Black phosphorus film as well as preparation method and application thereof

The invention discloses a black phosphorus film and a preparation method and application thereof, and belongs to the technical field of semiconductor growth and preparation. The preparation method of the black phosphorus film comprises the following steps: (1) preparing a black phosphorus/acetone mixed solution, and carrying out ultrasonic crushing under an ice bath condition to obtain a black phosphorus nanosheet/acetone dispersion solution; (2) centrifuging to obtain black phosphorus nanosheet/acetone dispersion liquid; and (3) inserting a conductive substrate serving as a positive electrode and a conductive metal plate serving as a negative electrode into the black phosphorus nanosheet/acetone dispersion liquid obtained in the step (2), applying direct-current deposition voltage, and depositing on the conductive substrate to obtain the black phosphorus film. The simple preparation technology of the black phosphorus film provides technical support for the application of the black phosphorus film in the fiel