Bulk heterojunction cells P3HT:PCBM blends

Nevertheless, it was recently demonstrated that introduction of thin (5 nm) interlayer of PF-PO(Et)2 (Figure 74) improves the performance of the conventional P3HT/ [60JPCBM blend from 2.0 to 3.4% mainly due to increase in the open-circuit voltage and FF from 450 to 640 mV and from 51 to 59%, respectively.Another polymer abbreviated as PFNBr-PFMEE in Figure 74 improved the power conversion efficiency of P3HT/[60]PCBM bulk heterojunction solar cells from 3.0 to 3.8%. The open-circuit... 

The improvement in power conversion efficiency (PCE) of plasmonic solar cells is always an urgent problem and short circuit current density is one of the key factors for the PCE. The improvement in the Jsc of plasmonic solar cells is mainly achieved by the introduction of metallic nanoparticles, such as blending Au nanoparticles into the anodic buffer layer or the interconnecting layer that connects two subcells of the tandem plasmonic solar cells [86]. Compared with the metallic NPs, nanowires (NWs) are superior in terms of improving photocurrent, while most of the metallic NWs introducing in cells reported previously were used for the anodic contact of the cells [87]. The improvement of PCE in bulk heterojunction polymer solar cells with active layer P3HT PCBM by introducing 40 nm Au nanoparticles between ITO and PEDOT PSS layer with various concentrations is also observed by Gao et al. [88]. It has been found that both short-circuit current density and PCE increase from 3.50% to 3.81% with 0.9 wt. % Au NPs due to the localized surface plasmon excitation of Au NPs. 

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