Dispersive Charge Transfer State Electroluminescence in Organic Solar Cells

Raju Lampande; Adrian Pizano; Manting GuiRobert CawthornBarry P. RandNoel C. Giebink

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Dispersive Charge Transfer State Electroluminescence in Organic Solar Cells

机译：Dispersive Charge Transfer State Electroluminescence in Organic Solar Cells

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The notion of quasi-equilibrium is central to most solar cells; however, it hasbeen questioned in organic photovoltaics (OPVs) owing to strong energeticdisorder that frustrates efficient relaxation of electrons and holes within theirrespective density of states (DOS). Here, modulation electroluminescence(EL) spectroscopy is applied to OPVs and it is found that the frequencyresponse of charge transfer (CT) state EL on the high energy side of thespectrum differs from that of the low energy side. This observation confirmsthat static disorder contributes substantially to the linewidth of thesteady-state EL spectrum and is unambiguous proof that the distribution ofCT states formed by electrical injection in the dark is not in quasi-equilibrium.These results emphasize the need for caution when analyzing OPV cells onthe basis of reciprocity models that assume quasi-equilibrium holds, andhighlight a new method to study this unusual aspect of OPV operation.

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《Advanced energy materials》 |2023年第24期|2300394.1-2300394.9|共9页
作者
Raju Lampande; Adrian Pizano; Manting GuiRobert CawthornBarry P. RandNoel C. Giebink;
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作者单位

Department of Electrical EngineeringThe Pennsylvania State UniversityUniversity Park, PA 16802, USA;

Department of Electrical EngineeringPrinceton UniversityPrinceton, NJ 08544, USA;

Department of Electrical EngineeringPrinceton UniversityPrinceton, NJ 08544, USA;

Andlinger Center for Energy and the Environment, Department ofElectrical EngineeringPrinceton UniversityPrinceton, NJ 08544, USADepartment of Electrical EngineeringThe Pennsylvania State UniversityUniversity Park, PA 16802, USA,Department of Electrical Engineering and Computer ScienceUniversity of MichiganAnn Arbor, MI 48109, USA;

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正文语种英语
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density of states; disorder; non-equilibrium; organic photovoltaics; relaxation;

Dispersive Charge Transfer State Electroluminescence in Organic Solar Cells

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