Number 144 (Story #3), September 20, 1993 by Phillip F. Schewe and Ben Stein ORGANIC SUPERLATTICE STRUCTURE has been observed directly for the first time in a material grown with molecular beam deposition techniques. The structures, made by scientists at Hitachi in Japan, consist of many nm-thick alternating layers of copper phthalocyanine and another organic semiconductor called NTCDA. Electron microscope pictures of the material reveal the thinness and uniformity of the layers. The strain that arises at the boundary between layers owing to the lattice mismatch of the two compounds may be less for organic than for inorganic materials, making it possible for greatly different species to sit well together. Scientists expect that versatile organic compounds can be combined in different multi-quantum-well structures to produce unique opto-electronic properties. (Y. Imanishi et al., 27 Sept. 1993 Physical Review Letters.)