Processing of GaAs solar cells

The processability of GaAs solar cells using processes established for space-grade silicon solar cells was tested on a 140-piece sample. The welding parameters were adapted to the requirements of GaAs solar cells by a reduction of the welding time at increased voltage and improved electrode shape. The resulting degradation of the electrical characteristics after welding is comparable to those observed for Si solar cells. The yield of the production sample up to coupon level is comparable to that of Si solar cells. On a coupon consisting of 24 (2*4 cm) cells mounted on a carbon fiber composite substrate, high-resistance capability against deep thermal cycling between +80 degrees C and -170 degrees C was demonstrated.