Solar cell

The invention discloses a solar cell. The solar cell comprises a first solar cell unit, a second solar cell unit and an intermediate layer, wherein the first solar cell unit comprises a first p-i-n semi-conductor layer, the second solar cell unit comprises a second p-i-n semi-conductor layer, and the intermediate layer is arranged between the first solar cell unit and the second solar cell unit. The first p-i-n semi-conductor layer and the second p-i-n semi-conductor layer which are in contact with the intermediate layer are of different doping types, the intermediate layer is of a non-doping semi-conductor layer, and the band gap of the intermediate layer is smaller than the band gaps of the first p-i-n semi-conductor layer and the second p-i-n semi-conductor layer which are arranged at the two sides of the intermediate layer and are in contact with the intermediate layer. Tunneling recombination of electrons and a cavity at the position of the intermediate layer can be promoted, therefore, the output power