Fast dipping treatment for dense perovskite thin films

Abstract

Many groups have tried to make a dense organi-inorganic hybrid perovskite layer with one-step process. And perovskite synthesis method with the diethyl ether has been attempted in their own ways, such as dropping, long time dipping and so on. However, the reports for the solar cell having inverted form, photo-voltaic devices using PEDOT:PSS as hole transport layer, are not enough. In this work, we made the dense perovskite layer through fast-dipping method that casted films was soaked into diethyl ether. We study on the morphology and electrical properties of Methyl ammonium lead iodide (MAPbI3) thin films. The solar cells were consisted with ITO/PEDOT:PSS/MAPbI3/PCBM/Ag. The device performance were investigated with solar-simulator. At the same time, morphology, optical properties and crystalline variations were investigated by field emission scanning electron microscopy (FE-SEM), UV-Vis spectroscopy and X-ray diffraction (XRD) analysis, respectively.