| abstract |
A photosensitive element for electrophotography has an electrically conductive substrate (1) and a layer structure (2,3) thereon comprising a charge generating substance and a charge transport substance. An improved charge transport substance is a derivative of triphenylamine in which at least 80% of the electrons in the highest occupied molecular orbital are located on the triphenylamine skeleton. Examples of such compounds have the following formula:n n wherein X is a an optionally substituted heterocyclic radical containing at least one ring nitrogen, Q is a single bond or ―C=C―, and Z₁, Z₂ and Z₃ are H, lower alkyl or alkoxy, aryl, NO₂, CF₃, ―N(R′)₂, ―S-C₆H₅ or ―S(R′)₂. |