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Spectrally Matched Quantum Dot Photoluminescence in GaAs-Si Tandem Luminescent Solar Concentrators

Needell, David R. and Bukowsky, Colton R. and Darbe, Sunita and Bauser, Haley and Ilic, Ognjen and Atwater, Harry A. (2019) Spectrally Matched Quantum Dot Photoluminescence in GaAs-Si Tandem Luminescent Solar Concentrators. IEEE Journal of Photovoltaics, 9 (2). pp. 397-401. ISSN 2156-3381. doi:10.1109/jphotov.2019.2892075.

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Luminescent solar concentrators (LSCs) can capture both direct and diffuse irradiance via isotropic absorption of waveguide-embedded luminophores. Additionally, LSCs have the potential to reduce the overall cost of a photovoltaic (PV) module by concentrating incident irradiance onto an array of smaller cells. Historically, LSC efficiencies have suffered in part from incomplete light absorption and non-unity quantum yield (QY) of the luminophores. Inorganic quantum dot (QD) luminophores allow the spectral tuning of the absorption and photoluminescence bands, and have near-unity QYs. In a four-terminal tandem LSC module scheme, visible light is trapped within the LSC waveguide and is converted by GaAs cells, and near infrared light is optically coupled to a Si subcell. Here, we investigate the efficiency of a GaAs/Si tandem LSC as a function of luminophore absorption edge and emission wavelength for QD luminophores dispersed in an LSC waveguide with embedded, coplanar GaAs cells. We find that positioning the luminophore absorption edge at 660 nm yields a maximum module power efficiency of approximately 26%, compared with 21% for the non-optimized luminophore and 19% for the bare Si cases.

Item Type:Article
Related URLs:
URLURL TypeDescription
Needell, David R.0000-0001-8343-5883
Bukowsky, Colton R.0000-0003-3577-8050
Darbe, Sunita0000-0002-8099-1814
Bauser, Haley0000-0002-9677-3301
Atwater, Harry A.0000-0001-9435-0201
Additional Information:© 2019 IEEE. Manuscript received September 18, 2018; revised December 1, 2018; accepted December 20, 2018. Date of publication January 22, 2019; date of current version February 18, 2019. This work was supported in part by the Advanced Research Projects Agency under Energy (ARPA-E) under Award DE-AR0000627 and in part by the Office of Energy Efficiency and Renewable Energy (EERE) under Award EEC-1041895.
Funding AgencyGrant Number
Department of Energy (DOE)DE-AR0000627
Subject Keywords:III-V and concentrator photovoltaic (PV), luminescent devices, Monte Carlo methods, quantum dots (QDs), tandem PV
Issue or Number:2
Record Number:CaltechAUTHORS:20190201-135634651
Persistent URL:
Official Citation:D. R. Needell, C. R. Bukowsky, S. Darbe, H. Bauser, O. Ilic and H. A. Atwater, "Spectrally Matched Quantum Dot Photoluminescence in GaAs-Si Tandem Luminescent Solar Concentrators," in IEEE Journal of Photovoltaics, vol. 9, no. 2, pp. 397-401, March 2019. doi: 10.1109/JPHOTOV.2019.2892075
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92577
Deposited By: George Porter
Deposited On:01 Feb 2019 22:42
Last Modified:16 Nov 2021 03:51

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