| Pacific Rim Symposium on Surfaces, Coatings and Interfaces (PacSurf 2018) | |
| Energy Harvesting & Storage | Wednesday Sessions |
| Session EH-WeM |
| Session: | Efficient Power Conversion/Cells |
| Presenter: | Dusan Velic, Comenius University, Bratislava, Slovakia |
| Authors: | L. Slusna, Comenius University, Bratislava, Slovakia L. Haizer, International Laser Center, Bratislava, Slovakia E. Jane, Institute of Chemistry, Slovak Academy of Sciences, Bratislava, Slovakia D. Bondarev, Polymer Institute, Slovak Academy of Sciences, Bratislava, Slovakia V. Szocs, International Laser Center, Bratislava, Slovakia M. Drzik, International Laser Center, Bratislava, Slovakia E. Noskovicova, Comenius University, Bratislava, Slovakia D. Lorenc, International Laser Center, Bratislava, Slovakia M. Jerigova, Comenius University, Bratislava, Slovakia D. Velic, Comenius University, Bratislava, Slovakia |
| Correspondent: | Click to Email |
Currently, the most important applications for polythiophenes are in the area of solar cells, thin-film transistors, light-emitting diodes, sensors and nonlinear optics with low-cost and low-temperature processing [1]. On the other hand, polythiophenes show a great promise also in the area of nonlinear optics and photonics [2] with enhanced second and third order nonlinearities. Hence, dynamics of polythiophenes gained an increased interest, because it is providing detailed understanding of the complex processes occurring in π-conjugated polymers.
A novel copolymer (poly(thiophene-2,5-diyl-2,5-di-n-octyloxycarbonyl-1,4-phenylene)) denoted as P33 is introduced as a potential material for photovoltaics. P33 dissolved in chloroform was investigated by steady-state absorption, linear/non-linear fluorescence spectroscopies and time-resolved fluorescence spectroscopy.
Molar extinction coefficient of P33 was determined as 18315 cm-1.M-1. The P33 fluorescence quantum yield and P33 singlet fluorescence lifetime were determined as 0.4 and 810 ps, respectively. The P33 fluorescence fast decay component shows decay times of 1.2 ps, 2.0 ps, and 0.5 ps for increasing wavelengths of 480 nm, 500 nm, and 520 nm, respectively. The fast component has been previously attributed to transport of nearly instantaneously formed excitons to localized states known as downhill energy transfer. Multi-photon excited fluorescence has been observed for the P33 solutions in chloroform and for 800 nm and 1200 nm pumping. The P33 TPA cross-section was evaluated as 6.9 GM. This spectroscopic study provides basic fluorescence characteristics of the novel thiophene copolymer P33.
This work was supported by VEGA 1/0400/16 .
References
[1] I. Etxebarria, J. Ajuria, R. Pacios, Solution-processable polymeric solar cells: A review on materials, strategies and cell architectures to overcome 10%. Org. Electron. 19 (2015) 34–60.
[2] P. N. Prasad and D.J. Williams, Introduction to Nonlinear Optical Effects in Molecules and Polymers, John Wiley & Sons, New York, 1991, ISBN 0‐471‐51 562‐0