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In order to improve the P3HT/PCBM polymer photovoltaic devices, C70-PCBM ([6,6]-phenyl C71-butyric acid methyl ester) was employed instead of C60-PCBM ([6,6]-phenyl C61-butyric acid methyl ester). C70-PCBM showed significant increase of visible region light absorption to enhance the photocurrent. To optimize the device performance, we changed the device fabrication conditions such as atmosphere, solvents, post-annealing time, active layer materials composition, and thickness. The best power conversion efficiency of 4.7% was achieved under AM 1.5 G, 75 mA/cm2 condition. [ABSTRACT FROM AUTHOR]

Soluble thiophene-based copolymers, poly[(3-alkylthiophene)-co-(3-thiophene acetic acid)]s (P3AT-co-3TAA-n's), were synthesized to apply to the polymer sensitizer of the polymer-sensitized solar cell devices. In order to improve the solubility and the chemical adsorption onto nanoporous TiO2 layers in the polymer-sensitized solar cell devices, thiophene-based copolymers having the chemical structures of the carboxyl group and the alkyl group were designed. We have fabricated solid-state polymer-sensitized solar cell devices using polymer sensitizers and polymer electrolytes, and investigated on the photovoltaic performances. In the polymer-sensitized solar cell devices using polymer sensitizers, Voc is 0.37-0.46 V, Jsc is 0.82-7.71 mA/cm2, and the power conversion efficiency is 0.14-0.38%, respectively. [ABSTRACT FROM AUTHOR]

We investigated the electrical and optical properties of single-layered films of indium tin oxide (ITO) and aluminum-doped zinc oxide (AZO) as well as of double-layered ITO/AZO films. These transparent conducting oxide (TCO) films were deposited by sputtering. The ITO/AZO film (500/250 nm thick) had a transmittance slightly higher than that of the ITO film in the visible region, and exhibited slightly lower resistivity than that of the ITO film. These results suggested that photoelectric devices based on double-layered TCO films could be expected to exhibit higher photocurrents. To determine whether this was the case, we used the double-layered ITO/AZO film as the anode electrode in an organic photovoltaic (OPV) cell. The cell was found to exhibit better device performance than that of an OPV cell based on the single-layered ITO film. [ABSTRACT FROM AUTHOR]

In this paper, we fabricated and compared the photovoltaic properties of two different kinds of PEDOT:PSS buffer layer systems. The first was with the PEDOT:PSS buffer layers of different PEDOT to PSS ratios, 1 to 2.5 for Baytron P and 1 to 6 for Baytron PVP AI4083, respectively. The second system included the buffer layers with the same PEDOT to PSS ratio, but with the changed conductivities by doping with 2, 4, 6, 8, and 10 wt% of glycerol. The power conversion efficiency was governed by the series resistance of the device and the resistivity of the applied PEDOT:PSS films, while the parallel resistance and the diode rectification characteristics are affected by the ratio of PEDOT to PSS on buffer layer. [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]