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A new universal principle of selective registration of electromagnetic radiation by means of silicon-based solid-state two-barrier structures is studied. In such structures, due to the interaction of oppositely directed photocurrents caused by potential barriers, it becomes possible to selectively register narrow spectral regions selected from the integral radiation flow, as well as to define the unknown length of a monochromatic wave. The influence of the base width and of outside-the-base areas of the two-barrier structure on photocurrent behaviour and on spectrophotometric properties of the photo-detector is studied.

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