Preparation Of Organic Metal Halide Perovskite And Photoelectric Properties Research

Solar cells can be assembled with low-cost materials,manufactured with cost-effective and environmental protection methods,and are admittedly considered very promising renewable energy technologies.Alkylammonium lead(II)halides CH3NH3PbI3,which are utilized to assemble the perovskite solar cell,have been shown to be efficient photovoltaic materials with excellent light harvesting,high carrier mobility,and facile solution processability.The research on perovskite solar cells has grown enormously,and the PCEs are improved to 20%.In this paper,the compact TiO2 layer,mesoporous TiO2 layer and perovskites film were prepared by spin coating methods,and anti-solvents benzene and chlorobenzene were used to control the morphology of perovskites film.The samples were characterized by structured observation and photoelectric techniques.The details and results are summarized as follows:The compact TiO2 layer was uniform-sized and dense anatase structure,which acted as blocking layer;the mesoporous TiO2 layer with porous structure and uniform distribution was formed about 30 nm grain size.The film samples of CH3NH3PbI3 without anti-solvents revealed a lower crystallinity,light absorbance and poorer density.The incident photon-toelectron conversion efficiency(IPCE)of the device rose to about 35% and the photoelectric conversion efficiency(PCE)was ?=1.02%.Anti-solvents benzene and chlorobenzene were employed to control the synthesis of the uniform morphology perovskite membraneS,and the influences of different anti-solvents addition were also studied.The morphology and the structure of the films were characterized by SEM,XRD,EDS.The photoelectric conversion efficiency tests revealed that the IPCE of the device with anti-solvents rasied to 60%.Photoelectric conversion efficiency of the device with benzene increased from the initial 1.02% to 3.73%,and chlorobenzene to 3.58%.