Optimized integration of shape-tailored metallic nanostructures for performance enhancement in all-inorganic perovskite solar cells

– All-inorganic halide perovskite absorbers promise to revolutionize perovskite solar cells (PSCs). Utilizing the three dimensional (3-D) finite-difference time-domain and charge methodology of the Lumerical suite, this study reports analysis and comparison of optical performances of all-inorganic halide PSCs comprising three different metallic nanostructures: moth-eye, cylindrical pillar, and pyramidal in the CsPbI₃ absorber, along with its planar counterpart. Our results reveal that the integration of Ni nanostructures yields better photovoltaic performance compared to other metals such as Al, Au, and Ag. Moreover, among different nanostructures, the incorporation of pyramidal nanostructures of Ni facilitates superior light absorption, enhanced short circuit current density, increased carrier generation rate which eventually results in a high ultimate efficiency of 32.80 % and excellent PCE of 23.32 % for ITO/TiO₂/CsPbI₃/Spiro-OMeTAD/Al PSCs. This advancement emphasizes the role of precise solar cell design in enhancing all-inorganic PSC efficiency.