Abstract
It has been predicted that under certain conditions a multilayer sandwich structure consisting of alternating close‐spaced layers of two semiconductors of different energy gap will exhibit intriguing transport and optical properties, including a negative resistance. This type of structure has been created with a specially designed vapor growth system, wherein the composition is made to alternate many times between and with a period as small as 110Aå. The presence of the repetitive structure has been confirmed by electron microscopy on cleaved and etched cross sections and by x‐ray diffraction. The uniformity of spacing, as well as the period, is of prime importance. The effects of crystal orientation and reactant gas composition on this property are described.
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