The Study Of Perovskite Solar Cells With Carbon Counter Electrodes Based On One-dimensional TiO₂

The perovskite solar cells and the battery efficiency began to leaps and bounds since new light-sensitive organometallic halide perovskite materials had applied to solar cells in 2009.So far,photosensitive materials of perovskite solar cells efficiency has been More than 20%.Meanwhile,perovskite solar cells has become a research hotspot for researchers.The traditional structure of perovskite solar cells contain the hole transport layer and the precious metal electrode,while the price of these two materials are too expensive.In order to reduce the production cost and operating process,a technology based on screen printing of the perovskite solar cells has begun to apply.The characteristics of the battery are titanium dioxide transport layer,zirconia spacer layer and carbon to the electrode are deposited on FTO glasses by screen printing technology,and then fill the perovskite light absorption layer.However,the different morphology of titanium dioxide structure of the battery also have different effects,titanium dioxide nanorods are applied in the perovskite solar cells because of its one-dimensional electron transport channel can effectively reduce the combination of electrons and holes.In this paper,TiO₂ nanorods with different reaction temperature and reaction time were prepared by hydrothermal method.Then,the ZrO₂ as the interlayer and the carbon as the electrode are assembled the perovskite solar cells by using the screen printing technology.The main works are as follows:?1?The TiO₂ nanorods were grown on the conductive glass substrate by hydrothermal method.The effects of different hydrothermal reaction time and temperature on the morphology and thickness of TiO₂ were investigated.The films were characterized by scanning electron microscopy?SEM?and X-ray diffraction?XRD?.And then they were assembled into a perovskite solar cell with a hole-free transport layer and carbon to the electrode.The results show that when the reaction time is 60 min and the reaction temperature is 180?,TiO₂ nanorods are sparse and uniform,and the thickness of them is about 300 nm.At the same time,the best photoelectric conversion efficiency of perovskite solar cell could reach 7.60%.?2?TiO₂/BaTiO₃ nanocomposites were prepared by spin coating a layer of BaTiO₃ particles on the TiO₂ nanorods by spin coating method.TiO₂/BaTiO₃ nanocomposites were assembled with a hole-free transport layer,zirconia as spacer layer and carbon as the electrode.TiO₂/BaTiO₃ nanocomposites were characterized by SEM,EDS,UV visible absorption spectroscopy?UV-VIS?,EIS and other means.The results show that TiO₂/BaTiO₃ nanocomposites can increase the absorbance of perovskite and affect the crystal morphology of perovskite whitch make the perovskite filling more uniform.So that the best photoelectric conversion efficiency of them could reach 8.58%,which improved 12.9%comparing with TiO₂ nanorods.