Research On Applications Of Inorganic Hole Transport Material In Low Temperature Carbon Based PSC

Low-temperature carbon-based hole-free transport layer perovskite solar cells?PSC?use carbon electrodes instead of expensive gold electrodes that require high equipment and remove expensive organic hole transport layers,which not only simplifies the process but also reduces the cost.Moreover,the hydrophobicity of the carbon electrode itself can well protect the light absorbing layer and improve the cell stability.Therefore,this PSC structure suitable for commercial production has attracted wide attention of researchers.However,unlike the structure of a conventional PSC,such the cel has no hole transport layer,and therefore it is required to improve the carrier transport properties of the light absorbing layer and the carbon electrode.On this basis,the application of inorganic hole transport material?HTM?in low temperature carbon-based hole-free transport layer PSC is studied in this paper,aiming to improve the carrier transport capacity in this structure and improve the cell performance.Furthermore,the NiO/rGO composite was used to improve the conductivity of NiO,and the carbon electrode with higher performance was doped and prepared.The specific research contents and conclusions are as follows:?1?The effects of CuI,CuO and NiO doped MAPbI₃ on the cell performance were investigated.The results show that the three inorganic HTM doped MAPbI₃ can not only effectively reduce the internal carrier recombination of the cell,but also transfer more carriers to the carbon electrode,and the cell performance is correspondingly improved.Comparing the three inorganic HTM doped MAPbI₃,it was found that the NiO doped the cell has the best performance and relatively long stability.In view of the shortcomings of NiO is low conductivity,the NiO/rGO composite was synthesized and doped with MAPbI₃ to improve the cell performance.It was found that the addition of rGO effectively increased the carrier transport inside the celll,but reduced the composite impedance inside the cell and at the interface.Under the combined conditions,the doping of the light absorbing layer of the composite did not achieve higher cell performance than the doping of NiO.?2?The effects of CuI,CuO and NiO doped carbon electrodes on the performance of PSC were investigated.The results show that the three inorganic HTM doped carbon electrodes are effective in improving cell performance.The improvement in cell performance is attributed to the improved transport of carriers from MAPbI₃ to carbon electrodes by inorganic HTM,as well as improved carrier recombination resistance.Finally,based on this,NiO/rGO doped carbon electrode was used to further improve the performance of PSC,and the doping amount of the composite,the content of rGO in the composite and the particle size of NiO were investigated.The results show that the NiO/rGO doped carbon electrode not only further improves the conductivity of NiO but also maintains good hole transport properties.When the carbon slurry is doped with 0.67 g of composite and the GO content of the composite is 30 mg and the NiO particle size is less than 30 nm,the prepared the cell has the best performance.