Sharma, Abhishek and Chauhan, Mihirsinh and Bharti, Vishal and Kumar, Manoj and Chand, Suresh and Tripathi, Brijesh and Tiwari, J. P. (2017) Revealing the correlation between charge carrier recombination and extraction in an organic solar cell under varying illumination intensity. Physical Chemistry Chemical Physics, 19 (38). pp. 26169-26178. ISSN 1463-9076

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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 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.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M\S Royal Society of Chemistry.
Subjects:	Chemistry > Physical Chemistry Physics > Atomic and Molecular Physics
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	20 Feb 2019 06:23
Last Modified:	20 Feb 2019 06:23
URI:	http://npl.csircentral.net/id/eprint/2838

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