To achieve optimal optical performance and minimal reflection losses, a textured interface between perovskite and silicon sub-cells in perovskite-silicon tandem solar cells is needed. However, the perovskite solar cells fabrication method yielding the highest efficiencies, spin coating, is not compatible with the conventional random micro-pyramidal texture on silicon. This study focuses on creating periodic inverted micro-pyramidal textures in silicon through photolithography, reactive ion etching, and wet-chemical etching, enabling the deposition of fully textured perovskite solar cells with low reflectance on the textured silicon via spin-coating. This breakthrough lays the foundation for the fabrication of optically and electronically optimized perovskite-silicon tandem solar cells.
Optical simulations of perovskite/silicon tandem solar cells show that nanotexturing both sides of the perovskite top cell yields the strongest antireflective effect. Cells with an intermediate texture in-between the perovskite and silicon sub cells perform comparably to configurations with a fully planar top cell. However, in experiment intermediate-textured solar cells perform slightly better than their planar counterparts. A numerical sensitivity analysis shows that this can be attributed to the thickness of a silicon oxide layer in-between the two sub cells: this thickness affects the optics for a fully planar top cell, but does not affect the performance for intermediate texturing.
KEYWORDS: Tandem solar cells, Perovskite, Optical simulations, Solar cells, Silicon, Oxides, Optics manufacturing, Silicon solar cells, Optimization (mathematics), Multijunction solar cells
Optical simulations of perovskite/silicon tandem solar cells show that nanotexturing both sides of the perovskite top cell yields the strongest antireflective effect. Cells with an intermediate texture in-between the perovskite and silicon sub cells perform comparably to configurations with a fully planar top cell. However, in experiment intermediate-textured solar cells perform slightly better than their planar counterparts. A numerical sensitivity analysis shows that this can be attributed to the thickness of a silicon oxide layer in-between the two sub cells: this thickness affects the optics for a fully planar top cell, but does not affect the performance for intermediate texturing.
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