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Optical Properties of Nano-Rods PTCDA Thin Films: an Important Material for Optoelectronic Applications |
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PP: 1-14 |
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Author(s) |
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S. AlFaify,
Y. S. Rammah,
H. Y. Zahran,
F. Yakuphanoglu,
Mohd. Shkir,
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Abstract |
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| Thin films of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) of different thicknesses (155, 230, 354, and 470 nm) are
prepared using thermal evaporation method. The XRD pattern confirms that the this films are preferentially grown along (102) direction.
The morphology was studied by AFM and showed that the prepared films are nanocrystalline in nature consisting rod like nano-particles
grains. The average grain’s size was fond to be 44.5 nm with RMS (root mean square) surface roughness of 11.6 nm. The optical properties
was studied in the wavelength range of 300-2600 nm. Further the collected data of transmittance T(λ) and reflectance R(λ) coefficients
was used to calculate its refractive and absorption (n & k) indices. The dielectric (ε1 & ε2), dissipation factor ( tan ), optical conductivity
( opt ), optical band gap (
opt
g E ), volume energy loss (VELF) and surface energy loss (SELF) functions are calculated and discussed.
Owing to the measured optical absorption data of the film, there are four indirect band gaps ranging from 1.88 to 3.45eV. Overall, the
obtained data suggests that the PTCDA film can serve as potential materials for optoelectronic devices. |
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