High-efficiency heterojunction solar cell

The utility model provides a high-efficiency heterojunction solar cell. The high-efficiency heterojunction solar cell comprises an N-type silicon wafer, a first intrinsic amorphous silicon layer, an N-type doped layer, a front transparent conductive layer and a front metal grid line layer, the second intrinsic amorphous silicon layer, the P-type doped layer, the back transparent conductive layer and the back metal grid line layer are sequentially arranged on the back of the silicon wafer; the N-type doped layer is of a composite layer structure and comprises an N-type amorphous silicon oxide layer and an N-type amorphous silicon layer; the P-type doped layer is of a composite layer structure and comprises a P-type amorphous silicon oxide layer and a P-type amorphous silicon layer. The N-type doped layer of the composite layer structure improves the optical band gap of the thin film so as to increase the effective absorption of the light incident surface of the cell to light. The P-type doping layer of the com