POS5-0574
Impact of Backbone Regioregularity on the Conformation and Aggregation Behavior of PTQ11 Copolymers
When and Where
Nov 30, -0001
00:00 - 00:00
Presenter(s)
Hyeonwoo Jung (RIKEN)
Co-Author(s)
Abstract
Donor-acceptor (D-A) conjugated polymers have emerged as promising semiconducting materials for organic electronic devices owing to their solution processability, mechanical flexibility, and broad structural tunability. Among them, PTQ11, a quinoxaline-based D-A copolymer, has attracted significant attention as a representative polymer donor for non-fullerene organic solar cells because of its simple molecular structure, favorable molecular packing, and high photovoltaic performance. However, conventional PTQ11 synthesized by copolymerization is inherently regioirregular, as the asymmetric substitution pattern of the quinoxaline unit generates different orientation sequences along the polymer backbone. Despite the excellent photovoltaic properties of PTQ11-based polymers, the influence of quinoxaline orientation sequence and backbone regioregularity on polymer conformation and aggregation behavior has rarely been examined.
Herein, we report the synthesis of regioregular PTQ11 analogues with controlled quinoxaline orientation sequences to investigate the role of backbone regioregularity in quinoxaline-based donor–acceptor copolymers. The resulting polymers were systematically characterized in terms of their optical properties, aggregation behavior, backbone conformations, and electronic properties using variable-temperature UV–vis absorption and NMR spectroscopy, photoemission yield spectroscopy, and grazing-incidence wide-angle X-ray scattering. The results show that the regioregularity of PTQ11 significantly affects the electronic properties of the polymers through marked differences in polymer conformation and aggregation behavior. This study provides new insight into the role of regioregularity in governing the conformational and aggregation behavior of donor–acceptor conjugated polymers and offers a molecular design strategy for controlling polymer conformation in organic electronic materials.
Herein, we report the synthesis of regioregular PTQ11 analogues with controlled quinoxaline orientation sequences to investigate the role of backbone regioregularity in quinoxaline-based donor–acceptor copolymers. The resulting polymers were systematically characterized in terms of their optical properties, aggregation behavior, backbone conformations, and electronic properties using variable-temperature UV–vis absorption and NMR spectroscopy, photoemission yield spectroscopy, and grazing-incidence wide-angle X-ray scattering. The results show that the regioregularity of PTQ11 significantly affects the electronic properties of the polymers through marked differences in polymer conformation and aggregation behavior. This study provides new insight into the role of regioregularity in governing the conformational and aggregation behavior of donor–acceptor conjugated polymers and offers a molecular design strategy for controlling polymer conformation in organic electronic materials.
