Last modified: 2018-07-21
Abstract
New copolymer involving poly (9-vinylcarbazole) and Poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT) for optoelectronic devices: Synthesis, characterization and modeling
Mbarek Mohamed*1, Alimi Kamel1
1 Unitde Recherche: Matiaux nouveaux et Dispositifs Electroniques Organiques (UR 11ES55) Facultdes Sciences de Monastir, Universitde Monastir-Tunisie.
*Corresponding author: mohamedmbarek99@yahoo.fr
ABSTRACT
New donor-acceptor basedcopolymer incorporatingPVK aselectron donor molecule andF8BT as electron withdrawing one has been designed and synthesized fororganic solar cells applications.
The grafting of F8BT was elucidated by IR, Raman spectroscopy. The photo-emissive properties of new copolymer were examined by the means of UV-VIS and photoluminescence measurements. The resulting copolymer exhibits original optical properties compared to the PVK and F8BT ones. The red shifting in PL and absorption spectra showing an extension of conjugation length. A complementary study using theoretical calculations based on density functional theory (DFT) and time-dependant density functional theory (TD-DFT) methods were performed to examine the results copolymers. Then,Highest Occupied Molecular Orbital (HOMO) andLowest Unoccupied Molecular Orbital (LUMO) levels have been calculated in order to elucidate the intramolecular charge transfer (ICT) between theelectron acceptor and the electron donor moieties and to establish the energetic diagrams of PVK-based copolymer. All results showed that this copolymer exhibit interesting photophysical properties and shows promisingphotovoltaic trends.. .