POS1-0969
Selenophene-Substituted BDT-Based Copolymers: Implications for Molecular Packing and Charge Transport
When and Where
Nov 30, -0001
12:00am - 12:00am
Presenter(s)
Vioreta Aprilia Pramitania (Gyeongsang National University)
Co-Author(s)
Abstract
Molecular packing gives a crucial role in determining the charge transport performance of conjugated polymers used in organic electronic devices. This study investigates the effect of replacing thiophene with selenophene in benzo[1,2-b:4,5-b’]dithiophene (BDT)-based donor-acceptor copolymers and influence on molecular packing and charge transport properties. Two donor-acceptor copolymer, PBDTT-TPD and PBDTSe-TPD, were synthesized and characterized to evaluate the relationship between chemicals structure, molecular organization, and charge carrier mobility. Optical and electrochemical analyses showed that the incorporation of selenophene reduced the optical bandgap, leading to red-shifted absorption and indicating enhanced electronic delocalization along the polymer backbone. Structural analysis further revealed a higher degree of molecular ordering and more favorable packing in the solid state. These structural advantages translated directly into superior charge transport behavior, as confirmed by organic field-effect transistor measurements. As a result, the selenophene-containing polymer exhibited substanstially improved hole transport performance compared with its thiophene equal. The enhanced performance is attributed to the higher polarizability and large atomic radius of selenium, which facilitate tighter packing and more efficient charge transfer pathways. Overall, this study demonstrates that selenophene incorporation is an effective molecular design strategy for improving the optoelectronic properties and charge transport characteristics of BDT-based conjugated polymers, making them promising candidates for advanced organic semiconductor applications.
