Cooperative plasmon enhanced organic solar cells with thermal coevaporated Au and Ag nanoparticles |
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Affiliation: | 1. Laboratory for Thin Films-Nanosystems and Nanometrology (LTFN), Physics Department, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece;2. School of Science and Technology, Nottingham Trent University, NG11 8NS Nottingham, United Kingdom;3. Aristotle University of Thessaloniki, Physics Department, GR-54124 Thessaloniki, Greece;4. University of Ioannina, Department of Materials Science and Engineering, GR-45110 Ioannina, Greece |
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Abstract: | Cooperative plasmon enhanced small molecule organic solar cells are demonstrated based on thermal coevaporated Au and Ag nanoparticles (NPs). The optimized device with an appropriate molar ratio of Au:Ag NPs shows a power conversion efficiency of 3.32%, which is 22.5% higher than that of the reference device without any NPs. The improvement is mainly contributed to the increased short-circuit current which resulted from the enhanced light harvesting due to localized surface plasmon resonance of Au:Ag NPs and the increased conductivity of the device. Besides, factors that determining the performance of the Au:Ag NPs cooperative plasmon enhance organic solar cells are investigated, and it finds that the thickness of MoO3 buffer layer plays a crucial role. Owing to the different diameter of the thermal evaporated Au and Ag NPs, a suitable MoO3 buffer layer is required to afford a large electromagnetic enhancement and to avoid significant exciton quenching by the NPs. |
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Keywords: | Organic solar cell Small molecule Localized surface plasmon resonance Au:Ag nanoparticle |
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