Patent ID: 9520517
Filing Date: 2016-12-13
CPC Classification: H01L,Y02E

Claim Text:
1. A solar cell, comprising: a single crystalline silicon substrate of a first conductive type; an emitter layer of a second conductive type opposite the first conductive type, the emitter layer forming a hetero junction with the single crystalline silicon substrate and including a first crystalline portion; a back surface field layer of the first conductive type, the back surface field layer forming a hetero junction with the single crystalline silicon substrate and including a second crystalline portion; a first electrode portion on the emitter layer; and a second electrode portion on the back surface field layer, wherein the back surface field layer has a crystallinity greater than a crystallinity of the emitter layer, wherein the emitter layer and the back surface field layer are on a back surface of the single crystalline silicon substrate and are spaced apart from each other, and wherein a first passivation layer is located on the back surface of the single crystalline silicon substrate between the emitter layer and the back surface field layer and is not located between the emitter layer and the back surface of the single crystalline silicon substrate and between the back surface field layer and the back surface of the single crystalline silicon substrate.