TY - JOUR
T1 - Relationship between Energetic Disorder and Reduced Recombination of Free Carriers in Organic Solar Cells
AU - Hosseini, Seyed Mehrdad
AU - Wilken, Sebastian
AU - Sun, Bowen
AU - Huang, Fei
AU - Jeong, Sang Young
AU - Woo, Han Young
AU - Coropceanu, Veaceslav
AU - Shoaee, Safa
N1 - Funding Information:
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.
Funding Information:
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.
Publisher Copyright:
© 2023 The Authors. Advanced Energy Materials published by Wiley-VCH GmbH.
PY - 2023/2/24
Y1 - 2023/2/24
N2 - 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.
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.
KW - energetic disorder
KW - non-radiaive decay
KW - reduced recombination
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U2 - 10.1002/aenm.202203576
DO - 10.1002/aenm.202203576
M3 - Article
AN - SCOPUS:85145730583
SN - 1614-6832
VL - 13
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 8
M1 - 2203576
ER -