STRUCTURE AND MORPHOLOGY OF COPPER TETRA-TERT-BUTYLPHTHALOCYANINE LANGMUIR-BLODGETT-FILMS

Structure and morphology of copper tetra-tert-butylphthalocyanine (Cu- tert-Bu4PC) Langmuir-Blodgett films were investigated using transmissi on electron microscopy (TEM), transmission electron diffraction (TED), X-ray diffraction and light microscopy. TED fringes showed in-plane u niaxial texture with preferential orientation of molecular planes perp endicular to the compressing direction. TEM micrographs revealed small worm-like crystalline domains (10-30 nm in length) densely stacked in a presumably amorphous matrix. According to the TED patterns, two pri ncipal perpendicular periods characterize the in-plane stacking: 0.332 nm and 1.8 nm. Using computer simulation a 'zig-zag' molecular packin g of the most frequent isomers was found to be consistent with these d istances as well as with the observed value of area per molecule in de posited molecular films (0.5-0.7 nm2).