Solar cell

The utility model provides a solar cell, includes that a semiconductor base material, a passivation layer pile up, a plurality of opening and a plurality of back electrode. The semiconductor base material has a positive surface and a back of the body surface, and the passivation layer piles up formed at the back of the body surface of semiconductor base material, and a plurality of openings run through and among the passivation layer piles up, and a plurality of back electrode is in the opening. Wherein, the length of back electrode is greater than the distance of adjacent back electrode. Consequently, promote solar cell's whole efficiency effectively. 种太阳能电池，包含有半导体基材、钝化层堆叠、多个开口以及多个背面电极。半导体基材具有正表面与背表面，钝化层堆叠形成于半导体基材的背表面，多个开口贯穿并形成于钝化层堆叠之中，而多个背面电极形成于开口中。其中，背面电极的长度大于相邻的背面电极的距离。因此，有效地提升太阳能电池的整体效率。