Abstract
We report on metal-organic halide perovskite CH3NH3PbI3 films converted from PbI2 precursors for planar heterojunction perovskite solar cells. PbI2 films as a precursor were deposited by hot-wall method and conventional vacuum evaporation. The conversion to perovskite phase from the PbI2 films were performed by annealing in methyl ammonium iodine (MAI) vapour at 120-150 °C. We confirmed that no residual PbI2 phase can be detected in the converted perovskite films by x-ray diffraction measurements. The surface morphology of the perovskite films was measured by AFM. Roughness Ra of the films is 17.8 nm, which is comparable value to the reported ones. Using the converted perovskite films we fabricated tentative perovskite solar cells with a device architecture of ITO/PEDOT:PSS/Perovskite/C60/Ag. The power conversion efficiencies of the fabricated solar cells from a conventional evaporation and the hot-wall method exhibited 2.22 and 2.33%, respectively.
Highlights
Metal-organic hybrid perovskite solar cells have been extensively studied by many researchers all over the world and its power conversion efficiency (PCE) reaches over 20%, recently [1,2,3]
The perovskite film converted from PbI2 deposited by a vacuum evaporation exhibits uniform surface, the roughness is still high for planar heterojunction solar cells
The PbI2 films were prepared with two kinds of deposition method: a conventional evaporation and the hot wall method
Summary
Metal-organic hybrid perovskite solar cells have been extensively studied by many researchers all over the world and its power conversion efficiency (PCE) reaches over 20%, recently [1,2,3]. The PbI2 films as precursor are deposited by a spin-coating or a conventional vacuum evaporation. These perovskite films have been deposited on porous TiO2 scaffolds. In planar heterojunction perovskite solar cells, the qualities of perovskite film itself such as surface morphology (roughness and pin-hole free) and crystallinity is key factors to fabricate high-efficiency perovskite solar cells. We have studied conversions of CH3NH3Pb3 perovskite films from PbI2 films deposited by the hot-wall method as well as a conventional evaporation method. We have tentatively fabricated perovskite solar cells using the converted perovskite films from PbI2 deposited by the hot-wall method. The fabricated perovskite solar cells were measured current-density voltage characteristics under an AM1.5G light irradiation using a solar simulator
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