2D/3D heterostructured CsPbI2Br solar cells: a choice for a monolithic all-perovskite tandem device

Improving the performance of CsPbI 2 Br PSCs by spinning BABr on 3D CsPbI 2 Br films to form 2D/3D heterostructures, and based on this, monolithic all-PTSCs are fabricated, realizing a pioneering exploration for the application of CsPbI 2 Br to all-PTSCs.