Preperation of perovskite materials and perovskite solar cells by vapor-assisted solution process

Hybrid perovskites (e. g., CH₃NH₃PbX₃, X represents a halide) are attracting more and more attention from both industry and academic due to their widely applications in the field of photoelectric device, especially as light absorption material in solar cells. The process of industrialization of perovskite solar cells is in progress, and in the pursuit of low-cost and efficient perovskite PV technology, it is crucial to develop a facile and high reproducible technique for preparing perovskite films. Unlike other conventional solution treatments, the vapor-assisted solution process(VASP) treatment avoids the dissolution and solvation of the film during growth, inhibits the formation of crystal nucleus and allows rapid recombination of the film to obtain dense high-quality perovskite film. At present, the conversion efficiency of planar structure perovskite solar cells based on this film is reaching up to 16.8%. In this paper, the research progress of perovskite thin films and photovoltaic devices prepared by low temperature(<150℃) VASP method is reviewed. This paper also prospects the industrialization of the technology. VASP has the advantages of simple preparation process, excellent performance and high reproducibility, which provides the possibility of further preparation of large-area and high-quality film.