Determination of the Optical Band gap Energy from the Extraction and Evaporation of Anthocyanin Compound Sea Lettuce (Ulva Lactuca L.) Using Tauc Plot Method

The optical energy gap of anthocyanin compounds from sea lettuce extract (Ulva lactuca L.) has been calculated using the Tauc plot method. Sea plants taken at Sanur Beach Bali. was dried then mashed and extracted for 24 hours, last being macerated through three cycles. extraction results are evaporated to obtain a thick solution. Extracted evaporated-extraction samples were characterized by UV-Vis in wavelength range 200-800 nm. From characterization results, it found that absorption 268 412 Meanwhile, extraction-evaporation sample, is 286.5 408 By method, values ??for extraction-evaporated 2.69 2.54 eV, respectively. Therefore, both evaporation-extracted qualify as dye sensitized solar cells (DSSC) TiO2 semiconductors.