ACTIVE SOLAR CONCENTRATOR WITH MULTI-JUNCTION DEVICES

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An active solar concentrator including a horizontally oriented structure including light directing portions with partially reflective surfaces directing light vertically impinging thereon into a central area and a solar module positioned in the central area to receive light from the partially reflective surfaces. The light directing portions each including at least one layer of rare earth oxide designed to up-convert light passing therethrough and positioned to receive light directly and/or from an outer light directing portion. The solar module may include a plurality of multi junction solar cells formed on a common substrate.