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We report the performance improvement Titanium Dioxide based solar cell, according to impedance measurements of the cells. The treatment of solar cells with NaOH has succeeded in increasing the performance of solar cells. The efficiency of solar cells increased to 1.34% and FF by 0.35 after NaOH was carried out after treatment. This increase occurs because of an increase in Na + ions, increased ionic conductivity of electrolytes. In addition, compilation of NaOH after treatment is carried out on a wide surface determined on the aluminum electrode. Increasing, this will increase contact between aluminum and electrolytes. The use of NaOH after treatment and deposition of Cu in TiO2 layers of solar cells was also able to reduce the resistance in solar cells from 4240 ohms before NaOH after treatment to 1550 ohms after NaOH after treatment. As a result, the performance of solar cells is increasing. These results indicate post-treatment NaOH can improve the performance of solar cells