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Volume: 4 Issue: 5
||Polymer-fullerene based bulk heterojunction P3HT:PCBM solar cell: The influence of PTU as a chemical additive on photovoltaic performance
Polymer-fullerene based bulk heterojunction P3HT:PCBM solar cell: The influence of PTU as a chemical additive on photovoltaic performance
The polymer-fullerene based bulk heterojunction (BHJ) polymer solar cells (PSCs), which contain the blends of poly (3-hexylthiophene) (P3HT) and [6, 6] phenyl C61 butyric acid methyl ester (PCBM) with different concentrations of propylthiouracil (PTU) additive were fabricated and characterized in the open air. The current density-voltage characteristics were measured in the dark and under the white light illumination at an illumination intensity of 80 mW/cm2. The consistency of optical absorption and incident monochromatic photon to current conversion efficiency (IPCE) of the PSC with and without additive were studied and compared. Different optimizations were prepared by varying the concentrations of PTU from 0.75% (w/w) to 1.5% (w/w). It has been observed from photovoltaic studies that the PSC with 1% (w/w) of PTU shows the best photovoltaic performance among the other concentrations of PTU and without PTU; with a short circuit current density (JSC) of 5.69 mA/cm2, open circuit voltage (VOC) of 0.648 V, fill factor (FF) of 40%, and power conversion efficiency (PCE) of 1.8%. The PSC with 1% (w/w) of PTU shows the IPCE of 62% at 480 nm. In addition, it has also been observed from the studies that the IPCE spectra of each PSC match the corresponding optical absorption spectra. The results in general show that the addition of 1% (w/w) PTU additive to P3HT:PCBM bulk heterojunction solar cell improves the PCE from 1% to 1.8%.