Using the time-of-flight photocurrent measurements, the hole transport properties of polarized 2-methoxy, 5-(2'-ethyl-hexyloxy)-1,4-phenylene vinylene (MEH-PPV) were investigated. Electric induced polarization of MEH-PPV can significantly enhance the mobility of hole. The hole mobility of the MEH-PPV film fabricated under the presence of vertical electric field is about three times larger than that prepared without field. (c) 2006 Elsevier B.V. All rights reserved.