Heterojunction solar cell

The utility model discloses a heterojunction solar cell, and belongs to the field of solar cells. The utility model provides a heterojunction solar cell, and aims to solve the problems of high cost and poor conductivity in the long-term storage or heating process of the conventional heterojunction solar cell in the prior art. The heterojunction solar cell comprises an n-type substrate, a first passivation layer located on one side of the n-type substrate, an n-type doping layer, an n-face transparent conductive layer and a first electrode. The second passivation layer, the p-type doping layer, the p-surface transparent conductive layer and the second electrode are located on the other side of the n-type substrate; the thin film transistor is characterized in that the n-surface transparent conductive layer and/or the p-surface transparent conductive layer comprise/comprises at least one buffer transparent conductive layer, and the buffer transparent conductive layer is a tantalum-doped tin oxide layer, a molyb