Localized trions in conjugated polymers

Kadashchuk, A.; Архипов, В. И.; Kim, Chang-Hwan; Shinar, J.; Lee, D.-W.; Hong, Young Rae; Jin, Jung‐Il; Heremans, Paul; Bäßler, H.

doi:10.1103/physrevb.76.235205

Cited by 65 publications

(52 citation statements)

References 60 publications

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“…This evidence suggests that the spin dependent process under examination directly affects the recombination rate and is independent of space charge reaction time which is bias dependent. Models that directly influence the recombination rate need to be taken into account [8,16]. It should be noted that both electron and hole mobilities explicitly appear in the Langevin expression for the recombination rate (Eqn.…”

Section: Simulations and Discussionmentioning

confidence: 99%

“…This possibility was further confirmed by time of flight measurements performed on Alq 3 thin films, which showed that carrier mobility can be affected by the magnetic field [13]. Continuous wave (CW) magnetic resonance techniques were also used as alternative methods to investigate spin effects in organic semiconductors [4,5,[14][15][16]. However there are very few papers on time resolved studies, in spite of the abundance of information that these techniques can provide [17,18].…”

Section: Introductionmentioning

confidence: 97%

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Pulsed magnetic resonance of Alq3 OLED detected by electroluminescence

Comandè

Ansermet

2013

Synthetic Metals

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The aim of the present work is to investigate the nature of spin dependent processes in an organic light emitting diode based on a ITO/ α-NPD/Alq3 structure. The electroluminescence time response of the sample is monitored while the OLED is exposed to a high power resonant microwave pulse. Measurements are carried out at room temperature. The time scale of the induced transition is found to be independent of the bias voltage. It is shown, by way of a simulation, that this behavior appears inconsistent with models which attribute a change in the electroluminescence to a variation in charge mobility. Spin dependent processes directly related to a change in the rate of charge recombination play therefore a relevant role in Alq 3 light emitting diodes.

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Section: Simulations and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Pulsed magnetic resonance of Alq3 OLED detected by electroluminescence

Comandè

Ansermet

2013

Synthetic Metals

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“…Almost all parameters can be taken from the literature. 19,23,30,[36][37][38][39] The only unknown parameter is P T , although it should be on the order of a few percent at large magnetic fields. 11 We can also derive the MC of the HFE with…”

Section: Analytical Calculationsmentioning

confidence: 99%

“…However, Kadashchuk et al 23 have recently shown that charged excitons can be metastable if they are created at a polaron trap site, and in this form they refer to them as trions. A trion can have a lifetime on the order of milliseconds, after which it releases the polaron again via a dissociation or recombination process.…”

Section: Introductionmentioning

confidence: 99%

“…3,21 Additionally, the magnetic-field dependent quenching of triplet excitons at trapped charges has been considered, which can lead to the release of these charges. 15,24 The trapping of triplet excitons themselves, which can then lead to the formation of metastable trions, 23 has as far as we know not been investigated with respect to magnetic-field effects. Additionally, accurate voltage dependent calculations of the MC have never been performed for such mechanisms.…”

Section: Introductionmentioning

confidence: 99%

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Traps and trions as origin of magnetoresistance in organic semiconductors

et al. 2013

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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.

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Improving Operational Stability of p‐Type Field‐Effect Transistors by Charge Selective Electrodes: a General Strategy

Zhou

Zhu

et al. 2019

Adv Elect Materials

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Operational instability caused by unintentional electron injection is a common problem for field‐effect transistors (FETs) based on relatively narrow‐bandgap semiconductors. Typically, the electron injection is followed by electron trapping at the semiconductor/dielectric interface or sometimes in the bulk semiconductor, resulting in a modification of the built‐in field in the FETs. Such a dynamic process causes continuous threshold voltage or Dirac voltage (Vth/Dirac) shift and thus unstable device operation. A charge‐selective electrode (CSE) design is used to address these problems. The CSE is formed by inserting a molybdenum trioxide interlayer between the electrode and the semiconductor, which creates an energy barrier to block electron injection. It is shown that the CSE strategy can generally work for FETs based on three semiconductor families, namely conjugated polymer, graphene, and quantum dot, and greatly suppresses the Vth/Dirac shift, enhancing the bias stress stability as well as reducing the noise level of the FETs. The mechanism for CSE‐reduced bias stress is investigated through trap analysis. CSE is a general strategy for achieving stable and low‐noise operation of unipolar FETs. The device design concept can be applied to other device configurations.

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Localized trions in conjugated polymers

Cited by 65 publications

References 60 publications

Pulsed magnetic resonance of Alq3 OLED detected by electroluminescence

Pulsed magnetic resonance of Alq3 OLED detected by electroluminescence

Traps and trions as origin of magnetoresistance in organic semiconductors

Improving Operational Stability of p‐Type Field‐Effect Transistors by Charge Selective Electrodes: a General Strategy

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