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 or/and the P-type doped layer is/are of a multi-layer composite layer structure, namely, the N-type doped layer or/and the P-type doped layer comprises a seed layer, a microcrystalline silicon oxide layer and a microcrystalline silicon layer. The N-type doped layer or/and the P-type doped layer of the high-efficiency heterojunction solar cell adopts a multi-layer composite layer structure, a large optical band gap of the N-type doped layer or/and the P-type doped layer brings great improvement of short