Procedure to decouple reflectance and down-shifting effects in luminescent down-shifting enhanced photovoltaics

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DOIResolve DOI: http://doi.org/10.1364/OE.25.00A530
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TypeArticle
Journal titleOptics Express
ISSN1094-4087
Volume25
Issue12
PagesA530A538
AbstractThe down-shifting (DS) process is a purely optical approach used to improve the short-wavelength response of a solar cell by shifting high-energy photons to the visible range, which can be more efficiently absorbed by the solar cell. In addition to the DS effect, coupling a DS layer to the top surface of a solar cell results in a change in surface reflectance. The two effects are intermixed and therefore, usually reported as a single effect. Here we propose a procedure to decouple the two effects. Analytical equations are derived to decouple the two effects, that consider the experimentally measured quantum efficiency of the solar cell with and without the DS layer, in addition to transfer matrix simulations of the parasitic absorption in the device structure. In this work, an overall degradation of 0.46 mA/cm2 is observed when adding a DS layer composed of silicon nanocrystals embedded in a quartz matrix to a silicon solar cell of 11% baseline efficiency. To fully understand the contribution from each effect, the surface reflectance and DS effects are decoupled and quantified using the described procedure. We observe an enhancement of 0.27 mA/cm2 in short-circuit current density due to the DS effect, while the surface reflectance effect leads to a degradation of 0.73 mA/cm2 in short-circuit current density.
Publication date
PublisherOptical Society of America
LanguageEnglish
AffiliationNational Research Council Canada; Information and Communication Technologies
Peer reviewedYes
NPARC number23002239
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Record identifierb61b8697-879c-41ed-a72d-d183ad0b44f6
Record created2017-09-13
Record modified2017-09-13
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