Study On The Properties Of Printable Mesoscopic Perovskite Solar Cells Modified With Small Molecule Triphenylamine Derivatives Containing Double Anchored Groups

Due to the absence of a hole transport layer in the printable mesoscopic perovskite solar cell,the overall thickness of the device will be much thicker than that of perovskite solar cell with planar structure.It leads to loss of carriers during the transport process and serious recombination at the carbon electrode interface.Therefore,a strategy of modifying the printable mesoscopic perovskite solar cell with small molecule triphenylamine derivatives containing double anchored groups was proposed.The works carried out in this dissertation are as follows:1)Through classical reaction such as Ullmann coupling,Vilsmeier Haack reaction,Wittig reaction,and Knoevenagel reaction,two D-π-A type triphenylamine derivatives with cyanoacetic acid or rhodanine acetic acid as electron acceptors were designed and synthesized.The two molecules are 4-[N,N-di(4-methoxyphenyl)amino]phenyl-1-cyanobutadiene and 4-N,N-di(4-methoxyphenyl)amino]phenyl-1-rhodanine acetate butadiene),which are shorted as H372 and H373,respectively.Their structures were identified by ~1HNMR and IR.2)The photoelectric performances of H372 and H373 were tested,the absorption ranges of H372 and H373 were measured by UV visible absorption spectroscopy,and the energy levels of H372 and H373 were determined by cyclic voltammetry.3)H372 and H373 molecules were applied to printable mesoscopic perovskite solar cells.The effects of different addition methods including pre-treatment,post-treatment,and co-crystallization were investigated firstly.The results showed that the devices made by adding H372 and H373 to perovskite precursor solution with co-crystallization method have higher power conversion efficiency,and the efficiency of H373 modified cell device was better than that of H372 modified one.Secondly,the effects of H372 and H373 with different addition concentrations for co-crystallization on printable mesoscopic perovskite solar cells efficiency were studied.It showed that the solar cell efficiency was higher when0.05 M H372 or H373 was added,and the latter device as superior than the former one.The power conversion efficiency of the 0.05 M H373 modified solar cell reached 16.31%,and the efficiency was improved by 21%,compared to the control device with efficiency of 13.49%.The experimental results showed that these type molecules like H372 and H373 can be applied on printable mesoscopic perovskite solar cell to improve the cell performance.