Energy-dependent dielectric tensor axes in monoclinic -3,4,9,10-perylene tetracarboxylic dianhydride
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 imagi...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/287148 |
| Acceso en línea: | http://hdl.handle.net/10261/287148 |
| Access Level: | acceso abierto |
| Palabra clave: | Monoclinic dielectric tensor Perylene tetracarboxylic dianhydride Chromatic dispersion of tensor axes Generalized ellipsometry Electronic structure of organic semiconductor |
| Sumario: | 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 |
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