Patent ID: 8952244
Filing Date: 2015-02-10
Classification: H01L,Y02E

Abstract:
1. A solar cell, comprising: a semiconductor substrate having a front surface and a back surface, wherein the front surface of the semiconductor substrate has a plurality of nano-rods extending from the front surface, a height of the nano-rods is 0.005 to 20 μm, a width of the nano-rods is 0.005 to 5 μm, and a distance between the adjacent nano-rods is 0.005 to 5 μm; a doping layer, disposed on a surface of the nano-rods; a front anti-reflective layer covering the doping layer, wherein a material of the front anti-reflective layer is indium tin oxide; a quantum well layer disposed on the back surface of the semiconductor substrate, the quantum well layer having at least one first doping region and at least one second doping region, wherein the first doping region and the second doping region have opposite conductivity types, the quantum well layer comprises a first polycrystalline silicon germanium (Si a first passivation layer, covering the first doping region of the quantum well layer, wherein the first passivation layer comprises a N-type doping passivation material and a first passivation material, and wherein the N-type doping passivation material is sandwiched between the first passivation material and the first doping region; a second passivation layer, covering the second doping region of the quantum well layer and the N-type doping passivation material, wherein the second passivation layer comprises a P-type doping passivation material and a second passivation material, the P-type doping passivation material is sandwiched between the second passivation material and the second doping region; and at least one first metal electrode and at least one second metal electrode contacting and passing through the P-type doping passivation material to be electrically connected to the first doping region and the second doping region of the quantum well layer, respectively.