Abstract
One-dimensional zinc oxide (ZnO) nanostructures have a strong impact on dye sensitized solar cells (DSSCs) as a photoanode. Such a nanostructure offers a direct route to the anode for photo-generated electrons resulting from the increased carrier recombination resistance. This manuscript is concerned with the formation of different aspect ratio ZnO nanorod (8–20) by a simple hydrothermal method and the use of such nanorods into the photoanode. The carboxy-functionalized multiwalled carbon nanotubes (COOH-MWCNT) immobilized into gelatin hydrogel was taken as the gel electrolyte. At an optimum concentration of 0.2 % MWCNT, the fabricated device shows an open circuit voltage (Voc) of 0.934 V, short circuit current density (Jsc) of 8.143 mA/cm2 and power conversion efficiency (PCE) of 1.35 % for ZnO nanorods with aspect ratio 20. On the other hand, the conventional ZnO shows only Voc of 0.743 V, Jsc of 5.525 mA/cm2 and PCE of 0.21 % under identical condition. This novel fabrication method can thus be considered as a simple and improved way to well-defined photoanodes for quasi solid state DSSCs.
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