Integration of Metallic Moth-Eye Nanostructures for Enhanced Photovoltaic Efficiency in All-Inorganic Perovskite Solar Cells

All-inorganic halide perovskite absorbers promise to revolutionize perovskite solar cells (PSCs). Utilizing the finite-difference time-domain methodology of the Lumerical suite, this study reports analysis and comparison of optical performances of all-inorganic halide PSCs comprising different metallic moth-eye nanostructures in the <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\text{CsPbI}_{3}$</tex> absorber with its planar counterpart. Our results reveal that incorporation of Ni moth-eye nanostructure facilitates superior light absorption, enhanced short circuit current density <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$(59.89\ \text{mA}/\text{cm}^{2})$</tex>, increased generation rate <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$(1.25\times 10^{28}\mathrm{m}^{-3}\mathrm{s}^{-1})$</tex>, which eventually results in a high ultimate efficiency of 32.26% for <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\text{ITO}/\text{TiO}_{2}/\text{CsPbI}_{3}/$</tex> Spiro OMeTAD / A1 PSCs. Notably, the integration of Ni moth-eye nanostructures yields better photovoltaic performance compared to other metals such as AI, Au, and Ag. This advancement underscores the potential of meticulous solar cell design to boost the efficacy of all-inorganic PSCs further.