Abstract
Au nanoparticles dispersion liquid and the pokeweed pigment solution respectively showed the maximum absorption wavelength at visible region by UV-vis absorption spectrum. The conversion efficiency of DSSC which was assembled with Au+TiO2 film and TiO2 film was respectively 0.0529 % and 0.0167 %. The difference in this conversion efficiency depends on magnitude relation of the short circuit photocurrent density. Charge transfer resistance decreases by adding the Au nanoparticles which are a metal to TiO2 which is a semiconductor, and it is thought that short circuit photocurrent density increased. In addition, it is thought that this is because the excitation of the pigment became easy to happen by reinforced light electric field occurred by the plasmon absorption of metal nanoparticles. The improvement of the conversion efficiency was confirmed, but performance is largely low in comparison with general DSSC. Using ac impedance measurement, the resistance ingredient in the cell is identified.
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