Natural dye as light-harvesting pigments for quasi-solid-state dye-sensitized solar cells View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2016-08

AUTHORS

Negese Yazie, Delele Worku, Abebe Reda

ABSTRACT

In this paper, quasi-solid-state dye-sensitized solar cell has been constructed based on natural photosensitizers extracted from the bracts of Bougainvillea spectabilis and the leaves of Euphorbia cotinifolia using acidified (0.1 M HCl) distilled water and ethanol separately. The absorption spectra of the extracts were performed in the spectral range from 395 to 750 nm. The cells were assembled using commercial TiO2 powder film and PEDOT coated FTO glasses as working and counter electrodes, respectively, and also the quasi-solid electrolyte sandwiched in between. The Photovoltaic parameters such as short circuit current density (Jsc), open circuit voltage (Voc), fill factor (FF), and overall conversion efficiency (η) for the as-prepared DSSC were determined under 100 mW/cm2 illuminations. The highest open circuit voltage (Voc = 0.549 V) and short circuit current density (Jsc = 0.592 mA/cm2) were obtained from the DSSCs assembled by natural dye extracted with the acidified ethanol of Bougainvillea spectabilis bracts and the leaves of Euphorbia cotinifolia, respectively. The highest power conversation efficiency (η) of the as-prepared DSSC assembled with natural dye extracted from Bougainvillea spectabilis bracts using acidified ethanol as extracting solvent was 0.175 %. The use of Bougainvillea spectabilis and Euphorbia cotinifolia pigments as natural sensitizers along with the use of quasi-solid electrolyte and PEDOT coated FTO counter electrodes could be a possible alternative for the production of low-cost and environment friendly DSSCs. More... »

PAGES

13

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