Patent ID: 8779281

Claim:
A solar cell, comprising: a semi-conductive substrate having a front surface and a back surface; a doping layer disposed on the front surface of the semi-conductive substrate; an anti-reflection layer disposed on the doping layer; an electrode disposed on the anti-reflection layer and electrically connected to the doping layer; a passivation stacked layer disposed on the back surface of the semi-conductive substrate, the passivation stacked layer comprising: a first dielectric layer; a second dielectric layer; and a middle dielectric layer sandwiched between the first dielectric layer and the second dielectric layer, wherein a dielectric constant of the middle dielectric layer is lower than a dielectric constant of the first dielectric layer and a dielectric constant of the second dielectric layer, wherein a thickness of the middle dielectric layer is larger than a thickness of the first dielectric layer and a thickness of the second dielectric layer; and a contact layer covering the passivation stacked layer and electrically contacting with the back surface of the semi-conductive substrate.