On the role of magnetic field spin effect in photoconductivity of composite films of MEH-PPV and nanosized particles of PbS

Tolstov, I.; Belov, Artem; Kaplunov, M. G.; Yakuschenko, Igor K.; Spitsina, N. G.; Triebel, M.M.; Frankevich, E. L.

doi:10.1016/j.jlumin.2004.09.091

Cited by 37 publications

(23 citation statements)

References 18 publications

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“…The comparison between MEHPPV and P3HT implies that the negative component in the MFE PC can be attributed to the triplet exciton-charge reaction. [82] Furthermore, the experimental result in which the triplet Ir(ppy) 3 does not show any MFE PC suggests that the effects on triplet exciton-charge reaction rate constant depend on SOC. This is because when the SOC is not very strong, a low magnetic field can weaken the ionic characteristic of the triplet excitons, and consequently decrease the triplet-charge reaction governed by electrical dipole-dipole interactions.…”

Section: Mfes On Photocurrent (Mfe Pc )mentioning

confidence: 99%

“…[72][73][74][75][76][77][78][79][80][81] This phenomenon, named as MFEs on the photocurrent (MFE PC ), can be readily observed in organic semiconducting materials [82][83][84][85] and also in organic-material complex systems [60,86,87] with an amplitude of about 5%. It can be envisioned that the MFEs on photocurrents can elucidate not only photoexcited processes but also photovoltaic channels in organic semiconducting materials.…”

Section: Mfes On Photocurrent (Mfe Pc )mentioning

confidence: 99%

“…The studies of phosphorescence and delayed-fluorescence quenching indicate that excitons can interact with trapped charge carriers with the outcome of detrapping them. [82,[89][90][91][92] In addition, the triplet excitons can also react with free charge carriers in organic materials, with the outcome of dissociating e-h pairs. [93,94] The e-h separation was also shown in the MFEs on electroluminescence, where dissociated electrons and holes maintain their spin polarizations from their parent triplet excitons and the reform triplet excitons from their recombination.…”

Section: Mfes On Photocurrent (Mfe Pc )mentioning

confidence: 99%

“…First, it still demands direct experimental proof to support that the positive MFE PC are due to the dissociation of polaron pairs, namely polaron-pair model, [82][83][84] based on magnetic-field-dependent singlet and triplet ratios in polaronpair states. Second, there is still controversy about whether the negative MFE PC comes from triplet exciton-charge reaction, named charge reaction model, [82][83][84] or from the intersection between singlet and triplet (T m ¼ À1 ) levels, named level crossing model.…”

Section: Mfes On Photocurrent (Mfe Pc )mentioning

confidence: 99%

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Magnetic‐Field Effects in Organic Semiconducting Materials and Devices

2009

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It has been experimentally discovered that a low magnetic field (less than 500 mT) can substantially change the electroluminescence, photoluminescence, photocurrent, and electrical‐injection current in nonmagnetic organic semiconducting materials, leading to magnetic‐field effects (MFEs). Recently, there has been significant driving force in understanding the fundamental mechanisms of magnetic responses from nonmagnetic organic materials because of two potential impacts. First, MFEs can be powerful experimental tools in revealing and elucidating useful and non‐useful excited processes occurring in organic electronic, optical, and optoelectronic devices. Second, MFEs can lead to the development of new multifunctional organic devices with integrated electronic, optical, and magnetic properties for energy conversion, optical communication, and sensing technologies. This progress report discusses magnetically sensitive excited states and charge‐transport processes involved in MFEs. The discussions focus on both fundamental theories and tuning mechanisms of MFEs in nonmagnetic organic semiconducting materials.

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Section: Mfes On Photocurrent (Mfe Pc )mentioning

confidence: 99%

Section: Mfes On Photocurrent (Mfe Pc )mentioning

confidence: 99%

Section: Mfes On Photocurrent (Mfe Pc )mentioning

confidence: 99%

Section: Mfes On Photocurrent (Mfe Pc )mentioning

confidence: 99%

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Magnetic‐Field Effects in Organic Semiconducting Materials and Devices

2009

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“…In the literature the high-field effect on the photocurrent, and even regular OMAR, is sometimes explained by these reactions of triplet excitons. 34,35 However, most of the calculations on triplet reactions in the literature are focused on single crystals. 13,33,36 We will use the stochastic Liouville equation to study the magnetic-field-dependence of triplet reactions in disordered organic semiconductors.…”

Section: A Basic Conceptsmentioning

confidence: 99%

Microscopic modeling of magnetic-field effects on charge transport in organic semiconductors

et al. 2011

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The stochastic Liouville equation is applied to the field of organic magnetoresistance to perform detailed microscopic calculations on the different proposed models. By adapting this equation, the influence of a magnetic field on the current in bipolaron, electron-hole pair, and triplet models is calculated. The simplicity and wide applicability of the stochastic Liouville equation makes it a powerful tool for interpreting experimental results on magnetoresistance measurements in organic semiconductors. New insights are gained on the influence of hopping rates and disorder on the magnetoresistance.

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Photovoltaic Processes of Singlet and Triplet Excited States in Organic Solar Cells

2008

Adv Funct Materials

103

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This article reports the respective photovoltaic processes of singlet and triplet photoexcited states in dissociation and charge reactions based on the studies of magnetic‐field effects of photocurrents. The magnetic‐field effects of photocurrents reveal that weak donor‐acceptor interactions lead to a two‐step photovoltaic process: dissociation in polaron‐pair states evolved from singlet excitonic states and exciton‐charge reactions occurred in triplet excitonic states in the generation of the photocurrent. However, strong donor‐acceptor interactions yield a one‐step photovoltaic process: direct dissociation of both singlet and triplet excitons in bulk‐heterojunction organic solar cells. In addition, the magnetic‐field effects of photocurrents indicate that the dissociated electrons and holes form charge‐transfer complexes with singlet and triplet spin configurations at donor‐acceptor intermolecular interfaces. As a result, the magnetic‐field effects of photocurrents can deliver a critical understanding of singlet and triplet photovoltaic processes to design advanced solar‐energy materials and devices.

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On the role of magnetic field spin effect in photoconductivity of composite films of MEH-PPV and nanosized particles of PbS

Cited by 37 publications

References 18 publications

Magnetic‐Field Effects in Organic Semiconducting Materials and Devices

Magnetic‐Field Effects in Organic Semiconducting Materials and Devices

Microscopic modeling of magnetic-field effects on charge transport in organic semiconductors

Photovoltaic Processes of Singlet and Triplet Excited States in Organic Solar Cells

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