Patent ID: 9608133
Date: 2017-03-28
CPC Classifications: H01L,Y02E,Y02P

Claim:
1. A bifacial solar cell comprising: a substrate of an n-type; an emitter layer positioned on a front surface of the substrate, the emitter layer being a p-type and formed on an entire surface of the front surface; a plurality of first electrodes partially positioned on the emitter layer and electrically connected to the emitter layer, the plurality of first electrodes extending parallel to one another in a first direction; a first protective layer positioned on a front surface of the emitter layer; a first anti-reflection layer positioned on a front surface of the first protective layer; a plurality of back surface field layers partially positioned on a back surface of the substrate; a plurality of second electrodes partially positioned on the plurality of back surface field layers and electrically connected to the plurality of back surface field layers, the plurality of second electrodes extending parallel to one another in the first direction; and a second protective layer positioned on the back surface of the substrate, wherein the first protective layer and the second protective layer are formed of a material having negative fixed charges of the same conductive type as the n-type configured to generate a field effect passivation characteristic, and the first anti-reflection layer is formed of a material having positive fixed charges of the same conductive type as the p-type, wherein the plurality of back surface field layers and the plurality of second electrodes are partially positioned on the back surface of the substrate, wherein each of the plurality of back surface field layers directly contacts one of the plurality of second electrodes, and light is incident on the front surface and back surface of the substrate, wherein a distance is formed between adjacent ones of the plurality of back surface field layers and between adjacent ones of the plurality of second electrodes, wherein the first protective layer contains yttrium oxide (Y wherein the first anti-reflection layer contains silicon nitride (SiN wherein a silicon oxide layer having a thickness of about 1 nm to 3 nm is formed at an interface between the first protective layer and the emitter layer.