Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Conventional ruthenium based solar cell which used ruthenium polypyridyl complexes as photosensitizer in the operation of Dye Sensitized Solar Cell (DSSC) achieved efficiency as high as 11%. Nevertheless, the high efficiency of ruthenium based solar cell is offset by their availability of noble metal, toxicity and high processing cost. Alternatively, natural based dye sensitizers which are easily prepared, environmental friendly and cheaper are a less efficient light harvester. However, this should not be a deterrent to continue efforts in searching for new, rare and exotic natural dyes to discover an alternative for ruthenium based dye sensitizer. Sabah, is located in the northern part of the Borneo island. It is well known for its biodiversity of flora, hence is a perfect place to search for new potential natural dye sources. In this study, ten local borneon dyes were extracted from the local flora which harvested from Sabah and utilized as natural dye sensitizers in DSSC. The absorption ability and functional groups of the natural dyes were found using UV-VIS spectroscopy and FT-IR spectroscopy. The DSSC was fabricated using fluorine doped tin oxide glass substrates, local borneon dye, titanium dioxide thin film, polymer gel electrolyte and carbon counter electrode. Then, the efficiencies of the cells were calculated by using current and voltage values which were obtained by using a metal halide lamp as a light source. Next, the stability and lifespan of the DSSC was investigated by observing the cell efficiencies for 14 days. As a result, the range of the open circuit voltages, short circuit currents, fill factors and efficiencies obtained from the ten local borneon natural DSSCs are 0.36-0.54 V, 0.008-0.11mA, 0.2-0.6 and 0.006-0.21% respectively. Overall, local borneon natural dye extracts are potential photosensitizers in the Dye Sensitized Solar Cell system.
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