a ball mill and the resulting dispersion was coated by means of a doctor blade on a polyester film deposited with aluminum through vacuum evaporation and was subjected to natural drying whereby there was formed a 1 u03bc thick charge carrier generating layer meanwhile another dispersion was prepared by mixing 2 parts by weight of 2 4 7 trinitro 9 fluorenone 2 parts by weight of polycarbonate namely panlite l the manufacture of teijin co ltd and 46 parts by weight of tetrahydrofuran together and this dispersion was coated on the foregoing charge carrier generating layer by means of a doctor blade and then dried at a temperature of 100 u00b0 c for 10 minutes to form a 10 u03bc thick charge transfer medium layer whereby there was obtained a photosensitive material having a structure illustrated in fig3 when the thus obtained photosensitive material was subjected to the same measurement as in example 181 the result was as follows varieties of photosensitive materials having a structure illustrated in fig3 were prepared by applying the same procedure as in example 221 save for employing the respective disazo compounds referred to by number in the following table 23 in place of the disazo compound no 1d used in example 221 when these photosensitive materials were subjected to the same measurement of vpo and e1 2 as in example 181 the result was as shown in table 23 respectively table 23______________________________________ disazoexample compound vpo el 2no no volt.