Surface morphology of organic thin films

Highly oriented thin films of tetrathiafulvalene tetracyanoquinodimethane TTF-TCNQ.and of p-nitrophenyl nitronyl nitroxide p-NPNN.have been grown on alkali halide substrates by vapor deposition techniques. Their surfaces reveal clearly differentiated morphologies, as measured with tapping mode atomic force microscopy TMAFM., exhibiting different kinds of defects. However, the films order in similar layered molecular structures parallel to the substrate plane. q1999 Elsevier Science B.V. All rights reserved.