Photoelectric device and preparation method and application thereof

The invention relates to a photoelectric device and a preparation method and application thereof. The photoelectric device comprises a substrate layer, a hole transport layer and a perovskite layer, wherein the hole transport layer and the perovskite layer are arranged on the substrate layer; the hole transport layer is closer to the substrate layer than the perovskite layer; wherein the material of the hole transport layer comprises a self-assembly monomolecular material with the following structural general formula: # imgabs0 #; in the formula, R1 and R2 are respectively and independently selected from one of hydrogen and C1-C10 alkyl; l is selected from one or more of C2-C18 alkylene groups and phenylene groups; a is an anchoring group; and n is an integer from 2 to 100000. The self-assembled monomolecular material can be applied to a hole transport layer, the stability and wettability between the hole transport layer and a perovskite layer are improved, and the photoelectric conversion efficiency of a dev