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The surface destruction of the ZnO nanorod electrodes occurs in the dye-sensitization process, resulting in the extreme decreases of the short-circuit photocurrent density (JSC), compared to TiO2electrodes. To solve these problems, the TiO2nanolayer is coated on the ZnO nanorod electrodes using a titanium tetrachloride (TiCl4) assisted sonochemical process, which provides faster surface modification. The TiO2nanolayer can form new energy barrier on the ZnO nanorods, which can effectively inhibit the surface charge recombination and improve the energy conversion efficiency of the ZnO nanorod-based dye sensitized solar cells (DSSCs). [ABSTRACT FROM AUTHOR]

N,N'-Di(1-nonadecyl)perylene-3,4:9,10-bis(dicarboximide) (PDI-C9) based bulk-heterojunction photovoltaic devices increased the power conversion efficiency (PCE) with increasing PDI-C9 concentration and showed the highest incident photon-to-current conversion efficiency (IPCE) of 19% at 495 nm and PCE of 0.18% under AM 1.5 (100 mW/cm2) have been achieved with 1:4 ratio of P3HT: PDI-C9. 1,7-Bis(N-pyrrolidinyl)-N,N'-dicyclohexyl-3,4:9,10-perylenebis(dicarboximide) (5-PDI-DI) based devices showed best performance of 9% IPCE at 525 nm and 0.18% (AM 1.5) PCE at 1:1 blend ratio of P3HT: 5-PDI-DI and the PCEs were drastically decreased by increasing 5-PDI-DI ratio. [ABSTRACT FROM AUTHOR]

Room temperature ionic liquids have been used as electrolytes to investigate the performance and the characteristics in dye-sensitized solar cells (DSSCs). We focused on quasi-solid state electrolyte using ionic liquids, which are non-volatile liquids having relatively high conductivities. We studied the performance of the DSSC device with different anion or cation structures of ionic liquids. The power conversion efficiency of the DSSC device using [EMIm]+[PF6]- under 100 mA/cm2 is achieved up to 4.37%. [ABSTRACT FROM AUTHOR]