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Pyramidal surface textures for light trapping and antireflection in perovskite-on-silicon tandem solar cells

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Abstract

Perovskite-on-silicon tandem solar cells show potential to reach > 30% conversion efficiency, but require careful optical control. We introduce here an effective light-management scheme based on the established pyramidal texturing of crystalline silicon cells. Calculations show that conformal deposition of a thin film perovskite solar cell directly onto the textured front surface of a high efficiency silicon cell can yield front surface reflection losses as low as 0.52mA/cm2. Combining this with a wavelength-selective intermediate reflector between the cells additionally provides effective light-trapping in the high-bandgap top cell, resulting in calculated absolute efficiency gains of 2 – 4%. This approach provides a practical and effective method to adapt existing high efficiency silicon cell designs for use in tandem cells, with conversion efficiencies approaching 35%.

© 2014 Optical Society of America

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Energy yield analysis of textured perovskite silicon tandem solar cells and modules

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Figures (4)

Fig. 1
Fig. 1 (a) Wide-angle view of textured surface showing conformal deposition of layers in cross-section. (b) Three possible light paths for inverted pyramid texture [8]. (c) Schematic cross-section of internal optical structure: the intermediate reflector transmits low-energy light (red arrow) into the bottom c-Si cell, and reflects short wavelength light (indigo arrow) back into the top cell.
Fig. 2
Fig. 2 Reflectance and absorptance in the top and bottom cells for various cell structures vs. wavelength. All structures have a thickness-optimized SLARC and top cell thickness of 150nm. (a) Absorptance in top and bottom cells. (b) Front-surface reflectance and equivalent reflected Jsc values for each structure. A normalized AM1.5G solar spectrum is overlaid in gray for reference.
Fig. 3
Fig. 3 Jsc enhancement factor for each cell structure vs. top cell thickness. This factor is the ratio of the top cell Jsc of a given structure to the Jsc of the planar cell at equal top cell thickness
Fig. 4
Fig. 4 (a) Jsc for top and bottom cells for each structure vs. top cell thickness. (b) Efficiency of each structure vs. top cell thickness.
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