Abstract
Developing narrow-bandgap organic semiconductors is important to facilitate the advancement of or-ganic photovoltaics(OPVs).Herein,two near-infrared non-fused ring acceptors(NIR NFRAs),PTBFTT-F and PTBFTT-Cl have been developed with A-πA-π D-D-πD-πA-A non-fused structures.It is revealed that the introduction of electron deficient π-bridge(πA)and multiple intramolecular noncovalent interac-tions effectively retained the structural planarity and intramolecular charge transfer of NFRAs,extending strong NIR photon absorption up to 950 nm.Further,the chlorinated acceptor,with the enlarged π-surface compared to the fluorinated counterpart,promoted not only molecular stacking in solid,but also the desirable photochemical stability in ambient,which are helpful to thereby improve the exciton and charge dynamics for the corresponding OPVs.Overall,this work provides valuable insights into the design of NIR organic semiconductors.
基金项目
国家自然科学基金(22125901)
National Key Research and Devel-opment Program of China(2019YFA0705900)
中央高校基本科研业务费专项(226-2023-00113)
NETL
NSTL
万方数据