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Suyitno, et al. /International Energy Journal 18 (2018) 53 β 60 55 spectra at 400-520 nm indicate the possibility of the presence of more than one isomeric form at the ground state of curcumin-dyes [21]; [22]. Figure 2 shows also the light and heat subjected to the DSSCs can shift the absorption peak into bathochromic as the light exposure time and heat treatment time increase. Absorption peak occurs at a wavelength of 540 nm after 200 hours of heat and light exposure treatment. The shift of absorption band was known to be caused by the changing of auxochrome rather than by solvent. Particularly the treatment leads the absorbance band shifts to bathochromic and the absorbance peak increases indicates the growth of new auxochrome. This is indicated by the color of dye changes into brownish. The power emitted by light was the product of the intensity of incident light (πΊ) at 1000 W/m2 and the active area of DSSC [20]. The efficiency of DSSCs was calculated by the following equation: π=π =πΌ Γπ ΓπΉπΉ (2) πππ ππΆ ππΆ π πΊΓπ΄ πππhπ‘ 3. RESULTS AND DISCUSSION 3.1. UV-VisandFTIRSpectraofCurcumin-Dye Figure 2 shows the absorption spectra of curcumin-dye resulted of UV-Vis spectrophotometry test. It can be seen that absorbance peaks occurs in the range of wavelength of 400-520 nm. The wide range absorption 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0h 100 h 200 h 400 500 600 Wavelength (nm) 700 Fig. 2. Absorption spectra of curcumin-dyes exposure to light and heat for 0, 100, and 200 hours. Fig. 3. FT-IR spectra of curcumin-dyes subjected to lights and heats for 0, 100, and 200 hours. www.rericjournal.ait.ac.th Absorbance (a.u.)PDF Image | Curcumin-Dye-Sensitized Solar Cells
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