Compare to acceptor, there are more researches and diversities of donor. In general, here are some points when designing donor materials: (1) Ideal bandgap (from 1.3 eV to 1.8 eV [4]) in order to make the absorption spectrum to fit the solar spectrum to reach the most effective photoelectric transformation. (2) Proper LUMO level. The LUMO of donor must be higher than the LUMO of acceptor, which could make electrons to separate successfully. ...
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