摘要
Carbon-oxygen-bridged (CO-bridged) ladder-type units already proved to be promising electron-donating building blocks for making acceptor-donor-acceptor (A-D-A) nonfullerene acceptors [1].Compared with traditional carbon-bridged (C-bridged) units, CObridged units present stronger electron-donating capability due to electron-rich oxygen atoms.
基金
supported by the National Key Research and Development Program of China(2017YFA0206600)
the National Natural Science Foundation of China(51773045,21572041 and21772030)
the Youth Association for Promoting Innovation(CAS)