Patent ID: 9698294
Date: 2017-07-04
CPC Classifications: H01L,Y02E

Claim:
1. A bifacial solar cell comprising: a substrate; an emitter portion disposed on a first surface of the substrate; a plurality of first electrodes directly contacted with the emitter portion and extended in a first direction; a plurality of first current collectors extended in a second direction crossing the first direction, wherein the plurality of first current collectors are electrically and physically connected to the plurality of first electrodes; a back surface field disposed on a second surface of the substrate, and having an impurity concentration that is higher than an impurity concentration of the substrate; a plurality of second electrodes directly contacted with the back surface field and extended in the first direction; and a plurality of second current collectors extended in the second direction, the plurality of second current collectors being electrically and physically connected to the plurality of second electrodes, wherein a number of the plurality of second electrodes is more than a number of the plurality of first electrodes, wherein each of the plurality of second electrodes is positioned on a different reference line from a reference line of each of the plurality of first electrodes, and the first electrodes and the second electrodes are not overlapped with each other and a portion where the first electrodes and the second electrodes are overlapped does not exist, wherein two neighboring first electrodes of the plurality of first electrodes are spaced apart from each other by a first pitch P wherein a ratio n of the first pitch P