Abstract: The present disclosure relates to a heterojunction solar cell, including a substrate layer, a first passivation layer, a second passivation layer, an emission member, and a back surface field member. The emission member and the back field member each include a doped layer, a conducting layer, and an electrode layer sequentially disposed along the direction away from the substrate layer. One or both of the emission member and the back surface field member include an electrical contact reinforced structure. The electrical contact reinforced structure is a first doped region and a second doped region of the doped layer. The second doped region is disposed beside the first doped region and is shielded by the electrode layer. One or both of the doping concentration and the crystallization degree of the second doped regions are higher than those of the first doped region.

Abstract: A preparation method of a heterojunction solar cell includes following steps: depositing a first passivation layer on a first surface of a silicon substrate by using a gas source, a base material of the first passivation layer being hydrogenated amorphous silicon; during depositing hydrogenated amorphous silicon of the first passivation layer, allowing the gas source to gradually incorporate carbon dioxide, and controlling a proportion of carbon dioxide in the gas source to gradually increase with increase of a thickness of the first passivation layer which has been deposited.

Abstract: A preparation method of a heterojunction solar cell includes following steps: depositing a first passivation layer on a first surface of a silicon substrate by using a gas source, a base material of the first passivation layer being hydrogenated amorphous silicon; during depositing hydrogenated amorphous silicon of the first passivation layer, allowing the gas source to gradually incorporate carbon dioxide, and controlling a proportion of carbon dioxide in the gas source to gradually increase with increase of a thickness of the first passivation layer which has been deposited.

Abstract: A solar cell is provided, includes: a substrate, a first passivation layer, an emission layer, a first conductive layer, a second passivation layer, a back surface field layer and a second conductive layer. The first passivation layer, the emission layer and the first conductive layer are sequentially disposed on a surface of one side of the substrate, and the second passivation layer, the back surface field layer and the second conductive layer are sequentially disposed on a surface of another side of the substrate. The first conductive layer includes a first transparent conductive oxide layer, a first conductive metal layer and a second transparent conductive oxide layer which are sequentially stacked.