Experimental determination of the attenuation length of electrons in organic molecular solids: The example of PTCDA

Compared to calculations which we performed applying the TPP2M formula the results show the expected offset which is due to the additional elastic contribution in the measured values. Furthermore, a comparison with the widely used “universal curve” [1] shows that this description does not match the data on PTCDA very well. However, the curvature of the theoretical curve derived from the TPP2M approach [2] matches or our experimental EAL data reasonably good.