Application of dyes extracted from Alternanthera dentata leaves and Musa acuminata bracts as natural sensitizers for dye-sensitized solar cells

Spectrochim Acta A Mol Biomol Spectrosc. 2018 Mar 5;192:487-498. doi: 10.1016/j.saa.2017.11.018. Epub 2017 Nov 7.


The natural dyes anthocyanin and chlorophyll were extracted from Musa acuminata bracts and Alternanthera dentata leaves, respectively. The dyes were then applied as sensitizers in TiO2-based dye-sensitized solar cells (DSSCs). The ethanol extracts of the dyes had maximum absorbance. High dye yields were obtained under extraction temperatures of 70 to 80°C, and the optimal extraction temperature was approximately 80°C. Moreover, dye concentration sharply decreased under extraction temperatures that exceeded 80°C. High dye concentrations were obtained using acidic extraction solutions, particularly those with a pH value of 4. The DSSC fabricated with anthocyanin from M. acuminata bracts had a conversion efficiency of 0.31%, short-circuit current (Isc) of 0.9mA/cm2, open-circuit voltage (Voc) of 0.58V, and fill factor (FF) of 62.22%. The DSSC sensitized with chlorophyll from A. dentata leaves had a conversion efficiency of 0.13%, Isc of 0.4mA/cm-2,Voc of 0.54V, and FF of 67.5%. The DSSC sensitized with anthocyanin from M. acuminata bracts had a maximum incident photon-to-current conversion efficiency of 42%, which was higher than that of the DSSC sensitized with chlorophyll from A. dentata leaves (23%). Anthocyanin from M. acuminata bracts exhibited the best photosensitization effects.

Keywords: A. dentata; Anthocyanin; Chlorophyll; DSSC; M. acuminata; Natural dyes.

MeSH terms

  • Amaranthaceae / chemistry*
  • Anthocyanins / chemistry
  • Calibration
  • Chlorophyll / chemistry
  • Coloring Agents / isolation & purification*
  • Electrochemistry
  • Hydrogen-Ion Concentration
  • Musa / chemistry*
  • Photons
  • Plant Extracts / chemistry
  • Plant Leaves / chemistry*
  • Solar Energy*
  • Solvents / chemistry
  • Spectrometry, X-Ray Emission
  • Spectroscopy, Fourier Transform Infrared
  • Surface Properties
  • Temperature
  • Titanium / chemistry
  • X-Ray Diffraction


  • Anthocyanins
  • Coloring Agents
  • Plant Extracts
  • Solvents
  • Chlorophyll
  • titanium dioxide
  • Titanium