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Novel non-radiative exciton harvesting scheme yields a 15% efficiency improvement in high-efficiency III-V solar cell

Novel non-radiative exciton harvesting scheme yields a 15% efficiency improvement in high-efficiency III-V solar cell
Novel non-radiative exciton harvesting scheme yields a 15% efficiency improvement in high-efficiency III-V solar cell
High-efficiency III–V solar cells typically incorporate an indirect wide-bandgap semiconductor as a passivation layer to limit surface recombination at higher photon energies. The poor extraction efficiency of the carriers photogenerated in this window layer limits the performance of the devices in the high-energy region of the spectrum. To address this problem, a resonance energy transfer (RET)-mediated luminescent down-shifting (LDS) layer is engineered by depositing an epilayer of colloidal quantum dots (QDs) on an InGaP solar cell. In this configuration, while the QDs act as a standard LDS layer, excitons are also funneled from the window layer to the QD epilayer using near-field RET. The luminescence energy of the QDs is tuned below the bandgap of the window layer and the emitted light is absorbed in the p–n junction, where carriers are generated and efficiently extracted. The overall performance of the solar cell is found to be significantly improved after hybridization, with a large 14.6% relative and 2% absolute enhancement of the photon conversion efficiency.
263-269
Brossard, Mael
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Hong, Chung-Yu
5920bb9e-2d01-4201-b536-cfa85f2bc859
Hung, Mumin
1cea7647-05c8-4ca5-8b5d-1e9e86ec4e3a
Yu, Peichen
7b4e5344-1a13-4bd7-9a5c-a70ad2cd26d1
Charlton, Martin
fcf86ab0-8f34-411a-b576-4f684e51e274
Savvidis, Pavlos G.
fef41541-a691-4df6-9ba6-2b86d3f85257
Lagoudakis, Pavlos G.
ea50c228-f006-4edf-8459-60015d961bbf
Brossard, Mael
9d2a5b1e-640c-4e5e-9a7f-5d808ddae0d2
Hong, Chung-Yu
5920bb9e-2d01-4201-b536-cfa85f2bc859
Hung, Mumin
1cea7647-05c8-4ca5-8b5d-1e9e86ec4e3a
Yu, Peichen
7b4e5344-1a13-4bd7-9a5c-a70ad2cd26d1
Charlton, Martin
fcf86ab0-8f34-411a-b576-4f684e51e274
Savvidis, Pavlos G.
fef41541-a691-4df6-9ba6-2b86d3f85257
Lagoudakis, Pavlos G.
ea50c228-f006-4edf-8459-60015d961bbf

Brossard, Mael, Hong, Chung-Yu, Hung, Mumin, Yu, Peichen, Charlton, Martin, Savvidis, Pavlos G. and Lagoudakis, Pavlos G. (2015) Novel non-radiative exciton harvesting scheme yields a 15% efficiency improvement in high-efficiency III-V solar cell. Advanced Optical Materials, 3 (2), 263-269. (doi:10.1002/adom.201400356).

Record type: Article

Abstract

High-efficiency III–V solar cells typically incorporate an indirect wide-bandgap semiconductor as a passivation layer to limit surface recombination at higher photon energies. The poor extraction efficiency of the carriers photogenerated in this window layer limits the performance of the devices in the high-energy region of the spectrum. To address this problem, a resonance energy transfer (RET)-mediated luminescent down-shifting (LDS) layer is engineered by depositing an epilayer of colloidal quantum dots (QDs) on an InGaP solar cell. In this configuration, while the QDs act as a standard LDS layer, excitons are also funneled from the window layer to the QD epilayer using near-field RET. The luminescence energy of the QDs is tuned below the bandgap of the window layer and the emitted light is absorbed in the p–n junction, where carriers are generated and efficiently extracted. The overall performance of the solar cell is found to be significantly improved after hybridization, with a large 14.6% relative and 2% absolute enhancement of the photon conversion efficiency.

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e-pub ahead of print date: 2 January 2015
Published date: February 2015
Organisations: Nanoelectronics and Nanotechnology

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Local EPrints ID: 402608
URI: https://eprints.soton.ac.uk/id/eprint/402608
PURE UUID: 53403c30-826c-4554-87a7-d66ea960fa6c

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Date deposited: 11 Nov 2016 15:26
Last modified: 16 Jul 2019 19:30

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