Recombination of polaron and exciton in conjugated polymers

Meng, Yansong; Liu, X. J.; Di, B.; An, Zhongwei

doi:10.1063/1.3274680

Cited by 52 publications

(35 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…18,30 The process is similar to the trion; recombination leads to an excited free polaron with a higher mobility. However, unlike the trion process, the two pair partners are weakly spin coupled.…”

Section: Triplet-exciton Polaron (Tep)mentioning

confidence: 97%

Differentiation between polaron-pair and triplet-exciton polaron spin-dependent mechanisms in organic light-emitting diodes by coherent spin beating

et al. 2011

View full text Add to dashboard Cite

Pulsed electrically detected magnetic resonance offers a unique avenue to distinguish between polaronpair (PP) and triplet-exciton polaron (TEP) spin-dependent recombination, which control the conductivity and magnetoresistivity of organic semiconductors. Which of these two fundamental processes dominates depends on carrier balance: by injecting surplus electrons we show that both processes simultaneously impact the device conductivity. The two mechanisms are distinguished by the presence of a half-field resonance, indicative of TEP interactions, and transient spin beating, the signature of PPs. Coherent spin Rabi flopping in the half-field (triplet) channel is observed, demonstrating that the triplet exciton has an ensemble phase coherence time of at least 60 ns, offering insight into the effect of carrier correlations on spin dephasing.

show abstract

Section: Triplet-exciton Polaron (Tep)mentioning

confidence: 97%

Differentiation between polaron-pair and triplet-exciton polaron spin-dependent mechanisms in organic light-emitting diodes by coherent spin beating

et al. 2011

View full text Add to dashboard Cite

show abstract

“…[15][16][17][18][19][20] The effect of a magnetic field on these reactions was already considered by Ern and Merrifield in molecular crystals. 15 Desai et al 3 were the first to qualitatively describe how this can give rise to large room-temperature MC in disordered organic semiconductors.…”

Section: Introductionmentioning

confidence: 99%

Traps and trions as origin of magnetoresistance in organic semiconductors

et al. 2013

View full text Add to dashboard Cite

The large effect of a small magnetic field on the current, magnetoconductance (MC), in organic semiconductors-so-called organic magnetoresistance-has puzzled the field of organic spintronics during the last decade. Although the microscopic mechanisms regarding spin mixing are well understood by now, it is still unknown which pairs of spin carrying particles are influencing the current in such a drastic manner. Here, a model for the MC is presented based on the spin selective formation of metastable trions from triplet exciton-polaron pairs. Additionally, the magnetic-field and voltage dependence of the MC are experimentally investigated in materials showing large effects. Using a combination of analytical and numerical calculations, it is shown that the MC is perfectly described by a process in which trions are created at polaron trap sites.

show abstract

“…8 The results showed that a bipolaron and an exciton can react with the production of a polaron and an excited polaron. Very recently, Li et al 9 and Meng et al 10 theoretically investigated the collision process between a polaron and a TE. a) Electronic mail: zhesu@ifm.liu.se.…”

Section: Introductionmentioning

confidence: 99%

Scattering process between polaron and exciton in conjugated polymers

Sun

Liu

Stafström

2011

The Journal of Chemical Physics

View full text Add to dashboard Cite

Scattering process between a negative polaron and an exciton in a polymer chain is investigated by using the Su-Schrieffer-Heeger model modified to include electron-electron interactions, the Brazovskii-Kirova symmetry breaking term, and an external electric field. It is found that the scattering process is spin dependent. If the polaron and the exciton have parallel spins, the polaron can easily pass through the exciton as if it "do not see" the exciton. If the polaron and the exciton have antiparallel spins, there exist strong repulsion between them. The polaron may be bounced back, be dissociated or pass through the exciton depending on the strength of the external electric field. In any of these cases, the polaron cannot break the exciton.

show abstract

Recombination of polaron and exciton in conjugated polymers

Cited by 52 publications

References 33 publications

Differentiation between polaron-pair and triplet-exciton polaron spin-dependent mechanisms in organic light-emitting diodes by coherent spin beating

Differentiation between polaron-pair and triplet-exciton polaron spin-dependent mechanisms in organic light-emitting diodes by coherent spin beating

Traps and trions as origin of magnetoresistance in organic semiconductors

Scattering process between polaron and exciton in conjugated polymers

Contact Info

Product

Resources

About