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Revealing the correlation between charge carrier recombination and extraction in an organic solar cell under varying illumination intensity

Abstract

The design and fabrication of better excitonic solar cells are the need of the hour for futuristic energy solutions. This designing needs better understanding of charge transport properties of excitonic solar cells. One of the popular method of understanding the charge transport properties is analysis of 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(~40 nm) /PTB7:PC71BM(~100 nm)/Al ( ~120 Nm) is analysed using one and two diode model at varied illumination intensity in the range of 0.1 to 2.33 suns. It has been found that double diode model is better with respect to single diode model and can explain the J-V characteristics of the OSCs correctly. Further, the recombination mechanism is investigated thoroughly and it is observed that fill factor (FF) is in the range of 62.5% to 41.4% for the corresponding values of the recombination to extraction ratio (θ) varying from 0.001 to 0.023. These finding have been attributed to the change in charge transport mechanism from trap assisted to bimolecular recombination with the variation of illumination intensity.

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Publication details

The article was accepted on 04 Sep 2017 and first published on 04 Sep 2017


Article type: Paper
DOI: 10.1039/C7CP05235A
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Revealing the correlation between charge carrier recombination and extraction in an organic solar cell under varying illumination intensity

    A. sharma, M. Chauhan , V. Bharti, M. Kumar, S. Chand, B. Tripathi and J. P. Tiwari, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP05235A

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