Abstract
Unlike TiO2‐based dye‐sensitized solar cells (DSSCs) where improvements in the efficiency with TiCl4 treatments are well established, there are no known treatments to improve the efficiency of ZnO‐based DSSCs. Here we investigated treatments (solution‐based, followed by annealing) with different ZnO precursors (zinc acetate, zinc chloride, and zinc nitrate) on the properties of ZnO porous film and on the ZnO‐based DSSC performance. While zinc chloride and zinc acetate treatments do not improve DSSC performance, zinc nitrate treatment results in increased orange‐red defect emission of ZnO electrode, significant difference in the impedance characteristics, and improved photovoltaic performance from 2.07% to 2.35% with ∼12% increase in power conversion efficiency compared to untreated cells.
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