Abstract
We report the performances of planar organic photovoltaics (OPVs) using a low bandgap polymer (PTB7) as a donor (D) and three perylenetetracarboxylic diimide derivatives with different substituents on the nitrogen atoms, phenylethyl (PEPTC), (4-fluorophenyl)ethyl (4FPEPTC), and (4-methoxyphenyl)ethyl (4MeOPEPTC) as acceptors (A). These acceptors with different dipolar moments at the end group are expected to exhibit different interactions with the underlying PTB7 layer. An anomalous low open-circuit voltage (Voc) in the OPV with PTB7/4FPEPTC was obtained due to the orientation of dipolar moments at the D/A interfaces induced by the orientation of 4FPEPTC with 4-fluorophenyl groups. On the other hand, although the terminal 4-methoxyphenyl group in 4MeOPEPTC has a dipole moment in the opposite direction to the terminal 4-fluorophenyl group in 4FPEPTC, the expected large Voc was not obtained in the OPV with PTB7/4MeOPEPTC due to the disorientation of 4MeOPEPTC at the D/A interface.
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