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CsPbBr3 perovskite films were prepared by using two-step method and using as an active material in the hole-free transport materials for perovskite solar cells. The CsPbBr3 perovskite films were coated on the F-SnO2 (FTO) conductive substrate by the spin coating technique. To prepare CsPbBr3 perovskite film by the two-step method, firstly, the PbBr2 film was coated on the FTO substrate by spin coating technique and then PbBr2 film was immersed in CsBr solution at 50 °C for 20 min. Finally, the CsPbBr3 film was annealed at 300 °C in air for 10 min. The surface morphology and the film thickness of CsPbBr3 perovskite films were characterized by the scanning electron microscope (SEM). The crystalline structure and light absorption properties of the CsPbBr3 film were investigated by the x-ray diffraction (XRD) and UV-visible spectroscopy. The XRD result shows that the CsPbBr3 crystals are pure perovskite phase. The energy bandgap (Eg) of CsPbBr3 film investigated by the UV-visible technique is found about 2.3 eV. The CsPbBr3 perovskite solar cell sample shows the solar cell efficiency of 1.4%.
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Key Words : perovskite solar cells, CsPbBr3, hole-free transport materials
