Abstract
The utilization of <em>Indigo tinctoria</em> as a DSSC sensitizer has been done to study the effect of <em>I. tinctoria</em>’s immersion time on DSSC efficiency. One of the most essential components in DSSC is a sensitizer or dye. In this work, the dye has been used in DSSC is the natural indigo dye from <em>I. tinctoria</em> leaves. The extraction was done by dissolving 50 grams of <em>I. tinctoria</em> leaves in 500 mililiters aquades and soaking in various time: 12, 24, 36, and 48 hours. The optical properties of dye solution was characterized by UV-Vis spectrophotometer and the current-voltage of DSSC was characterized by Keithley I-V Meter. The highest absorbance is 2.7 of 48h dye solution, but the best efficiency of DSSC is 5.39 x 10<sup>-3 </sup>% that owned 24 h cell.
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