Abstract
The photon absorption enhancement of thin organic solar cells with periodic three-dimensional (3D) metal structures in a photoactive medium is theoretically investigated in this study. The suggested metal structures have a match form, a gold sphere on a thin cylindrical post. With a finite difference time method tool, the optimized sizes and positions of the metal structure are obtained in the scattered radiation pattern of the incident light, and the photon absorption spectra are calculated and analyzed. The organic solar cell equipped with the 3D metal structures shows approximately a 10% enhanced photon absorption compared to the value obtained by same solar cells without the 3D metal structures. The reason for the enhanced absorption can be understood based on the electric field distributions and is attributed to the fact that the 3D metal structure can lead to improved absorption at long wavelengths region where almost negligible absorption occurs in the same solar cells without the metal structures.
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