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A High Efficiency Chlorophyll Sensitized Solar Cell with Quasi Solid PVA Based Electrolyte
The objective of this work is to investigate the performance of chlorophyll sensitized solar cells (CSSCs) with gel electrolyte based on polyvinyl alcohol (PVA) with single iodide salt (potassium iodide (KI)) and double salt (KI and tetrapropylammonium iodide (TPAI)). Chlorophyll was extracted from the bryophyte Hyophila involuta. The CSSC with electrolyte containing only KI salt produced a short circuit current density (Jsc) of 4.59mA cm−2, open circuit voltage (Voc) of 0.61V, fill factor (FF) of 0.64, and efficiency (η) of 1.77%. However, the CSSC with double salt electrolyte exhibited Jsc of 5.96mA cm−2, Voc of 0.58V, fill factor FF of 0.58, and η of 2.00%. Since CSSC with double salt electrolyte showed better efficiency, other cells fabricated will use the double salt electrolyte. On addition of 0.7M tetrabutyl pyridine (TBP) to the double salt electrolyte, the cell's efficiency increased to 2.17%, Jsc = 5.37mA cm−2, Voc = 0.55V, and FF = 0.73. With 5mM chenodeoxycholic acid (CDCA) added to the chlorophyll, the light to electricity efficiency increased to 2.62% with Jsc of 8.44mAcm−2, Voc of 0.54V, and FF of 0.58.
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