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Efficient light harvesting in hybrid quantum dot-interdigitated back contact solar cells via resonant energy transfer and luminescent downshifting

Efficient light harvesting in hybrid quantum dot-interdigitated back contact solar cells via resonant energy transfer and luminescent downshifting
Efficient light harvesting in hybrid quantum dot-interdigitated back contact solar cells via resonant energy transfer and luminescent downshifting
In this paper, we propose a hybrid quantum dot (QD)/solar cell configuration to improve performance of interdigitated back contact (IBC) silicon solar cells, resulting in 39.5% relative boost in the short-circuit current (JSC) through efficient utilisation of resonant energy transfer (RET) and luminescent downshifting (LDS). A uniform layer of CdSe1−xSx/ZnS quantum dots is deposited onto the AlOx surface passivation layer of the IBC solar cell. QD hybridization is found to cause a broadband improvement in the solar cell external quantum efficiency. Enhancement over the QD absorption wavelength range is shown to result from LDS. This is confirmed by significant boosts in the solar cell internal quantum efficiency (IQE) due to the presence of QDs. Enhancement over the red and near-infrared spectral range is shown to result from the anti-reflection properties of the QD layer coating. A study on the effect of QD layer thickness on solar cell performance was performed and an optimised QD layer thickness was determined. Time-resolved photoluminescence (TRPL) spectroscopy was used to investigate the photoluminescence dynamics of the QD layer as a function of AlOx spacer layer thickness. RET can be evoked between the QD and Si layers for very thin AlOx spacer layers, with RET efficiencies of up to 15%. In the conventional LDS architecture, down-converters are deposited on the surface of an optimised anti-reflection layer, providing relatively narrowband enhancement, whereas the QDs in our hybrid architecture provide optical enhancement over the broadband wavelength range, by simultaneously utilising LDS, RET-mediated carrier injection, and antireflection effects, resulting in up to 40% improvement in the power conversion efficiency (PCE). Low-cost synthesis of QDs and simple device integration provide a cost-effective solution for boosting solar cell performance.
2040-3364
18837-18844
Krishnan, Chirenjeevi
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Mercier, Thomas
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Rahman, Tasmiat
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Piana, Giacomo
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Brossard, Mael
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Yagafarov, Timur
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To, Alexander
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Pollard, Michael E.
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Shaw, Peter
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Bagnall, Darren M.
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Hoex, Bram
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Boden, Stuart A.
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Lagoudakis, Pavlos G.
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Charlton, Martin D. B.
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Shaw, Peter
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Shaw, Peter
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Krishnan, Chirenjeevi
0d41ebc9-118a-4f89-889e-8ad28a69237e
Mercier, Thomas
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Rahman, Tasmiat
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Piana, Giacomo
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Brossard, Mael
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Yagafarov, Timur
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To, Alexander
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Pollard, Michael E.
c439d195-6e7c-48d7-ab81-a20c72b72632
Shaw, Peter
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Bagnall, Darren M.
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Hoex, Bram
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Boden, Stuart A.
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Lagoudakis, Pavlos G.
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Charlton, Martin D. B.
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Shaw, Peter
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Shaw, Peter
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Krishnan, Chirenjeevi, Mercier, Thomas, Rahman, Tasmiat, Piana, Giacomo, Brossard, Mael, Yagafarov, Timur, To, Alexander, Pollard, Michael E., Shaw, Peter, Bagnall, Darren M., Hoex, Bram, Boden, Stuart A., Lagoudakis, Pavlos G., Charlton, Martin D. B., Shaw, Peter and Shaw, Peter (2019) Efficient light harvesting in hybrid quantum dot-interdigitated back contact solar cells via resonant energy transfer and luminescent downshifting. Nanoscale, 11 (40), 18837-18844. (doi:10.1039/c9nr04003j).

Record type: Article

Abstract

In this paper, we propose a hybrid quantum dot (QD)/solar cell configuration to improve performance of interdigitated back contact (IBC) silicon solar cells, resulting in 39.5% relative boost in the short-circuit current (JSC) through efficient utilisation of resonant energy transfer (RET) and luminescent downshifting (LDS). A uniform layer of CdSe1−xSx/ZnS quantum dots is deposited onto the AlOx surface passivation layer of the IBC solar cell. QD hybridization is found to cause a broadband improvement in the solar cell external quantum efficiency. Enhancement over the QD absorption wavelength range is shown to result from LDS. This is confirmed by significant boosts in the solar cell internal quantum efficiency (IQE) due to the presence of QDs. Enhancement over the red and near-infrared spectral range is shown to result from the anti-reflection properties of the QD layer coating. A study on the effect of QD layer thickness on solar cell performance was performed and an optimised QD layer thickness was determined. Time-resolved photoluminescence (TRPL) spectroscopy was used to investigate the photoluminescence dynamics of the QD layer as a function of AlOx spacer layer thickness. RET can be evoked between the QD and Si layers for very thin AlOx spacer layers, with RET efficiencies of up to 15%. In the conventional LDS architecture, down-converters are deposited on the surface of an optimised anti-reflection layer, providing relatively narrowband enhancement, whereas the QDs in our hybrid architecture provide optical enhancement over the broadband wavelength range, by simultaneously utilising LDS, RET-mediated carrier injection, and antireflection effects, resulting in up to 40% improvement in the power conversion efficiency (PCE). Low-cost synthesis of QDs and simple device integration provide a cost-effective solution for boosting solar cell performance.

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More information

Accepted/In Press date: 17 August 2019
e-pub ahead of print date: 9 October 2019
Published date: 28 October 2019

Identifiers

Local EPrints ID: 448851
URI: http://eprints.soton.ac.uk/id/eprint/448851
ISSN: 2040-3364
PURE UUID: e0beca5e-50ed-4209-a4dd-398be2fe2df4
ORCID for Peter Shaw: ORCID iD orcid.org/0000-0003-0925-5010
ORCID for Pavlos G. Lagoudakis: ORCID iD orcid.org/0000-0002-3557-5299
ORCID for Peter Shaw: ORCID iD orcid.org/0000-0003-0925-5010
ORCID for Peter Shaw: ORCID iD orcid.org/0000-0001-9044-1069

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Date deposited: 06 May 2021 16:34
Last modified: 23 Sep 2021 02:50

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Contributors

Author: Chirenjeevi Krishnan
Author: Thomas Mercier
Author: Tasmiat Rahman
Author: Giacomo Piana
Author: Mael Brossard
Author: Timur Yagafarov
Author: Alexander To
Author: Michael E. Pollard
Author: Peter Shaw ORCID iD
Author: Darren M. Bagnall
Author: Bram Hoex
Author: Stuart A. Boden
Author: Martin D. B. Charlton
Author: Peter Shaw ORCID iD
Author: Peter Shaw ORCID iD

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