Preparation and Characterization of 3,4,9,10-Perylenetetracarboxylic dianhydride (PTCDA) Films Deposited by Organic Molecular Beam Deposition Method

Fuchigami, Hiroyuki; Tanimura, Sachiko; Uehara, Yasushi; Kurata, Tetsuyuki; Tsunoda, Sei

doi:10.1143/jjap.34.3852

Cited by 28 publications

(31 citation statements)

References 17 publications

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“…14 Additionally PTCDA has been shown to be a very good optical waveguide material, possessing a large refractive index ͑2.0͒ and low optical loss at near-infrared wavelengths along the molecular planes. 15 Similar findings have been made subsequently by Ammermann and co-workers 16 and Fuchigami et al 17 We have fabricated a series of multilayer LED structures in order to reconfirm hole transport normal to the molecular …”

Section: B Light-emitting Diodessupporting

confidence: 81%

Conductivity-type anisotropy in molecular solids

Ostrick¹,

Dodabalapur²,

Torsi³

et al. 1997

Journal of Applied Physics

157

107

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Thin polycrystalline films of perylenetetracarboxylic dianyhydride ͑PTCDA͒, an organic molecular solid, exhibits substantial anisotropies in its electronic transport properties. Only electrons transport in the directions along molecular planes, while mainly holes transport in the direction normal to molecular planes. A series of measurements on both field effect transistors with PTCDA active layers and light emitting diodes with PTCDA transport layers documents the anisotropy seen in the electronic transport in thin films of PTCDA.

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Section: B Light-emitting Diodessupporting

confidence: 81%

Conductivity-type anisotropy in molecular solids

Ostrick¹,

Dodabalapur²,

Torsi³

et al. 1997

Journal of Applied Physics

157

107

View full text Add to dashboard Cite

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“…Figure 2 and 3 show the complex refractive indices parallel (x) and perpendicular (z) to the substrate plane as a function of the wavelength for Si and GaAs sample sets, respectively, resulting from the multiple sample analysis procedure. The additional data points present the real parts of the refractive index published in the literature for thicker PTCDA samples deposited on a quartz substrate [9] and on a 50 nm thick polycrystalline Au-film on glass [10]. Our results are in good agreement with the data from literature.…”

Section: Reflectance Anisotropy Spectroscopysupporting

confidence: 86%

“…In [8] the in-plane components of the real and imaginary part of the refractive index of polycrystalline PTCDA films grown on glass were obtained from normal incidence reflection and transmission measurements in the spectral region of 300-800 nm. The refractive index of thick PTCDA films at a fixed wavelength was also published [9,10].…”

Section: Introductionmentioning

confidence: 99%

Optical Anisotropy of Organic Layers Deposited on Semiconductor Surfaces

Kampen

Paraian

Rossów

et al. 2001

phys. stat. sol. (a)

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The optical properties of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) films grown by organic molecular beam deposition (OMBD) on passivated Si and GaAs substrates were determined using variable angle spectroscopic ellipsometry (VASE) and reflectance anisotropy spectroscopy (RAS). All PTCDA layers deposited at room temperature with a low deposition rate of about 0.2 nm/min are strongly optically anisotropic and are treated as uniaxial. From the VASE measurements the in-plane refractive indices and extinction coefficients are found to be larger than the respective out-of-plane optical constants in the spectral range from 300 nm (4.13 eV) to 1700 nm (0.73 eV). The altogether lower refractive indices of PTCDA films grown on GaAs indicate a lower density of the films which can be explained by the film structure. RAS results for PTCDA films grown on GaAs show features which can be attributed to transitions between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO). GaAs features near the E 1 gap remain unchanged upon PTCDA deposition indicating that the surface reconstruction of the GaAs substrate stays intact.

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“…Both the anisotropy and the absolute values at optical wavelengths are smaller for the films investigated in [14,15], which can be taken indicative of less compact material in the films compared to the single crystal. The presence of voids would both reduce the values of n and of the absolute anisotropy Dn.…”

Section: Optical Functionmentioning

confidence: 88%

Anisotropic optical properties of single crystalline PTCDA studied by spectroscopic ellipsometry

Alonso

Garriga

Karl

et al. 2002

Organic Electronics

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We report anisotropic spectra of 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) in the optical energy range 1.5-3.7 eV, measured at room temperature by spectroscopic ellipsometry. The results were obtained on single crystals of a-PTCDA grown by temperature gradient sublimation. Spectra were measured at highly symmetric positions of the plane of incidence relative to the sample crystallographic axes and are presented as pseudo-values of refractive index hni and extinction coefficient hki, which reflect a very large anisotropy of these optical functions. The spectroscopic properties of the excited states in the molecular plane (1 0 2) are analyzed; in particular, we identify clear Davydov splittings proving the formation of coherent excitons in the crystal. Out-of-plane, we observe a relatively narrow absorption peak at $2.9 eV that is ascribed to a charge-transfer transition. Ó

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Preparation and Characterization of 3,4,9,10-Perylenetetracarboxylic dianhydride (PTCDA) Films Deposited by Organic Molecular Beam Deposition Method

Cited by 28 publications

References 17 publications

Conductivity-type anisotropy in molecular solids

Conductivity-type anisotropy in molecular solids

Optical Anisotropy of Organic Layers Deposited on Semiconductor Surfaces

Anisotropic optical properties of single crystalline PTCDA studied by spectroscopic ellipsometry

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