第一，对于基于D-A结构的非富勒烯受体分子而言，在兼顾获得高开路电压光

First, for non-fullerene acceptor molecules based on the DA structure, under the premise of obtaining high open circuit voltage photovoltaic cells, by reducing the terminal group's ability to withdraw electrons, the HOMO energy level can be kept basically unchanged. Effectively enhance the molecular LUMO energy level, thereby broadening its optical band gap.

First, for non fullerene receptor molecules based on D-A structure, on the premise of obtaining high open circuit voltage photovoltaic cells, by reducing the electron pulling ability of terminal groups, we can effectively improve the molecular LUMO level and broaden its optical band gap on the basis of keeping the Homo level basically unchanged.<br>

First, for non-fullerene receptor molecules based on D-A structure, on the premise of obtaining high open-circuit voltage photovoltaic cells, by reducing the terminal Kira electron ability, the LUMO energy level of molecules can be effectively increased while keeping the HOMO energy level basically unchanged, and then the optical band gap can be widened.