DIRECT OBSERVATION OF AN ORGANIC SUPERLATTICE STRUCTURE

Organic multilayered thin films of copper phthalocyanine (CuPc) and ha lene-1,4,5,8-tetracarboxylic-1,8:4,5-dianhydride were fabricated by an organic molecular beam deposition technique. The analyses by an x-ray photoelectron spectroscopy and a transmission electron microscopy dir ectly revealed an alternating layer-by-layer structure, with a few nan ometers thickness for each layer. The optical absorption spectra at th e Q band for CuPc layers indicates an extraordinary electronic state i n an organic superlattice structure.