The inventive device is used for carrying out a voltaic conversion at a high spectral irradiance comprising i) at least one photovoltaic cell (CH) consisting of an lower side provided with a conductive layer (CC) and a top side (FSC) provided with a carrier collecting grid (G), ii) at least one protective screen (EP) arranged above the cell (CP) and limiting means (SC) used for limiting a incident radiation access to the cell (CP) in such a way that the thermal heating thereof is reduced when the device (D) is exposed to a high incident radiation of a known spectrum.
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