Exciton diffusion
Exciton diffusion length and charge extraction yield in organic bilayer solar cells
... the exciton diffusion length and also the product of the combined yield of charge-transfer state dissociation with subsequent charge extraction η c ...
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Understanding exciton diffusion in organic solar cells
... In the modelling, a boundary condition was enforced that the population of excitons is zero at the quenching surface. This is valid if the quencher is a perfect acceptor of electrons. The boundary between the polymer and ...
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Engineered exciton diffusion length enhances device efficiency in small molecule photovoltaics
... on exciton diffusion which we measured using singlet-singlet exciton ...to exciton density N which can be described by a rate equation 13, 18 ...
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Tuning crystalline ordering by annealing and additives to study its effect on exciton diffusion in a polyalkylthiophene copolymer
... of exciton–exciton annihilation and degree of crystal- linity was ...The exciton diffusion coefficient increased more than three times upon solvent vapour annealing and is found to be almost ...
11
Effect of annealing on exciton diffusion in a high performance small molecule organic photovoltaic material
... of exciton di ff usion to partially ordered molecular ...ne exciton di ff usion in as-cast fi ...lower exciton di ff usivity toward the substrate measured by surface quenching than that measured by ...
8
Measurements of exciton diffusion in conjugated polymers
... To calculate the Förster radius, using Eq. 3.5, a value of 55% was used for the β -phase PLQY [200] and a refractive index n of 2, measured in glassy PFO lms using ellipsometry (see Fig. 3.15). is gave a Förster radius ...
227
Controlling exciton diffusion and fullerene distribution in photovoltaic blends by side chain modification
... on exciton di ff usion in di ff erent blends of photovoltaic ...the exciton di ff usion length in both AnE-PV copolymers and fi nd it to be at least ...of exciton di ff usion length in semicrystalline ...
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Exciton polaron interactions in polyfluorene films with β phase
... For highest brightnesses fluorescent materials are used, and we study poly[9,9- dioctylfluorenyl-2,7-diyl] (PFO) as the prototypical example of a blue fluorescent emitter. Bright OLEDs have been reported using PFO with a ...
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Characterisation of organic materials for photovoltaic devices
... characteristic exciton diffusion length, see chapter ...an exciton (or separated charge) will most likely not reach a contact before it decays, reducing ef- ...
221
Investigation and Control of "Sphere-Like" Buckminsterfullerene C60 and "Disk-Like" Copper(II) Phthalocyanine.
... Figure 1.1 Solar Cell Performance. Illustration of the relationship between the power conversion efficiency and the current, as a function of voltage, in a photovoltaic cell. .... 8 Figure 1.2 Photoconversion Steps. ...
150
Exciton dynamics in phthalocyanine molecular crystals
... the exciton wavefunction is delocalized over several molecular units or, in some cases, over the whole molecular aggregate, whereas in the opposite (incoherent) regime, the exciton wavefunction is ...
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Dynamic Disorder Drives Exciton Transfer in Tubular Chlorosomal Assemblies
... them to induce additional transient o ff -diagonal coupling terms, which will then have to take into account the two de fi ning characteristics of the chlorosome system: strong coupling between BChl, and the time variation ...
11
A study of photoluminescence properties and performance improvement of Cd doped ZnO quantum dots prepared by the sol–gel method
... The exciton absorption peaks of both samples appear at approximately 340 nm, whereas a blue shift relative to the peak position of unmodified Cd-doped ZnO QDs was observed in the exciton absorption peak for ...
7
Coherent optical spectroscopy in a biological semiconductor quantum dot DNA hybrid system
... of exciton and DNA mode in combination with their interaction to external environments into the Hamiltonian ...the exciton interacts with the environment through S x operator and S z ...the exciton, ...
7
Polariton polariton Interactions and Stimulated Emission in Semiconductor Microcavities
... excitation densities, 22 before collapse of the system to the weak coupling regime at higher powers, thus giving some optimism that such a polariton laser can be achieved in systems with large exciton binding ...
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Inversion of exciton level splitting in quantum dots
... Neutral exciton 共X兲 and biexciton 共XX兲 states from single quantum dots were identified and distinguished from charged exciton states by measuring the power dependence of the spectra, and the fine-structure ...
5
Exciton polariton topological insulator
... first exciton-polariton topological ...Our exciton-polariton topological insulator paves the way for a variety of new topological phenomena, as they involve light-matter interaction, gain, and perhaps most ...
23
Influence of dielectric environment on exciton and bi exciton properties in colloidal, type II quantum dots
... calculate exciton and bi-exciton energies for the same CdSe/CdTe core/shell QD for ten different values of environmental dielectric ...both exciton and bi-exciton energies with increasing ...
6
Talbot effect for exciton polaritons
... an exciton-polariton conden- sate in a 1D buried mesa array of polariton traps [see schematics in ...for exciton-polaritons is uniquely en- abled by the ability of exciton-polaritons to condense into ...
6
Phonon-Assisted Population Inversion of a Single InGaAs/GaAs Quantum Dot by Pulsed Laser Excitation
... the exciton-phonon interaction leads to non-exponential pure-dephasing of the excitonic dipole, as observed in time-resolved four-wave mixing experiments ...
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