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Renewable energy, especially solar energy is a vital alternative solution to power challenge in these present times. More recently, dye-sensitized solar cells (DSSC) play an important role in solar power generation. The performance of DSSC can be increased by adding more cells to a cell stack in a Tandem cell with a separate band gap. A double-layer structured DSSC was analyzed in this study in which ZnO and TiO 2 composite photo-anodes were prepared on Fluorine-doped tin oxide. Photovoltaic properties such as current–voltage (IV) and photocurrent density–voltage curves were investigated for different thickness, absorption coefficients, and wavelengths. DSSC solar cell characterization technique such as IV measurement was analyzed to evaluate the cells performance. The experimental results show an approximate increase in current of 0.02 A causing the IV characteristics to change significantly when …