple air annealing, voltage improvement is linked directly to chlorine incorporation at the grain boundaries. This suggests that focus on improved or more controlled grain boundary treatments may provide a route to achieving higher cell voltages and thus efficiencies.
1-10
Major, J.D.
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Al Turkestani, M.
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Bowen, L.
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Brossard, M.
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Li, C.
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Lagoudakis, P.
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Pennycook, S.J.
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Phillips, L.J.
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Treharne, R.E.
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Durose, K.
1d8bb707-aa9b-45d2-8c77-6f18bb38f4f2
Major, J.D.
b01f8263-768f-418a-80df-1aa881d3e936
Al Turkestani, M.
83317e55-e247-4d4d-a9bd-ffbfeea978c3
Bowen, L.
0a0748a1-0413-448b-9ad1-eca0a330008f
Brossard, M.
0e36d99c-5900-4386-960b-d2aa88df7322
Li, C.
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Lagoudakis, P.
ea50c228-f006-4edf-8459-60015d961bbf
Pennycook, S.J.
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Phillips, L.J.
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Treharne, R.E.
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Durose, K.
1d8bb707-aa9b-45d2-8c77-6f18bb38f4f2

Major, J.D., Al Turkestani, M., Bowen, L., Brossard, M., Li, C., Lagoudakis, P., Pennycook, S.J., Phillips, L.J., Treharne, R.E. and Durose, K. (2016) In-depth analysis of chloride treatments for thin-film CdTe solar cells. Nature Communications, 7 (13231), 1-10. (doi:10.1038/ncomms13231).

Record type: Article

Abstract

CdTe thin-film solar cells are now the main industrially established alternative to silicon-based photovoltaics. These cells remain reliant on the so-called chloride activation step in order to achieve high conversion efficiencies. Here, by comparison of effective and ineffective chloride treatments, we show the main role of the chloride process to be the modification of grain boundaries through chlorine accumulation, which leads an increase in the carrier lifetime. It is also demonstrated that while improvements in fill factor and short circuit current may be achieved through use of the ineffective chlorides, or indeed simple air annealing, voltage improvement is linked directly to chlorine incorporation at the grain boundaries. This suggests that focus on improved or more controlled grain boundary treatments may provide a route to achieving higher cell voltages and thus efficiencies.

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More information

Accepted/In Press date: 14 September 2016
e-pub ahead of print date: 24 October 2016
Published date: 24 October 2016
Organisations: Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 402060
URI: http://eprints.soton.ac.uk/id/eprint/402060
PURE UUID: 96ed7cff-5aa7-4478-8f8d-3d0468f5b078

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Date deposited: 27 Oct 2016 10:12
Last modified: 16 Dec 2019 19:39

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