Electron Transport in 1,3-Bis(dicyanomethylene)indans

Rommens, J.; Auweraer, Mark Van der; Schryver, F. C. De; Terrell, D.; Meutter, S. De

doi:10.1021/jp953652w

Cited by 6 publications

(6 citation statements)

References 45 publications

(58 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This Gaussian density of states reflects the energetic spread in the transport sites due to disorder. For organic materials is typically around 0.1 eV; [30][31][32][33][34] this value is used throughout this paper unless stated otherwise. To sample the average behaviors of carriers, multiple morphologies with the same characteristics ͑b, ␣, and ͒ are generated.…”

Section: Modelmentioning

confidence: 99%

Charge carrier mobility in disordered organic blends for photovoltaics

Koster

2010

Phys. Rev. B

View full text Add to dashboard Cite

Please check the document version of this publication:• A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal.If the publication is distributed under the terms of Article 25fa of the Dutch Copyright Act, indicated by the "Taverne" license above, please follow below link for the End User Agreement: www.tue.nl/taverne Take down policyIf you believe that this document breaches copyright please contact us at: openaccess@tue.nl providing details and we will investigate your claim. Charge transport in disordered organic blends is studied theoretically by numerically solving the Pauli master equation. The influence of morphology, disorder, electric field, and charge carrier concentration on blend mobility is assessed. Important differences between neat materials and blends are found. The dependence of mobility on charge carrier concentration is more pronounced in blends and it is influenced by the electric field strength. At low charge carrier densities, blend mobility is found to decrease with increasing field. Additionally, the impact of the volume ratio of the constituent materials and their domain size on the mobility is presented. Especially for strongly disordered materials charge transport is favored by relatively large domains. To compare these theoretical findings with existing experimental mobility data, the current density in a space-charge-limited device is computed. The author finds that, for the parameters and morphologies studied, the apparent mobility in such a device decreases with increasing bias voltage.

show abstract

Section: Modelmentioning

confidence: 99%

Charge carrier mobility in disordered organic blends for photovoltaics

Koster

2010

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…All of our present experiments described in this paper meet this requirement. Thus, the yield of photocarrier generation can be calculated by eq 2. , where I TOF ( t ) is the transient photocurrent, Q c the collected charges, I 0 the laser energy per pulse, T tr the transmittance of Al electrode (30%), ν the frequency of used laser light; e the unit charge, h Planck's constant, and T the end time of measurement at which the photocurrent becomes zero.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the yield of photocarrier generation can be calculated by eq 2. 8,22 Light Intensity Dependence. The dependence of the photocarrier generation on the light intensity can provide us important information concerning the formation and relaxation of exciton.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Photocarrier Generation in Smectic Phenylnaphthalene Liquid Crystalline Photoconductor

Zhang

Hanna

1999

J. Phys. Chem. B

View full text Add to dashboard Cite

The intrinsic hole photogeneration process in different phases of a smectic liquid crystalline photoconductor, 2-(4′-octylphenyl)-6-dodecyloxynaphthalene (8-PNP-O12) was investigated as a function of electric field and light intensity by using the time-of-flight transient photocurrent technique. The collected photogeneration charges were found to be approximately proportional to the square of the light intensity irrespective of the phases. A model assuming Onsager type of carrier generation involving double-exciton interaction process, gave a good agreement with the obtained experimental results. The molecular ordering is found to promote the dissociation of the electron-hole pairs. The thermalization distance, r 0 , was very large and comparable with those in molecular crystals such as anthracene, indicating that the carrier generation process in smectic mesophases is analogous to that in organic molecular crystals rather than that in organic liquids.

show abstract

“…Several other models, which include the field-dependent mobilities [11,[15][16][17] and Langevin recombination mechanisms [11,15,17,18], have also been proposed to explain the experimental results. Contacts have been found to play important roles in some material systems also [8,19,20].…”

Section: Introductionmentioning

confidence: 99%

Electron injection and transport mechanism in organic devices based on electron transport materials

Khan

Khizar-ul-Haq

et al. 2008

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Electron injection and transport in organic devices based on electron transport (ET) materials, such as 4,7- diphyenyl-1,10-phenanthroline (Bathophenanthroline BPhen), 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (Bathocuproine BCP) and bipyridyl oxadiazole compound 1,3-bis [2-(2,2′-bipyridin-6-yl)-1,3,4-oxadiazol-5-yl]benzene (Bpy-OXD), have been reported. The devices are composed of ITO/ET materials (BPhen, BCP Bpy-OXD)/cathodes, where cathodes = Au, Al and Ca. Current–voltage characteristics of each ET material are performed as a function of cathodes. We have found that Ca and Al exhibit quite different J–V characteristics compared with the gold (Au) cathode. The current is more than one order of magnitude higher for the Al cathode and more than three orders of magnitude higher for Ca compared with that of the Au cathode at ∼8 V for all ET materials. This is because of the relatively low energy barrier at the organic/metal interface for Ca and Al cathodes. Electron-only devices with the Au cathode show that the electron transfer limitation is located at the organic/cathode interface and the Fowler–Nordheim mechanism is qualitatively consistent with experimental data at high voltages. With Ca and Al cathodes, electron conduction is preponderant and is bulk limited. A power law dependence J ∼ Vm with m > 2 is consistent with the model of trap-charge limited conduction. The total electron trap density is estimated to be ∼5 × 1018 cm−3. The critical voltage (Vc) is found to be ∼45 V and is almost independent of the materials.

show abstract

Electron Transport in 1,3-Bis(dicyanomethylene)indans

Cited by 6 publications

References 45 publications

Charge carrier mobility in disordered organic blends for photovoltaics

Charge carrier mobility in disordered organic blends for photovoltaics

Photocarrier Generation in Smectic Phenylnaphthalene Liquid Crystalline Photoconductor

Electron injection and transport mechanism in organic devices based on electron transport materials

Contact Info

Product

Resources

About