123rd General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation for Young Polymer Scientists
Room No. Room 403
Time THU 10:24-10:36
Code POLY.O-8
Subject Polymer Aggregation Control of NDI-Based Conjugated Polymer with Improved Electrical Connection through Backbone Fluorination
Authors Seung Un Ryu, Yelim Choi, Taehyun Kim, Dohyun Kim1, Taiho Park2,*
Pohang University of Science and Technology, Korea
1Chemical engineering, Pohang University of Science and Technology, Korea
2Department of Chemical Engineering, Pohang University of Science and Technology, Korea
Abstract Naphthalene diimide (NDI)-based conjugated polymer with bithiophene (BT) or dithienylethene (TVT) are widely used in organic electronic devices as n-type materials and, in general, these can form large crystal domains through NDI-driven self-assembly. However, they still have limitations on improving electron transport mainly due to the lack of electrical connection between crystal domains. An interconnected network of weakly ordered aggregates with mixed orientation could provide an effective approach to increase the electron mobility of a polymer. We demonstrate the feasibility of approach using NDI-based polymer with TVT having fluorine in the 3-position instead of hydrogen (FTVT). FTVT unit enhances intermolecular interactions between polymer chains, leading to robust aggregation. This aggregation suppresses NDI-driven self-assembly to produce interconnected aggregates with short-range order and affords a reinforced film morphology at ele-vated temperature. This microstructure resulted in improved e of transistor devices by lowering energetic disorder as well as continuous electrical connection at different annealing temperatures.
E-mail ryuseungun93@postech.ac.kr