Conduction and electroluminescence from organic continuous and nanofiber thin films

Kjelstrup‐Hansen, Jakob; Liu, Xuhai; Henrichsen, Henrik Hartmann; Thilsing-Hansen, Kasper; Rubahn, Horst‐Günter

doi:10.1002/pssc.200983812

Cited by 10 publications

(10 citation statements)

References 8 publications

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“…For comparison, Klauk et al [ 38 ] have studied the electrical characteristics for pentacene transistors with 100 nm SiO 2 as the gate dielectric and found a subthreshold swing of only 0.7 V/decade. Our results is around a decade above this, however, this is not unexpected since the p 6P mobility is significantly below that found in pentacene [ 21 , 38 ] and since our device geometry (here particularly the gate dielectric thickness) was not optimized for efficient switching.…”

Section: Resultsmentioning

confidence: 48%

“…In addition, the optical and electrical properties [ 19 ] combined with low costs and fairly straight-forward processing (also on flexible substrates [ 12 ]) make these materials interesting candidates for nanoscale optoelectronic and photonic devices applications. The organic semiconductor para-hexaphenylene ( p 6P) can self-assemble into crystalline nanofibers structures that emit polarized, blue light upon UV excitation [ 20 ], and it has been shown to work as light-emitting material in organic light-emitting field-effect transistors (OLEFETs) [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

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Organic nanofibers integrated by transfer technique in field-effect transistor devices

et al. 2011

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The electrical properties of self-assembled organic crystalline nanofibers are studied by integrating these on fieldeffect transistor platforms using both top and bottom contact configurations. In the staggered geometries, where the nanofibers are sandwiched between the gate and the source-drain electrodes, a better electrical conduction is observed when compared to the coplanar geometry where the nanofibers are placed over the gate and the source-drain electrodes. Qualitatively different output characteristics were observed for top and bottom contact devices reflecting the significantly different contact resistances. Bottom contact devices are dominated by contact effects, while the top contact device characteristics are determined by the nanofiber bulk properties. It is found that the contact resistance is lower for crystalline nanofibers when compared to amorphous thin films. These results shed light on the charge injection and transport properties for such organic nanostructures and thus constitute a significant step forward toward a nanofiber-based light-emitting device.

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Section: Resultsmentioning

confidence: 48%

Section: Introductionmentioning

confidence: 99%

Organic nanofibers integrated by transfer technique in field-effect transistor devices

et al. 2011

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“…Another problem related to the issue of a high band gap is the consequence that the lowest unoccupied molecular orbital (LUMO) is close to the vacuum energy level, which reduces the lifetimes of blue OLEDs because the material is susceptible to oxidation. Nevertheless, there are many reports on blue-emitting OLEDs [4,[11][12][13][14][15][16][17][18][19][20] and the optimization of device structure as well as the investigation of new blue emitters is still in progress.…”

Section: Introductionmentioning

confidence: 99%

Non-doped, blue-emitting, color-stable, organic light-emitting diode based on 2,2′:6′,2″-ternaphthalene

et al. 2014

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A novel non-doped blue-emitting material, 2,2 0 :6 0 ,2 00 -ternaphthalene (NNN), which is based on three naphthalene units forming a rodlike molecule, has been synthesized and characterized. Organic light-emitting diodes based on NNN as emitter exhibit blue emission with Commission Internationale de l'Eclairage color coordinates of x = 0.18 and y = 0.11. In addition, the morphology and crystallographic structure of the NNN thin films has been investigated. NNN deposited on poly[3,4-(ethylenedioxy) thiophene]:poly (styrene sulfonate) on Indium Tin Oxide-covered glass forms crystalline structures of high crystallographic quality. The molecules are aligned almost perpendicular to the substrate surface and exhibit a tilt angle of 23 .

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“…Due to the nanofiber geometry, the emitted light has a spatially anisotropic distribution, 11 and the nanofibers have been shown to act as waveguides 12 and random lasers. 13,14 Taken together with the ability of both p-6P thin films and nanofibers to emit light through electrical stimulation, 15 these features could enable future optoelectronic applications. However, the nanofibers exhibit a characteristic photoinduced reaction during illumination with UV light that causes a decrease in luminescence intensity ͑bleaching͒, which is partly attributed to a photooxidation reaction.…”

Section: Introductionmentioning

confidence: 99%

Reduced bleaching in organic nanofibers by bilayer polymer/oxide coating

Tavares

Kjelstrup‐Hansen

Rubahn

et al. 2010

Journal of Applied Physics

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Articles you may be interested inA comparative study of spin coated and floating film transfer method coated poly (3-hexylthiophene)/poly (3hexylthiophene)-nanofibers based field effect transistors Para-hexaphenylene ͑p-6P͒ molecules exhibit a characteristic photoinduced reaction ͑bleaching͒ resulting in a decrease in luminescence intensity upon UV light exposure, which could render the technological use of the nanofibers problematic. In order to investigate the photoinduced reaction in nanofibers, optical bleaching experiments have been performed by irradiating both pristine and coated nanofibers with UV light. Oxide coating materials ͑SiO x and Al 2 O 3 ͒ were applied onto p-6P nanofibers. These treatments caused a reduction in the bleaching reaction but in addition, the nanofiber luminescence spectrum was significantly altered. It was observed that some polymer coatings ͓a statistical copolymer of tetrafluoroethylene and 2,2-bis-trifluoromethyl-4,5-difluoro-1,3-dioxole, P͑TFE-PDD͒, and poly͑methyl methacrylate͒, PMMA͔ do not interfere with the luminescence spectrum from the p-6P but are not effective in stopping the bleaching. Bilayer coatings with first a polymer material, which should work as a protection layer to avoid modifications of the p-6P luminescence spectrum, and second an oxide layer used as oxygen blocker were tested and it was found that a particular bilayer polymer/oxide combination results in a significant reduction in bleaching without affecting significantly the emission spectrum from the nanofibers.

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Conduction and electroluminescence from organic continuous and nanofiber thin films

Cited by 10 publications

References 8 publications

Organic nanofibers integrated by transfer technique in field-effect transistor devices

Organic nanofibers integrated by transfer technique in field-effect transistor devices

Non-doped, blue-emitting, color-stable, organic light-emitting diode based on 2,2′:6′,2″-ternaphthalene

Reduced bleaching in organic nanofibers by bilayer polymer/oxide coating

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