A semiconductor structure, for improving rectifier efficiency in passive backscatter transponders or backscatter remote sensors for use in high-frequency electromagnetic fields, is provided. The semiconductor structure has a dielectric layer on whose upper side is arranged a first electrically conductive layer, and a second electrically conductive layer that is spaced apart from the first electrically conductive layer and is arranged essentially below the first electrically conductive layer and is at least partially embedded in the dielectric layer. The dielectric layer has its lower side arranged on a semiconductor substrate of a first conductivity type within which is formed a more highly doped first zone of the first conductivity type which surrounds an even more highly doped second zone of the first conductivity type connected to a reference voltage. Whereby, the first zone can be arranged essentially completely under the first and second electrically conductive layers. In this way, interfering effects of parasitic circuit components can be reduced.