Ribbon interconnection of 6” BC-BJ solar cells

A 4-cell module with 19.94 % efficiency in a standard module setup with 21.09 % - 21.18 % 6” BC-BJ ZEBRA cells (CTMpower = -3.8 %) is manufactured. For interconnection 8 modified ribbons (1.5 x 0.2 mm²) are used on the rear side. The cells feature a multilayer metallization with a low temperature paste. The module passes TC-200 according to IEC 61215 without degradation. Our cost analysis shows that such a stress relief structure can be realized with additional material costs of lower than 0.2 € for a 60 cell full size module.