Metal doping into TiO2 photoanode of the perovskite-sensitized solar cell (PSSC) is a technique to increase its photosensitivity, electrical conductivity, lifetime and charge transport. It is also to reduce recombination of photogenerated electrons and holes. This study reports the use of potassium-doped TiO2 microtablet as a photoanode of PSSC. The effect of potassium content on the properties of K-doped TiO2 and the performance parameter on the device has been investigated. The X-ray diffraction studies reveal that the dominant anatase phase exists in the sample without the presence of potassium phase, signifying that it is successfully doped into TiO2. The morphology of the sample is microtablets, their size decreases with the concentration of K2PtCl4. The energy gap was found to increase with the doping content until its optimum content at 0.4 mM K2PtCl4. It is found that the photosensitivity of potassium-doped TiO2 increases with the increase of potassium precursor concentration and optimum at the concentration of 0.4 mM corresponding with the power conversion efficiency of 5.71%. This is due to the lowest energy gap and charge transfer resistance. This is also due to the longest carrier lifetime and carrier transport time.
- solar cells