Abstract. Existing CPV Technology Markets are not compliant with a standard configuration [1]. Concentrations vary from several suns to more than 1000 suns and the optical technology used could be very different. Nowadays, the market trends are moving toward more and more compact optical systems [2] in order to exploit the Light Emitting Diodes like approach [3]. The aim is to increase the optical efficiency by using an ultra-short focal distance and to have a better thermal management. Moreover the ratio between the efficiency and the weight is increasing and the solar cell size becomes sub-millimetric. Then, more severe mechanical tolerances are essential to keep an optimum optical alignment between the cells and the optics. A new process of micro-concentrator manufacturing is patented [4] and developed at CEA CPV laboratory. This process enables manufacturing and auto-aligning of Primary Optical Elements with Secondary Optical Elements and solar cells. A 275 suns micro-concentrator is manufactured with 0.819 mm² triplejunction cells and molded silicone optics. An efficiency of 29.7% is measured with an acceptance angle of ± 0.7°.

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