Abstract
A novel method was applied for the deposition of TiO 2 powders using Nano-Particle Deposition System (NPDS) for a dye-sensitized solar cell (DSSC). NPDS is a method used to deposit ceramic and metallic powders on substrates at room temperature by accelerating particles to subsonic speeds. In this study, TiO 2 powders were directly sprayed on transparent conductive oxide (TCO) glass at room temperature. TiO 2 powder deposition resolved problems common to conventional pastes of TiO 2 powders, such as crack formation and poor adhesion on substrates. Using this dry-coating method, the maximum light-conversion efficiency of the fabricated cell was 2.86% with a photocurrent density of 7.72 mA cm −2. The cell efficiency improved when the sealing-sheet thickness was 25 μm because the amount of electrolyte in the cell was optimized to prevent unnecessary recombination of electrons and holes. Therefore, sealing-sheet thickness is crucial in maximizing photovoltaic efficiency. Overall, this study proved that dry-coating of TiO 2 is possible for DSSC, and this method can also be applied on flexible substrates.
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