• Corpus ID: 119353303

Perturbation of Exciton Aggregate Coupling by Optical Excitation in Crystalline Perfluoropentacene Films

@article{Kolata2016PerturbationOE,
  title={Perturbation of Exciton Aggregate Coupling by Optical Excitation in Crystalline Perfluoropentacene Films},
  author={Kolja Kolata and Sabrina Marquardt and Nils W. Rosemann and A A Mager and Anna-Katharina Hansmann and U. Hofer and Robert Berger and Tobias Breuer and G Witte and Suman Chatterjee},
  journal={arXiv: Materials Science},
  year={2016}
}
Carrier multiplication by singlet exciton fission enhances photovoltaic conversion efficiencies in organic solids. This decay of one singlet exciton into two triplet states promises to overcome the Shockley-Queisser limit as up to two electrons may be harvested per absorbed photon. Intermolecular coupling is deemed mandatory for both, singlet exciton fission and a band-like transport. Such a coupling is manifested, $e.g.$, by the Davydov-splitting of the lowest-energy exciton transition in… 
1 Citations

Figures and Tables from this paper

Revealing Suppressed Intermolecular Coupling Effects in Aggregated Organic Semiconductors by Diluting the Crystal: Model System Perfluoropentacene:Picene.

Strong enhanced emission from PFP in the mixed thin films which can be explained by decoupling is found and real-time investigations of the absorption spectra during growth provide further insight into intermolecular coupling effects on optical properties.

References

SHOWING 1-10 OF 54 REFERENCES

Molecular packing determines singlet exciton fission in organic semiconductors.

This work experimentally shows that singlet exciton fission is greatly enhanced for a slip-stacked molecular arrangement by addressing different crystal axes featuring different packing schemes, and clarifies the controversially debated role of excimer states as intermediary rather than competitive or precursory.

Singlet fission in pentacene through multi-exciton quantum states.

It is shown that singlet fission to produce a pair of triplet excitons must involve an intermediate state that has a multi-exciton character, is energetically accessible from the optically allowed excited state, and efficiently dissociates into multiple electron-hole pairs.

The spectral signatures of Frenkel polarons in H- and J-aggregates.

  • F. Spano
  • Chemistry
    Accounts of chemical research
  • 2010
This Account shows that the aggregation-induced deviations from the Poissonian distribution of vibronic peak intensities take on two extremes identified with ideal H- and J-aggregates, and reveals several more distinguishing traits between the two aggregate types.

Multiphonon relaxation slows singlet fission in crystalline hexacene.

This work presents the first study of singlet fission in crystalline hexacene which, together with tetracene and pentacene, enables the elucidation of mechanistic trends and presents a microscopic theory that quantitatively reproduces the rates in the acene family.

Observing the Multiexciton State in Singlet Fission and Ensuing Ultrafast Multielectron Transfer

Using the model system of pentacene/fullerene bilayers and femtosecond nonlinear spectroscopies, the state ensuing from singlet fission is observed and it is found that multiple electron transfer from the ME state to the fullerene occurs on a subpicosecond time scale, which is one order of magnitude faster than that from the triplet exciton state.

Low-Energy Charge-Transfer Excitons in Organic Solids from First-Principles: The Case of Pentacene

The nature of low energy optical excitations, or excitons, in organic solids is of central relevance to many optoelectronic applications, including solar energy conversion. Excitons in solid

Quasiparticle and optical spectroscopy of the organic semiconductors pentacene and PTCDA from first principles

The broad use of organic semiconductors for optoelectronic applications relies on quantitative understanding and control of their spectroscopic properties. Of paramount importance are the transport

External Quantum Efficiency Above 100% in a Singlet-Exciton-Fission–Based Organic Photovoltaic Cell

Splitting Singlets Solar cell efficiency is limited because light at wavelengths shorter than the cell's absorption threshold does not channel any of its excess energy into the generated electricity.

Triplet states in organic semiconductors

...