| 摘要 |
<p>A photovoltaic solar system (1) for the production of electricity from direct solar radiation includes a dispersive concentrator (2) incorporating in a first portion (4) thereof a plurality of optically parallel prismatic elements (7) which vary in cross-section or index of refraction, and incorporating in a second portion (5) thereof focusing means (15). The radiation (R) passing from the prismatic elements (7) into the second portion of the dispersive concentrator is subjected to an initial dispersion, and that dispersed radiation is further dispersed (37, 38, 39 or 47, 48, 49, 50), and also focused and concentrated, on leaving the focusing means. The system also incorporates a multijunction photovoltaic cell (3) with at least two optically parallel component photovoltaic cells (27, 28, 29, 30) differing in their energy bandgap values and positioned to receive, either directly or via secondary focusing means (34), the dispersed and focused radiation coming from the dispersive concentrator. The dispersed radiation incident on the component photovoltaic cells is distributed such that longer wavelength radiation is incident on those cells with smaller energy bandgap values and that shorter wavelength radiation is incident on those cells with larger energy bandgap values.</p> |
