Lead-free hybrid two-dimensional double perovskite material and preparation method thereof

The invention provides a two-dimensional double perovskite material. The composition formula of the two-dimensional double perovskite material is AnMIIIMIX8, wherein A is organic amine; MIII is a trivalent metal element; MI is a monovalent metal element; and X is halogen. The two-dimensional double perovskite material has certain advantages of methylamine lead-iodine perovskite and lead-free double perovskite. The material is lead-free and environmentally friendly, has very good light stability and good chemical stability, and is unlikely to deteriorate in air. The material has a suitable andadjustable light absorption band gap, and more importantly can be used for preparing a film at a low temperature by a solution method. The advantages provide basis for the application of the materialin the photovoltaic fields such as solar cells, optical detectors and light-emitting diodes. 本发明提供的该二维双钙钛矿材料的组成式为AMMX；其中，A为有机胺，M为三价金属元素，M为价金属元素，X为卤素；这类材料具有甲胺铅碘钙钛矿及无铅双钙钛矿的些优点。该类材料不含铅对环境友好，具有很好的光稳定性和良好的化学稳定性，在空气中保存很难变质。并且该类材料具有合