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Revealing structure formation in PCPDTBT by optical spectroscopy

Title data

Scharsich, Christina ; Fischer, Florian S. U. ; Wilma, Kevin ; Hildner, Richard ; Ludwigs, Sabine ; Köhler, Anna:
Revealing structure formation in PCPDTBT by optical spectroscopy.
In: Journal of Polymer Science Part B: Polymer Physics. Vol. 53 (29 July 2015) Issue 18 . - 15 S..
ISSN 1099-0488
DOI: https://doi.org/10.1002/polb.23780

Official URL: Volltext

Abstract in another language

The low-bandgap polymer poly{[4,4-bis(2-ethylhexyl)-cyclopenta-(2,1-b;3,4-b′)dithiophen]-2,6-diyl-alt-(2,1,3-benzo-thiadiazole)−4,7-diyl} (PCPDTBT) is widely used for organic solar cell applications. Here, we present a comprehensive study of the optical properties as a function of temperature for PCPDTBT in solution and in thin films with two distinct morphologies. Using absorption and photoluminescence spectroscopy as well as Franck-Condon analyses, we show that PCPDTBT in solution undergoes a phase transformation at 300 K from a disordered to a truly aggregated state on cooling. The saturation value of aggregates in solution is reached in PCPDTBT thin films at any temperature. In addition, we demonstrate that the photophysical properties of the aggregates in films are similar to those in solution and that a low percentage of thermally activated excimer states is present in the films at temperatures above 200 K

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 06 Aug 2015 06:47
Last Modified: 06 Aug 2015 06:47
URI: https://eref.uni-bayreuth.de/id/eprint/17586