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Effect of Gold Nanoparticle Distribution in TiO2 on the Optical and Electrical Characteristics of Dye-Sensitized Solar Cells #MMPMID28853056
Nanoscale Res Lett 2017[]; 12 (ä): ä PMID28853056show ga
Photoanodes comprising Au nanoparticles (GNPs) and thin TiO2 layers with a stacked structure were fabricated by repeating the application of TiO2 paste and GNP solutions on conductive glass to vary the distribution of GNPs in the TiO2 layer. The plasmon-enhanced characteristics of dye-sensitized solar cells (DSSCs) with such photoanodes were investigated. Both the absorption of the TiO2 layer and the performance of the DSSC are found to be most increased by plasmonic enhancement when GNPs are concentrated near the position in the TiO2 layer, which is the penetration depth of the incident light of wavelength corresponding to the maximum absorption of the N719 dye (~?520 nm). When a GNP layer with a relatively high density of 1.3 ?g/cm2 density was formed at its position, and two GNP layers with a relatively low density of 0.65 ?g/cm2 were formed near the front side of the incident light, the short-circuit current density (Jsc) and energy conversion efficiency (?) of the DSSC were found to be 10.8 mA/cm2 and 5.0%, increases of 15 and 11%, respectively, compared with those of the DSSC without GNPs. Our work suggests that optimization of the distribution of GNPs in the TiO2 layer is very important for improving the performance of DSSCs fabricated by utilizing GNPs.Electronic supplementary material: The online version of this article (10.1186/s11671-017-2285-4) contains supplementary material, which is available to authorized users.