Light intensity dependence of organic solar cell operation and dominance switching between Shockley–Read–Hall and bimolecular recombination losses

Abstract We investigated the variation of current density–voltage (J–V) characteristics of an organic solar cell (OSC) in the dark and at 9 different light intensities ranging from 0.01 to 1 sun of the AM1.5G spectrum. All three conventional parameters, short-circuit currents (J sc), open-circuit vo...

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Autores principales:	Shinyoung Ryu, Na Young Ha, Y. H. Ahn, Ji-Yong Park, Soonil Lee
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/d068d1ecdde34337813647ec4d00c88d
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spelling	oai:doaj.org-article:d068d1ecdde34337813647ec4d00c88d2021-12-02T17:08:43ZLight intensity dependence of organic solar cell operation and dominance switching between Shockley–Read–Hall and bimolecular recombination losses10.1038/s41598-021-96222-w2045-2322https://doaj.org/article/d068d1ecdde34337813647ec4d00c88d2021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96222-whttps://doaj.org/toc/2045-2322Abstract We investigated the variation of current density–voltage (J–V) characteristics of an organic solar cell (OSC) in the dark and at 9 different light intensities ranging from 0.01 to 1 sun of the AM1.5G spectrum. All three conventional parameters, short-circuit currents (J sc), open-circuit voltage (V oc), and Fill factor (FF), representing OSC performance evolved systematically in response to light intensity increase. Unlike J sc that showed quasi-linear monotonic increase, V oc and FF showed distinctive non-monotonic variations. To elucidate the origin of such variations, we performed extensive simulation studies including Shockley–Read–Hall (SRH) recombination losses. Simulation results were sensitive to defect densities, and simultaneous agreement to 10 measured J–V curves was possible only with the defect density of $$5 \times 10^{12} {\text{ cm}}^{ - 3}$$ 5 × 10 12 cm - 3 . Based on analyses of simulation results, we were able to separate current losses into SRH- and bimolecular-recombination components and, moreover, identify that the competition between SRH- and bimolecular-loss currents were responsible for the aforementioned variations in J sc, V oc, and FF. In particular, we verified that apparent demarcation in V oc, and FF variations, which seemed to appear at different light intensities, originated from the same mechanism of dominance switching between recombination losses.Shinyoung RyuNa Young HaY. H. AhnJi-Yong ParkSoonil LeeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Shinyoung Ryu Na Young Ha Y. H. Ahn Ji-Yong Park Soonil Lee Light intensity dependence of organic solar cell operation and dominance switching between Shockley–Read–Hall and bimolecular recombination losses
description	Abstract We investigated the variation of current density–voltage (J–V) characteristics of an organic solar cell (OSC) in the dark and at 9 different light intensities ranging from 0.01 to 1 sun of the AM1.5G spectrum. All three conventional parameters, short-circuit currents (J sc), open-circuit voltage (V oc), and Fill factor (FF), representing OSC performance evolved systematically in response to light intensity increase. Unlike J sc that showed quasi-linear monotonic increase, V oc and FF showed distinctive non-monotonic variations. To elucidate the origin of such variations, we performed extensive simulation studies including Shockley–Read–Hall (SRH) recombination losses. Simulation results were sensitive to defect densities, and simultaneous agreement to 10 measured J–V curves was possible only with the defect density of $$5 \times 10^{12} {\text{ cm}}^{ - 3}$$ 5 × 10 12 cm - 3 . Based on analyses of simulation results, we were able to separate current losses into SRH- and bimolecular-recombination components and, moreover, identify that the competition between SRH- and bimolecular-loss currents were responsible for the aforementioned variations in J sc, V oc, and FF. In particular, we verified that apparent demarcation in V oc, and FF variations, which seemed to appear at different light intensities, originated from the same mechanism of dominance switching between recombination losses.
format	article
author	Shinyoung Ryu Na Young Ha Y. H. Ahn Ji-Yong Park Soonil Lee
author_facet	Shinyoung Ryu Na Young Ha Y. H. Ahn Ji-Yong Park Soonil Lee
author_sort	Shinyoung Ryu
title	Light intensity dependence of organic solar cell operation and dominance switching between Shockley–Read–Hall and bimolecular recombination losses
title_short	Light intensity dependence of organic solar cell operation and dominance switching between Shockley–Read–Hall and bimolecular recombination losses
title_full	Light intensity dependence of organic solar cell operation and dominance switching between Shockley–Read–Hall and bimolecular recombination losses
title_fullStr	Light intensity dependence of organic solar cell operation and dominance switching between Shockley–Read–Hall and bimolecular recombination losses
title_full_unstemmed	Light intensity dependence of organic solar cell operation and dominance switching between Shockley–Read–Hall and bimolecular recombination losses
title_sort	light intensity dependence of organic solar cell operation and dominance switching between shockley–read–hall and bimolecular recombination losses
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/d068d1ecdde34337813647ec4d00c88d
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Light intensity dependence of organic solar cell operation and dominance switching between Shockley–Read–Hall and bimolecular recombination losses

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