Corpus ID: 235422167

General Rules for the Impact of Energetic Disorder and Mobility on Nongeminate Recombination in Phase-Separated Organic Solar Cells

@inproceedings{Zuo2021GeneralRF,
  title={General Rules for the Impact of Energetic Disorder and Mobility on Nongeminate Recombination in Phase-Separated Organic Solar Cells},
  author={Guangzheng Zuo and Safa Shoaee and M. Kemerink and D. Neher},
  year={2021}
}
State of the art organic solar cells exhibit power conversion efficiencies of 18 % and above. These devices benefit from a significant suppression of free charge recombination with regard to the Langevin-limit of charge encounter in a homogeneous medium. It has been recognized that the main cause of suppressed free charge recombination is the reformation andΒ 

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References

SHOWING 1-10 OF 57 REFERENCES
Disorder vs. Delocalization: Which Is More Advantageous for High-Efficiency Organic Solar Cells?
TLDR
It is found that energetic disorder reduces dramatically the fill factors and power conversion efficiencies in high efficiency solar cells that require high carrier delocalization within the conjugated segment and high mobility-lifetime product. Expand
Encounter-limited charge-carrier recombination in phase-separated organic semiconductor blends.
TLDR
For domain sizes typical of organic photovoltaic devices, it is found that phase separation reduces the recombination rate by less than one order of magnitude compared to the Langevin model and the mobility dependence can be approximated by the geometric mean. Expand
Entropy and Disorder Enable Charge Separation in Organic Solar Cells.
TLDR
It is found that even modest amounts of disorder have a decisive effect, reducing the charge-separation barrier to about kBT or eliminating it altogether, and the charges are usually not thermodynamically bound at all and could separate spontaneously if the kinetics otherwise allowed it. Expand
Equilibrated Charge Carrier Populations Govern Steady-State Nongeminate Recombination in Disordered Organic Solar Cells.
TLDR
It is concluded that energetic relaxation of photogenerated carriers outpaces any significant nongeminate recombination under application-relevant illumination conditions and quasi-equilibrium conceptsΒ appear suited for describing the open-circuit voltage of organic solar cells despite pronounced energetic disorder. Expand
Barrierless Free Charge Generation in the High-Performance PM6:Y6 Bulk Heterojunction Non-Fullerene Solar Cell.
TLDR
Free charge generation in the high-performance blend of the donor polymer PM6 with the NFA Y6 is thoroughly investigated and it is shown that photocurrent generation is essentially barrierless with near-unity efficiency, regardless of excitation energy. Expand
Impact of Bimolecular Recombination on the Fill Factor of Fullerene and Nonfullerene-Based Solar Cells: A Comparative Study of Charge Generation and Extraction
Power conversion efficiencies of donor/acceptor organic solar cells utilizing nonfullerene acceptors have now increased beyond the record of their fullerene-based counterparts. There remain many fu...
Reduced Recombination and Capacitor-like Charge Buildup in an Organic Heterojunction.
TLDR
Observations suggest that with particular nanoscale morphologies, the bulk heterojunction can go beyond its established role in charge photogeneration, and can act as a capacitor, where adjacent free charges are held away from the interface and can be protected from bimolecular recombination. Expand
Nonequilibrium Charge Dynamics in Organic Solar Cells
The dynamics of charge carriers after their creation at, or near, an interface play a critical role in determining the efficiency of organic solar cells as they dictate, via mechanisms that are not… Expand
Conditions for Energetics and Kinetics of Bound and Free States in High Efficiency Organic Solar Cells
The thermodynamic limit for the efficiency of solar cells is predominantly defined by the energy bandgap of the used semiconductor. In case of organic solar cells both energetics and kinetics of… Expand
Bimolecular recombination in polymer/fullerene bulk heterojunction solar cells
Bimolecular recombination in organic semiconductors is known to follow the Langevin expression, i.e., the rate of recombination depends on the sum of the mobilities of both carriers. We show that… Expand
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