Natural dye sensitizer from cassava (Manihot utilissima) leaves extract and its adsorption onto TiO 2 photo-anode

Nurlela, R. Wibowo, Jarnuzi Gunlazuardi

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1 Citation (Scopus)


Interaction between TiO 2 and dyes sensitizer have been studied. The chlorophyll presents in the crude leave extract (CLE-dye) from cassava (Manihot utilissima) was immobilized on to the photo-anode, consists of TiO 2 supported by fluor doped Tin oxide (SnO 2 -F) Glass. The TiO 2 was prepared by Rapid Breakdown Anodization (RBA) method then immobilized on to glass coated by SnO 2 -F using doctor blade technique, to give CLE-dye/TiO 2 /SnO 2 -F/Glass photo-anode. The prepared photo-anode was characterized by UV-Vis-DRS, FTIR, XRD, SEM, electrochemical and spectro-electrochemical systems. In this study, the HOMO (highest occupied molecular orbital) and LUMO (lowest unoccupied molecular orbital) energy level of the CLE-dye were empirically determined by cyclic voltammetry method, while spectro-electro-chemistry method was used to determine the coefficient of degradation and formation of the dyes, and diffusion coefficient of the hole recombination as well. Good anchoring between TiO 2 with dye extracts (CLE-dye) can be seen from value of dye LUMO energy level (-4.26 eV), which is approaching the conduction band of TiO 2 (-4.3 eV). The coefficient of degradation and formation of the CLE-dye showed a quasi reversible and diffusion coefficient hole recombination values were small, indicated that it is quite suitable as a sensitizer in a dyes sensitized solar cell.

Original languageEnglish
Article number012047
JournalIOP Conference Series: Materials Science and Engineering
Issue number1
Publication statusPublished - 2 May 2017
EventInternational Symposium on Current Progress in Functional Materials 2016, ISCPFM 2016 - Bali, Indonesia
Duration: 26 Jul 201627 Jul 2016


  • TiO
  • cassava leaves
  • chlorophyll dyes
  • crude leave extract
  • spectroelectrochemistry

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