High efficient organic ultraviolet (UV) photovoltaic devices comprising 4,4',4 ''-tri-(2-methylphenyl phenylamino) triphenylamine (m-MTDATA) and tris-(8-hydroxyquinoline) gallium (Gaq(3)) as the electron donor and acceptor, respectively, are demonstrated. The m-MTDATA/Gaq(3) bilayer device shows a short-circuit current density of 59.3 mu A/cm(2), a open-circuit voltage of 1.85 V. a fill factor of 0.41, and a power conversion efficiency of 3.74% under illumination of a 1.2 mW/cm(2) 365 nm UV light. And this power conversion efficiency is superior than that of the device based on tris-(8-hydroxyquinoline) aluminum with the same device structure, which is attributed to the high electron mobility of Gaq(3) and the low exciton loss via radiation decay and hence more exciton dissociation in m-MTDATA/Gaq(3) device. (C) 2010 Elsevier Ltd. All rights reserved.