Relationship between Energetic Disorder and Reduced Recombination of Free Carriers in Organic Solar Cells

Seyed Mehrdad Hosseini; Sebastian Wilken; Bowen  Sun; Fei Huang; Sang Young Jeong; Han Young  Woo; Veaceslav Coropceanu; Safa Shoaee

doi:10.1002/aenm.202203576

Relationship between Energetic Disorder and Reduced Recombination of Free Carriers in Organic Solar Cells

Seyed Mehrdad Hosseini, Sebastian Wilken, Bowen Sun, Fei Huang, Sang Young Jeong, Han Young Woo, Veaceslav Coropceanu, Safa Shoaee^*

^*Corresponding author for this work

Physics

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Abstract

Reducing non-radiative recombination is key to achieve high fill factors (FFs) in organic solar cells. While it is generally accepted that recombination proceeds via charge transfer (CT) states at the donor:acceptor interface, the underlying principles that dictate the decay kinetics of these CT states are not yet well understood. Here, a study on the effect of energetic disorder is presented. Based on a data set of 10 representative donor:acceptor blends, clear correlations between disorder, the recombination coefficient of free charge carriers, and the non-radiative voltage loss are found. It is suggested that a narrower distribution of CT energies leads to a longer CT decay time and thus reduces non-radiative losses. This leads to a simultaneous improvement of the FF and open circuit voltage and highlights the importance of having materials with low energetic disorder on the way to the commercialisation of organic photovoltaics.

Original language	English
Article number	2203576
Journal	Advanced Energy Materials
Volume	13
Issue number	8
DOIs	https://doi.org/10.1002/aenm.202203576
Publication status	Published - 24 Feb 2023
MoE publication type	A1 Journal article-refereed

Funding

This work was supported by the Alexander von Humboldt Foundation and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through the project Fabulous (NE 410/20, SH 1669/1-1). S.S. thanks Dieter Neher (University of Potsdam) for fruitful discussions and access to laboratories. H.Y.W. acknowledges financial support from the National Research Foundation of Korea (grants NRF2020M3H4A3081814 and 2019R1A6A1A11044070). S.W. acknowledges funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No 799801 (“ReMorphOPV”). V.C. acknowledges funding by the Office of Naval Research under award No N00014-20-1-2110 and the University of Arizona. Open access funding enabled and organized by Projekt DEAL. This work was supported by the Alexander von Humboldt Foundation and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through the project Fabulous (NE 410/20, SH 1669/1‐1). S.S. thanks Dieter Neher (University of Potsdam) for fruitful discussions and access to laboratories. H.Y.W. acknowledges financial support from the National Research Foundation of Korea (grants NRF2020M3H4A3081814 and 2019R1A6A1A11044070). S.W. acknowledges funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska‐Curie grant agreement No 799801 (“ReMorphOPV”). V.C. acknowledges funding by the Office of Naval Research under award No N00014‐20‐1‐2110 and the University of Arizona.

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10.1002/aenm.202203576Licence: CC BY

Advanced Energy Materials - 2023 - Hosseini - Relationship between Energetic Disorder and Reduced Recombination of FreeFinal published version, 1.2 MBLicence: CC BY

https://urn.fi/URN:NBN:fi-fe2023050139709

ReMorphOPV: Recombination in Organic Photovoltaics: Impact of Morphology and Long-Range Non-Equilibrium Transport
Wilken, S. (Principal Investigator) & Österbacka, R. (Co-Investigator)
15/01/19 → 21/02/21
Project: EU

Cite this

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abstract = "Reducing non-radiative recombination is key to achieve high fill factors (FFs) in organic solar cells. While it is generally accepted that recombination proceeds via charge transfer (CT) states at the donor:acceptor interface, the underlying principles that dictate the decay kinetics of these CT states are not yet well understood. Here, a study on the effect of energetic disorder is presented. Based on a data set of 10 representative donor:acceptor blends, clear correlations between disorder, the recombination coefficient of free charge carriers, and the non-radiative voltage loss are found. It is suggested that a narrower distribution of CT energies leads to a longer CT decay time and thus reduces non-radiative losses. This leads to a simultaneous improvement of the FF and open circuit voltage and highlights the importance of having materials with low energetic disorder on the way to the commercialisation of organic photovoltaics.",

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AU - Hosseini, Seyed Mehrdad

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AU - Coropceanu, Veaceslav

AU - Shoaee, Safa

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AB - Reducing non-radiative recombination is key to achieve high fill factors (FFs) in organic solar cells. While it is generally accepted that recombination proceeds via charge transfer (CT) states at the donor:acceptor interface, the underlying principles that dictate the decay kinetics of these CT states are not yet well understood. Here, a study on the effect of energetic disorder is presented. Based on a data set of 10 representative donor:acceptor blends, clear correlations between disorder, the recombination coefficient of free charge carriers, and the non-radiative voltage loss are found. It is suggested that a narrower distribution of CT energies leads to a longer CT decay time and thus reduces non-radiative losses. This leads to a simultaneous improvement of the FF and open circuit voltage and highlights the importance of having materials with low energetic disorder on the way to the commercialisation of organic photovoltaics.

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Relationship between Energetic Disorder and Reduced Recombination of Free Carriers in Organic Solar Cells

Abstract

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ReMorphOPV: Recombination in Organic Photovoltaics: Impact of Morphology and Long-Range Non-Equilibrium Transport

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