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Issue 38, 2017
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Revealing the correlation between charge carrier recombination and extraction in an organic solar cell under varying illumination intensity

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Abstract

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 JV characteristics of a device through theoretical simulation at varied illumination intensity. Herein, a JV 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 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 JV 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 (θ) 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.

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

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Publication details

The article was received on 02 Aug 2017, accepted on 04 Sep 2017 and first published on 04 Sep 2017


Article type: Paper
DOI: 10.1039/C7CP05235A
Citation: Phys. Chem. Chem. Phys., 2017,19, 26169-26178
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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, 19, 26169
    DOI: 10.1039/C7CP05235A

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