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Keywords
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polymer, bulk heterojunction solar cells, plasmonic, nanoparticles , FDTD method
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Abstract
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The increase in optical absorption in organic solar cells based on poly (3-hexylthiophene): phenyl-C61-butyric acid methyl ester (P3HT:PC61BM), is examined in this study utilizing the finite difference time domain method and Lumerical software to evaluate field distribution and light absorption in the active layer in terms of wavelength. The plasmonic impact on the metal surface, as well as the positioning of plasmonic crystals in different areas, as revealed by finding a favorable site for a plasmonic crystal and refining the structure, results in a significant increase in absorption in the optical region. The impact of active layer thickness, the distance between neighboring nanoparticles, and plasmon crystal on the active layer of the polymer solar cell were examined. The proposed triangular, wire, rectangle, and multi-period triangular Ag nanoparticles optical model can explain the optical absorption increase via localized surface plasmon resonance (LSPR) modes and get a better knowledge of the shape characteristics of Ag nanoparticles, which are crucial in determining the broadband absorption phenomena in plasmonic organic solar cells. When the plasmonic solar cell's power conversion efficiency was compared to that of solar cells without Ag nanoparticles, a significant increase was seen. The strong alternating electromagnetic field around the different plasmonic nanoparticles resulting from the LSPR suggested by the Ag plasmonic nanocrystals increased the intrinsic optical absorption in the active layer P3HT:PC61BM. The short-circuit current varied from 7.3 to 26.9 mA/cm2 based on the photovoltaic characteristics.
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