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Revealing Order and Disorder in Films and Single Crystals of a Thiophene-Based Oligomer by Optical Spectroscopy

Titelangaben

Motamen, Sajedeh ; Raithel, Dominic ; Hildner, Richard ; Rahimi, Khosrow ; Jarrosson, Thibaut ; Serein-Spirau, Françoise ; Simon, Laurent ; Reiter, Günter:
Revealing Order and Disorder in Films and Single Crystals of a Thiophene-Based Oligomer by Optical Spectroscopy.
In: ACS Photonics. Bd. 3 (2016) Heft 12 . - S. 2315-2323.
ISSN 2330-4022
DOI: 10.1021/acsphotonics.6b00473

Angaben zu Projekten

Projektfinanzierung: Deutsche Forschungsgemeinschaft

Abstract

Depending on processing conditions, ordered microstructures of conjugated oligomers or polymers exhibit variable amounts of grain boundaries, lattice disorder, and amorphous (disordered) regions. These structural details can be determined very precisely. Their correlations with optical or electronic properties, however, are very difficult to establish, because, for example, optical spectra are usually averaged over regions with different degrees of disorder. In an attempt to facilitate the interpretation of optical spectra, we performed systematic studies on thin films and μm-sized single crystals of thiophene-based conjugated molecules, which allowed identify- ing the relative contributions of ordered and disordered regions in optical emission spectra. A detailed multipeak analysis of the emission spectra showed that the peak positions, the energies of the emitted photons, showed only minor changes, independent if highly ordered or rather disordered samples were examined. However, the relative emission intensity changed significantly between samples. In particular, for highly ordered single crystals the purely electronic 0−0 transition nearly vanished, that is, it was essentially optically forbidden as theoretically predicted. Thus, changes in emission probability are correlated with the degree of structural order in semiconducting conjugated systems and provide a possibility to quantify structural order.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Keywords: anisotropic behavior; degree of structural order; local spectroscopy; order; organic conjugated oligomer; single crystal
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut > Lehrstuhl Experimentalphysik IV
Profilfelder > Advanced Fields > Polymer- und Kolloidforschung
Forschungseinrichtungen > Forschungszentren > Bayreuther Institut für Makromolekülforschung - BIMF
Graduierteneinrichtungen > Bayreuther Graduiertenschule für Mathematik und Naturwissenschaften - BayNAT > Fotophysik synthetischer und biologischer multichromophorer Systeme
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Physikalisches Institut
Profilfelder
Profilfelder > Advanced Fields
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Graduierteneinrichtungen
Graduierteneinrichtungen > Bayreuther Graduiertenschule für Mathematik und Naturwissenschaften - BayNAT
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 28 Apr 2017 08:57
Letzte Änderung: 28 Apr 2017 08:57
URI: https://eref.uni-bayreuth.de/id/eprint/36884