High photogeneration efficiency of charge-transfer complexes formed between low ionization potential arylamines and C-60

Photogeneration of carriers was measured at 633 nm in a series of polymer c omposites based on polystyrene, doped with a triphenyldiamine derivative as hole transport molecule and C-60 as sensitizer. Light absorption and gener ation of mobile carriers was achieved through the charge-transfer (CT) comp lex formed between the hole transport molecule and the sensitizer. We discu ss the influence of the ionization potential of the hole-transport molecule on the photogeneration efficiency of the CT complex it forms with the sens itizer C-60. Photogeneration efficiency of unity at an applied electric fie ld of 55 V/mu m is found in one composite. (C) 2000 American Institute of P hysics. [S0021-9606(00)70221-2].