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Broadband down-conversion for silicon solar cell by ZnSe/phosphor heterostructure

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Abstract

Down-conversion is a feasible way to improve conversion efficiency of silicon solar cell. However, the width of excitation band for down-converter based on trivalent lanthanide ions is still not satisfying. Here, we designed and fabricated a heterostructural down-converter composed of Y2O3: [(Tb3+-Yb3+), Li+] quantum cutting phosphor and ZnSe. The ZnSe phase was used to absorb the incident light with energy larger than its bandgap, and transfer the energy to Tb3+-Yb3+ quantum cutting couple. Short-wavelength incident light was finally converted into a strong Yb3+ emission at about 1000 nm, locating at the maximal spectral response of silicon solar cell. The excitation band of the down-conversion covers a wide region of 250-550 nm. Benefiting from the energy match between ZnSe bandgap and 7F65D4 absorption of Tb3+ ions, the bandwidth of down-conversion is almost maximized.

© 2014 Optical Society of America

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Figures (5)

Fig. 1
Fig. 1 Sketch of the down-conversion process design. Due to the energy match between ZnSe bandgap and 7F65D4 absorption of Tb3+ ions, the bandwidth of down-conversion is almost maximized.
Fig. 2
Fig. 2 Theta-2theta XRD pattern indicates that the heterostructural down-converter is composed of only ZnSe and Y2O3:[(Tb3+-Yb3+), Li+] phases . Inset: typical top-view SEM image of sample C, showing a plum-pudding-like morphology.
Fig. 3
Fig. 3 (A) PL and Excitation spectra of Yb3+ 2F5/22F7/2 emission in sample C. (B) Excitation spectra of Yb3+ NIR emission in the single Y2O3:[(Tb3+-Yb3+), Li+] phosphor (Tb:0.01, Yb:0.06) and the semiconductor(ZnS, ZnO, ZnSe)/phosphor(Tb:0.01, Yb:0.06) heterrostructures. (C) Excitation spectra of the ZnSe/phosphor heterostructures with different Tb and Yb fraction.
Fig. 4
Fig. 4 ET diagrams in the ZnSe/phosphor heterostructure.
Fig. 5
Fig. 5 (A) XRD pattern and photograph of the ZnSe/ Y2O3:[(Tb3+-Yb3+), Li+] double-layer thin films. Inset: a photograph of the double-layer film. (B) NIR PL spectrum of Yb3+, excited at 315 nm. (C) excitation spectra of Yb 975-nm emission of phosphor single-layer thin film and ZnSe/Y2O3:[(Tb3+-Yb3+), Li+] double-layer thin film. (D) The “corrected” excitation spectra of the above samples with considering the sunlight spectral distribution. The spectral distribution of sunlight is also shown here.
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