Abstract
The photovoltaic performance of dye-sensitized solar cells consisting of mesoporous ZnO nanocolumnar films prepared at low temperatures by plasma enhanced chemical vapor deposition is studied. The results have been compared with those of randomly packed nanoparticulate electrodes prepared by doctor-blading a suspension of two mixed commercial nanopowders and subsequent high temperature annealing. The characterization of the devices consisted of dye loading and current–voltage curve measurements. The charge collection efficiency was probed by electrochemical impedance spectroscopy (EIS) under illumination, intensity modulated photovoltage spectroscopy (IMVS) and intensity modulated photocurrent spectroscopy (IMPS). It has been found that the nanoparticulate electrodes produce larger photocurrents as a consequence of better dye loading. However, the combined EIS/IMPS/IMVS study provides self-consistent evidence that transport properties are similar for both kinds of electrodes, approaching a 100% collection efficiency in both cases. The possibility of using ZnO nanostructures obtained by low-temperature processing methods for low-cost DSC is discussed.
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