Carbon-based perovskite solar cell and preparation method thereof

The invention relates to the technical field of solar cells, in particular to a carbon-based perovskite solar cell and a preparation method thereof. The carbon-based perovskite solar cell comprises a conductive transparent substrate, a compact titanium dioxide layer, a mesoporous titanium dioxide layer, a perovskite light absorption layer and a carbon electrode layer which are stacked in sequence. Wherein the surface layer of the carbon electrode layer is an inner protection layer with oxygen-containing functional groups, and part of the oxygen-containing functional groups are in chemical bond connection with the hydrophobic modifier to form a hydrophobic outer protection layer. The surface layer of the carbon electrode layer is provided with an inner protection layer containing oxygen functional groups, so that when the perovskite battery diffuses and leaks lead ions due to accidents, the lead ions can be adsorbed, and pollution to the environment is prevented; meanwhile, part of oxygen-containing functional