|
Authors
|
Alonso, M. I. ; Garriga, M. ; Ossó, J. O. ; Schreiber, F. ; Scholz, R.
|
|
Title
|
Energy-dependent dielectric tensor axes in monoclinic a-3,4,9,10-perylene tetracarboxylic dianhydride
|
|
Date
|
01.03.2023
|
|
Number
|
61265
|
|
Abstract
|
We have determined the complex dielectric tensor of single crystalline 3,4,9,10-perylene tetracarboxylic dianhydride (-PTCDA) as a function of energy in the range between 1.4 and 5.0 eV. The results obtained reflect the monoclinic symmetry of the crystal: The principal axes of the real and the imaginary part of the tensor in general do not coincide and show chromatic dispersion. Monoclinic behavior allows rotation of the components · and · in the plane perpendicular to the unique symmetry axis . The experimental results indicate that the energies of the optical transitions observed in the weak · component coincide with energies in which a resonance effect due to coupling with the stronger · component occurs. These resonances appear at energies close to electronic excitations such as the optical gap, the transport gap and the highest occupied molecular orbital–lowest unoccupied molecular orbital (HOMO–LUMO) peak-to-peak gap and their assignments are discussed based on theoretical calculations.
|
|
Publisher
|
Elsevier
|
|
Wikidata
|
|
|
Citation
|
Thin Solid Films 768 (2023) 139686
|
|
DOI
|
https://doi.org/10.1016/J.TSF.2023.139686
|
|
Tags
|
|
