Abstract
The optical absorption of four square arrays of crystalline silicon nanostructures, i.e., circular nanowire array, circular nanohole arrays, square nanowire arrays, and square nanohole arrays, are numerically investigated. The method of rigorous coupled-wave analysis (RCWA) is employed to calculate the absorptivity for the arrays with lattice constant from 100nm to 1500nm. The results indicated that the lattice constant is the foremost structural parameter to determine the ultimate efficiency, and the peaks of ultimate efficiencies for the four different nanostructures always appear around the lattice constant of 600nm. It demonstrates that square nanowire arrays and circular nanohole arrays have great potentials for photovoltaic applications with high ultimate efficiencies and low filling ratios. Moreover, high ultimate efficiencies of all structures can be maintained over a large range of incident angles.
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