Abstract
Novel organic dyes PHR and PHP possessing different acceptors have been synthesized, characterized and exploited as effective sensitizers for dye sensitized solar cells. These sensitizers were utilized for the fabrication on newly synthesized CdS nanowires to study the impact of anchor groups on their photovoltaic performance. Optical, electrochemical and photovoltaic properties for the novel dyes and their solar cell devices have been explored to investigate the influence of different anchors on the dyes. The detailed photovoltaic investigation demonstrated that the photovoltaic efficiency of PHP device shows 3.21 times while the PHR device shows 1.87 times than the bare CdS NWs device. This indicates that the dye containing pyridine ring as anchoring group (PHP) works effectively and shows enhancement in the photovoltaic efficiency than the dye containing Rhodanine-3-acetic acid (R3A). Hence, the widely used R3A group for sensitizers may not be the optimal choice for dye sensitized solar cells (DSSCs). The density functional theory (DFT) calculation revealed the proper pathway of electron injection from dye to CdS NWs in pyridine containing dye than in rhodanine dye which is responsible for increase in the efficiency.
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