期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 19, 期 38, 页码 26169-26178出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp05235a
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The design and fabrication of better excitonic solar cells are the need of the hour for futuristic energy solutions. This designing needs a better understanding of the charge transport properties of excitonic solar cells. One of the popular methods of understanding the charge transport properties is the analysis of the J-V characteristics of a device through theoretical simulation at varied illumination intensity. Herein, a J-V characteristic of a polymer: fullerene based bulk heterojunction (BHJ) organic solar cells (OSCs) of structure ITO/PEDOT: PSS (similar to 40 nm)/PTB7: PC71BM (similar to 100 nm)/Al (similar to 120 nm) is analyzed using one-and two-diode models at varied illumination intensity in the range of 0.1-2.33 Sun. It was found that the double diode model is better with respect to the single diode model and can explain the J-V characteristics of the OSCs correctly. Further, the recombination mechanism is investigated thoroughly and it was observed that fill factor (FF) is in the range of 62.5%-41.4% for the corresponding values of the recombination-to-extraction ratio (theta) varying from 0.001 to 0.023. These findings are attributed to the change in charge transport mechanism from trap-assisted to bimolecular recombination with the variation of illumination intensity.
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