Electronic band structure of organic molecules naphtalene-1,4,5,8-tetracarb
oxylic- dianhydride (NTCDA), perylene-3,4,9,10-tetracarboxylicdianhydride (
PTCDA), and perylene was studied by total current spectroscopy. It is shown
how fragments of the molecules determined the density of states structure
in the conduction band. The comparison between experimental and calculated
data for perylen displaced good agreement.