Silicon Microwire Arrays with Nanoscale Spacing for Radial Junction c-Si Solar Cells with an Efficiency of 20.5%

Structural optimization of microwire arrays is important for the successful demonstration practical feasibility radial junction crystalline silicon (c-Si) solar cells. In this study, we investigated an optimized design tapered (TMW) to maximize light absorption c-Si cells, while minimizing surface recombination, simultaneously improving open-circuit voltage and short-circuit current density (Jsc). Finite-difference time-domain simulations confirmed that controlling spacing between TMWs at nanometer scale more effective increasing than TMW length. The photogenerated a array with 200 nm was calculated be 42.90 mA/cm2, which close theoretical limit 43.37 mA/cm2 in 300–1100 wavelength range. To experimentally demonstrate nanometer-scale nm, cannot realized by conventional photolithography, utilized soft lithography method based on polystyrene beads patterning wafer. cells exhibited Jsc 42.5 power conversion efficiency 20.5%, exceed those previously reported microwire-based