摘要
Record-breaking organic solar cells(OSCs)based on blends of polymer donors and small molecule acceptors often show undesirable degradati on,which severely precludes their practical use.Herei n,we demonstrate a facile and cost-effective approach to con struct thermally stable OSCs at 150℃ by incorporating a small amount of a polymer insulator polyacenaphthylene(PAC)with high glass-transition temperature over 230℃ into polymer:acceptor blends.The model PTB7-Th:EH-IDTBR blend with 10 wt%PAC maintained above 85%of its initial efficiency upon continuous heating at 150℃ for over 800 h,while the efficiency of the blend without PAC sharply dropped by 70%after-300 h.Owing to high miscibility with acceptors,PAC confines the motion of the acceptor molecules and suppresses the acceptor crystallization at elevated temperatures,leading to significantly improved stability.Importantly,the effectiveness of this blending approach was also validated in many other OSC systems,showing great potential for achieving high-performance thermally stable electronics.
基金
supported by the National Natural Science Foundation of China(Nos.52073207,22075200,and 51703158)
L.Y.expresses thanks for the start-up grant of Peiyang Scholar program from Tianjin University and the Open Fund of the State Key Laboratory of Luminesce nt Materials and Devices(South China University of Technology,No.2020-skllmd-11)
M.L.thanks the Peiyang Young Junior Faculty Program of Tianjin University(No.2019XRG-0021)
L.Y.acknowledges the merit beamtime(Project ID:15692)approved by the Australian Synchrotron and beamtime(Project ID:2020-BEPC-PT-004082)approved by Beijing Synchro-tron Radiati on Facility.
