Abstract
This study attempts to enhance broadband absorption in advanced plasmonic circular nanostructures (PCN). Experimental results indicate that the concentric circular metallic gratings can enhance broadband optical absorption, due to the structure geometry and the excitation of surface plasmon mode. The interaction between plasmonic enhancement and the absorption characteristics of the organic materials (P3HT:PCBM and PEDOT:PSS) are also examined. According to those results, the organic material's overall optical absorption can be significantly enhanced by up to~51% over that of a planar device. Additionally, organic materials are enhanced to a maximum of 65% for PCN grating pitch = 800 nm. As a result of the PCN's enhancement in optical absorption, incorporation of the PCN into P3HT:PCBM-based organic solar cells (OSCs) significantly improved the performance of the solar cells: short-circuit current increased from 10.125 to 12.249 and power conversion efficiency from 3.2% to 4.99%. Furthermore, optimizing the OSCs architectures further improves the performance of the absorption and PCE enhancement.
Highlights
Recent studies have demonstrated the feasibility of designing metallic nanostructures to increase optical absorption in solar cells by excitation of surface plasmon polaritons (SPPs) mode [1,2,3,4,5]
For the excitation of SPPs, a previous study used circular grating structures, which alter the light momentum to achieve phase matching condition [17]. This structure has received a significant amount of interest for several applications, including the enhancement of transmitted light [18], plasmonic lens [19, 20], distributed feedback (DFB) lasers [21], and plasmonic antennas [22, 23]
This study describes the enhancement of broadband absorption in advanced plasmonic circular nanostructures (PCN)
Summary
Recent studies have demonstrated the feasibility of designing metallic nanostructures to increase optical absorption in solar cells by excitation of surface plasmon polaritons (SPPs) mode [1,2,3,4,5]. For the excitation of SPPs, a previous study used circular grating structures, which alter the light momentum to achieve phase matching condition [17]. This structure has received a significant amount of interest for several applications, including the enhancement of transmitted light [18], plasmonic lens [19, 20], distributed feedback (DFB) lasers [21], and plasmonic antennas [22, 23]. The organic solar cells (OSCs) performance properties are investigated with respect to interaction between periodic PCN structure with organic materials, revealing an enhancement of broadband absorption and power conversion efficiency
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