Abstract
Concentration depth profiles of the ruthenium based dyes Z907 and N719 adsorbed onto titania are measured directly and used for determining the adsorption isotherm of the dyes. Dye layers formed by both grow in islands on the titania which do not cover the entire titania surface even at the maximum coverage. Impedance spectroscopy in conjunction with the adsorption isotherms shows that recombination losses mainly appear between the dye and the electrolyte solution. The short circuit current and the efficiency increase linearly with the dye coverage. The open circuit voltage slightly increases with increasing dye coverage which is interpreted as most likely to be a consequence of the higher charge in the particles upon higher dye loading on the TiO2 surface.
Highlights
From the perspective of global usage of finite fossil energy resources and the anthropogenic perturbation of the atmospheric as well as hydrospheric carbon dioxide balance alternative sources of energy are urgently required
Working electrodes with dye surface coverage levels of 5%, 25%, 50% and 100% were manufactured for both the N719 and the Z907 dye and assembled into fully operating dye-sensitized solar cells
It is noted that dye-sensitized solar cell (DSC) containing the two different sensitizing organometallic dyes N719 and Z907 display very similar photovoltaic performance in spite of the fact that they exhibit rather different organization patterns
Summary
From the perspective of global usage of finite fossil energy resources and the anthropogenic perturbation of the atmospheric as well as hydrospheric carbon dioxide balance alternative sources of energy are urgently required. The difference from other types of electrochemical cells, such as a battery, is that (at least) one of the electrodes is made photosensitive, allowing the conversion of light into energy-rich electrons, photoelectrons. This makes the photoelectrode the most essential component of the DSC, and it is no surprise that the main focus in research and patent activities concerns the photoelectrode. The overall light-to-electricity conversion efficiency (Z), fill factor (FF), open-circuit voltage (Voc), and short-circuit current density ( Jsc) were obtained through the current–voltage characteristics of a solar cell at room temperature These characteristics and I–V diagrams were monitored and recorded using a computerized Keithley model 2400 source unit
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