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2 May 2012 Efficiency enhancement of ITO-free organic polymeric solar cells by light trapping
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We report an optimized inverted bulk-heterojunction (P3HT:PCBM) organic solar cell geometry in order to both efficiently trap incident light within in the cell (increasing light absorption) and at the same time provide efficient transport of the generated carriers to the electrodes (reducing the active layer thicknesses). To address these issues, we have used two approaches. The first one consists of including diffraction gratings that increase the light path length in the cell and thus enhance absorption in wavelength intervals matching the absorption peak of the organic active layer on the bottomelectrode, while the second approach includes Ag nanoparticles embedded on the solar cell topelectrode, which scatter the incident light into the solar cell active layer. The solar cells containing either gratings or nanoparticles exhibit a significant enhancement on the power conversion efficiency. Furthermore, the solar cells do not contain the rare metal indium, but employ a PEDOT:PSS based transparent electrode.
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Roana Melina de Oliveira Hansen, Manuela Schiek, Yinghui Liu, Morten Madsen, and Horst-Günter Rubahn "Efficiency enhancement of ITO-free organic polymeric solar cells by light trapping", Proc. SPIE 8438, Photonics for Solar Energy Systems IV, 843813 (2 May 2012);

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