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Eco-friendly natural dyes as sensitizers for dye-sensitized solar cells (DSSCs)

Research Paper | December 1, 2017

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Ayesha Altaf, Tahira Aziz Mughal, Zafar Iqbal, Safeer Ahmad

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Int. J. Biosci.11( 6), 151-158, December 2017

DOI: http://dx.doi.org/10.12692/ijb/11.6.151-158


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Six natural dyes D1–D6 were extracted from various parts of Hibiscus rosa sinesis, Brassica oleracea, Celosia argentea, Rosa damascena, Rosa macdub (red and yellow) by maceration with ethanol for 24 hours for dye-sensitized solar cells. Their photophysical, electrochemical and photovoltaic studies were carried out. UV-Vis absorption spectra of the dyes D1–D6 showed two distinct bands i.e. π – π* and ICT band. Out of all the extracted dyes, the dye D1 gave best absorption of ICT band at λmax 534 nm. Cyclic voltammetry of the dyes D1–D6 was carried out which revealed the distinct oxidation and reduction peaks in D1 and D2 dyes while in other dyes these peaks were weak. The photovoltaic performance of the dyes D1–D6 was also measured by making sandwich type DSSCs. Their J-V curves showed open circuit voltage values of the dyes were 0.36V, 0.37V, 0.36V, 0.34V, 0.34V, 0.39V and short circuit current density values are 5.48 mA/cm2, 5.69 mA/cm2, 1.71 mA/cm2, 3.99 mA/cm2, 2.71 mA/cm2 and 5.18 mA/cm2 respectively. The best sunlight to energy conversion efficiency was obtained from D1 dye which has better UV absorption and it gave higher short circuit current density which leads to highest efficiency. Other dyes gave the efficiency in the following order D2=0.9% > D6=0.8% > D4=0.5% > D5=0.3% > D3=0.2%.


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Eco-friendly natural dyes as sensitizers for dye-sensitized solar cells (DSSCs)

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