The Fabrication Of Doped Hole Transport Layer By Electrochemical Deposition And Their Photoelectric Conversion Performance

Perovskite solar cell is a promising photovoltaic device with the certified champion effiency of 25.2%,thanks to the advantages of clean energy,low cost and high photoelectric conversion.Development of perovskite solar cells is a beneficial strategy for alleviating the future energy crisis and environmental pollution.Under the influence of temperature,light,pressure and other external fabrication factors,photoelectric conversion performance would be affected by the tunable perovskite band gap and carrier transport layer quality.In this dissertation,we focus on two aspects:the optimal design of the hole transport layer and the photoelectric conversion performance with controllable fabrication temperature.Firstly,homogeneous lithium doped nickel oxide hole transport layer was prepared by electrochemical deposition.When the lithium doping in the nickel oxide amount is 32%,a uniform and crystalline hole transport layer is obtained,and the generated perovskite grain size was relatively large,uniform and good crystallinity by scanning electron microscopy?SEM?and X-ray diffraction?XRD?.Through the analysis of space charge limited current?SCLC?measurement,the Li_0.32Ni O_xperovskite solar cell is obtained the maximum photovoltaic conversion efficiency of20.44%,attributing to lowest defect density and inhibiting the composition of charge carriers.Secondly,the perovskite film was treated by controllable temperature fabrication.the drikold-cooled perovskite film displays good crystallinity by the X-ray diffraction?XRD?patterns.The scanning electron micrograph?SEM?and the cross-sectional scanning electron micrograph?SEM?showed that the drikold-cooled perovskite film had larger grain size and single vertical particle,which improve the interfacial carrier transfer.The optimal photoelectric conversion efficiency?PCE?of the drikold-cooled perovskite solar cell is 16.60%.