▎ 摘　　要

NOVELTY - Preparing interface barrier material, comprises dissolving monomer A (I)-(III), monomer B (IV) and initiator in solvent and polymerizing at 95-105degrees Celsius USE - The interface barrier material is useful in multilayer perovskite solar cell (claimed). ADVANTAGE - The interface barrier material inhibits ion migration between perovskite layers and enables the fabrication of highly efficient and stable devices. DETAILED DESCRIPTION - Preparing interface barrier material, comprises dissolving monomer A of formulae (I)-(III), monomer B of formula (IV) and initiator in solvent and polymerizing at 95-105degrees Celsius. R1, R2, R3, R4 = olefin; R = olefin derivative; and R5 = multi-branched olefin. INDEPENDENT CLAIMS are also included for: (1) interface barrier material, prepared by above method; and (2) multilayer perovskite solar cell, comprising a first transport layer located on upper end surface of a substrate, multiple perovskite layers located above the first transport layer, the bottommost perovskite layer is located on the upper end face of the first transport layer, an interface barrier layer is provided between any two adjacent perovskite layers, the upper and lower end faces of the interface barrier layer are respectively attached to the end faces of the perovskite layer, a second transport layer is located on the upper end surface of the perovskite layer, and a counter electrode layer is located on the upper end surface of the second transport layer. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of multilayer perovskite solar cell structure. Perovskite layer surface (1) First transport layer (2) Uppermost perovskite layer (3) Interface barrier layer (4) Second transport layer (5) Electrode layer (6)