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| - Transient Electrical Response of Dye-Sensitized ZnO Nanorod Solar Cells
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| - A dye-sensitized solar cell was build with an electrode consisting of ZnO nanorods with a mean diameter of80 nm instead of the commonly used nano colloidal TiO2 substrate. The electrical response of the cell underexcitation with an alternating current (AC) voltage source was measured and analyzed in a wide frequencyrange (40 Hz−110 MHz). The results were compared to time-resolved measurements of the photocurrentgenerated by a nanosecond pulsed light source. Both measurements could be described by the same electricalequivalent circuit that consisted of passive circuit elements only. The slow response of the cell in the ms timerange is mainly caused by the large space charge capacitance of the ZnO nanorod electrode. Because of thelow impedance of the nanorod electrode, the photo response and the AC response is also influenced by theelectrical properties of other interfaces in the cell, such as the counterelectrode. Thus the signal is morecomplex than the single RC response usually observed for planar photo anodes. SPICE simulations of thephotocurrent response are given to illustrate the influence of the different interfaces on the overall signal.The differences observed in the electrical behavior of the Grätzel cell and the ZnO equivalent are discussed.
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