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Natural Dye Sensitizer for Grӓtzel Cells: Sepia Melanin

Agnes Mbonyiryivuze, Isaiah Omollo, Balla Diop Ngom, Bonex Mwakikunga, Simon Mokhotjwa Dhlamini, Eugene Park, Malik Maaza

Physics and Materials Chemistry. 2015, 3(1), 1-6 doi:10.12691/pmc-3-1-1
  • Figure 1. A schematic diagram of a dye-sensitized solar cell
  • Figure 2. Sepia Officinalis (a) and the commercial sepia melanin from Sepia Officinalis (b)
  • Figure 3. The XRD spectrum plotted from low data collected by x-ray diffractometer in measuring sepia melanin.
  • Figure 4. UV-Vis spectra of sepia melanin. The UV-Vis wavelength scan showed the absorption was highest at the UV region of 200 to 300 nm, but diminished towards the visible region
  • Figure 5. Typical Raman spectrum of sepia melanin.
  • Figure 6. Fitting analysis of the experimental average Raman spectrum (black continuous line) obtained by means of Gaussian functions (green continuous lines): the sum of the Gaussian bands (red continuous line) is in good agreement with the experimental spectrum.