Improving photovoltaic properties via electric-field-induced orientation of conjugated polymer

摘要

A high electric field is applied to polarize the undoped MEH-PPV and the MEH-PPV:C-60 composite thin film in the process of spin-coating. Due to the polarization causing the orientation of the MEH-PPV chains, the resulting thin-film devices show improved photovoltaic properties. For undoped MEH-PPV devices, oriented under the electric field of 6 x 103 V cm(-1), the short-circuit current (J(sc)) and the external quantum efficiency (EQE) are enhanced by a factor of 2.5 and 2, respectively. For MEH-PPV-fullerene composite devices, oriented under the same field, the J(sc) and the EQE are improved by a factor of 1.8 and 1.7, respectively. (c) 2006 Elsevier Ltd. All rights reserved.