Luminescent down-shifting for CdTe solar cells: A review of dyes and simulation of performance

The luminescent materials that have been used for luminescent down-shifting (LDS) range from organic molecules and organometallic complexes to quantum dots (QDs), each of them with certain strengths and weaknesses. In this work, we introduce five figures of merit to quantitatively evaluate how the properties of these materials compare with the desirable properties of an optimum LDS layer, focusing our attention in the cadmium sulfide/cadmium telluride (CdS/CdTe) PV technology. In order to elaborate a quantitative ranking with the candidate materials, we have used a ray-tracing simulation software to calculate the expected enhancement in a CdTe module conversion efficiency. Finally, we briefly discuss the issues that directly affect the industrial application of these dyes for LDS, such as the amount of material required, its cost and its stability under the sunlight.

[1]  Nick E. Powell,et al.  An optical comparison of silicone and EVA encapsulants under various spectra , 2010, 2010 35th IEEE Photovoltaic Specialists Conference.

[2]  B. Richards,et al.  Measurement method for photoluminescent quantum yields of fluorescent organic dyes in polymethyl methacrylate for luminescent solar concentrators. , 2009, Applied optics.

[3]  B. Richards,et al.  Enhancing the performance of solar cells via luminescent down-shifting of the incident spectrum: A review , 2009 .

[4]  S. L. Bondarev,et al.  Fluorescence and Electronic Structure of the Laser Dye DCM in Solutions and in Polymethylmethacrylate , 2004 .

[5]  Sheldon T. Bailey,et al.  Photo-stability and performance of CdSe/ZnS quantum dots in luminescent solar concentrators , 2009 .

[6]  S. Zakeeruddin,et al.  Controlling phosphorescence color and quantum yields in cationic iridium complexes: a combined experimental and theoretical study. , 2007, Inorganic chemistry.

[7]  Anita C Jones,et al.  Europium complexes with high total photoluminescence quantum yields in solution and in PMMA. , 2009, Chemical communications.

[8]  Bryce S. Richards,et al.  Increase in short-wavelength response of encapsulated CIGS devices by doping the encapsulation layer with luminescent material , 2012 .

[9]  R. Hodgson,et al.  The effect of fluorescent wavelength shifting on solar cell spectral response , 1979 .

[10]  T. Maruyama,et al.  Transformations of the wavelength of the light incident upon solar cells , 2001 .

[11]  J. Sites,et al.  Quantification of losses in thin-film CdS/CdTe solar cells , 2005, Conference Record of the Thirty-first IEEE Photovoltaic Specialists Conference, 2005..

[12]  T. Maruyama,et al.  Transformations of the wavelength of the light incident upon CdS/CdTe solar cells , 2001 .