Composite light absorption layer solar cell and preparation method thereof

The invention discloses a composite light absorption layer solar cell and a preparation method thereof. The composite light absorption layer solar cell comprises a transparent conductive substrate, atransparent electron transport layer, a composite light absorption layer and a carbon electrode layer which are sequentially arranged from bottom to top, and the composite light absorption layer is composed of a CsPbBr3 perovskite thin film layer and a CsPbBr3 quantum dot thin film layer which are sequentially arranged from bottom to top. The preparation method comprises the step of sequentially preparing the transparent electron transport layer, the CsPbBr3 perovskite thin film layer, the CsPbBr3 quantum dot thin film layer and the carbon electrode layer on the transparent conductive substrate, wherein the CsPbBr3 quantum dot is prepared by taking Cs2C2O4 as a cesium source. According to the composite light absorption layer solar cell, the short-circuit current density, the open-circuit voltage, the filling facto