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Khamidinal Khamidinal
Sunan Kalijaga State Islamic University Yogyakarta
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Krokot Extract (Portulaca Oleracea. L) as Natural Light-harvesting pigments for Dye-Sensitized Solar Cells (DSSCs) : Influence of Dye Acidity Cici Nurfaizah; Didik Krisdiyanto; Khamidinal Khamidinal; Sudarlin Sudarlin
Biology, Medicine, & Natural Product Chemistry Vol 4, No 1 (2015)
Publisher : Sunan Kalijaga State Islamic University & Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (385.305 KB) | DOI: 10.14421/biomedich.2015.41.17-24

Abstract

Dye-sensitized solar cells (DSSCs) was fabricated using natural dyes extracted from krokot (Portulaca Oleracea. L). The effect of dye acidity was investigated on natural pH extract, 5.00, 4.00 and 3.00 of pH. The efficiency and stability DSSCs as a function of the dye acidity was studied. The result of the UV-Vis shows that the absorption of wave-length from dye extract of krokot is located in the visible region with the absorbance peak in 410.5 nm and 664.5 nm which are the peak of chlorophyll. The efficiency of extract krokot dye sensitized solar cells was decreasing  6.88 x 10-3 %  to  0.42 x 10-3 % when pH of the dye was adjusted from 6.27 to 3.00. DSSCs stability was also decreased look for efficiency loss from 5.27% to 97.49% in the same conditions.
Krokot (Portulaca oleracea L) As a Natural Sensitizer for TiO2 Dye-sensitized Solar Cells: The Effect of Temperature Extract Reyza Anni Mufidah; Khamidinal Khamidinal; Endaruji Sedyadi; Didik Krisdiyanto
Biology, Medicine, & Natural Product Chemistry Vol 4, No 2 (2015)
Publisher : Sunan Kalijaga State Islamic University & Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (901.766 KB) | DOI: 10.14421/biomedich.2015.42.25-29

Abstract

The solar cell is formed by a sandwich structure, in which two electrodes flank the primary electrolyte that is containing redox I-/based on PEG (Polyethylene Glycol). The working-electrode which is TiO2 layer on an ITO glass substrate is sensitized with krokot dye as the electron donor. The counter electrode is a layer of carbon. The fabrication cell is immersed with the krokot dye with 40°C, 50°C, 60°C extract temperature. The result of the UV-Vis shows that the absorption of wave-length from dye extract of krokot is located in the visible region with the absorbance peak in 420,5 nm and 665,5 nm which are the peak of chlorophyll. For the UV-Vis solid system, there are the highest band gap  in  50°C extract temperature that make the capability of absorption toward UV spectrum is large. Furthermore, in the functional group analysed by FT-IR, there are shiften-carbonil and hydroxyl group after they are sensitized. From the current and voltage test with I-V meter keithley 2400 is resulted that on the 50°C extract temperature produces the highest efficiency of reaches which is 2.63 x 10-3 %.
Co-Authors Cici Nurfaizah Didik Krisdiyanto Endaruji Sedyadi Reyza Anni Mufidah Sudarlin Sudarlin