Application Of Black Porphyrin-like Dyes In Solar Cells

This paper mainly studies the application of black porphyrin-like dyes in solar cells.The black porphyrin-like dye T2(Zinc-β,β’-trinaphthoquinone-carboxyphenyl porphyrin)based on the structure of black porphyrin T1(Zinc-β,β’-tetranaphthoquinone-porphyrin)was designed and used in dye-sensitized solar cells to study its photoelectric properties.The related properties of black porphyrin T1 as a hole transporting material for perovskite solar cells have been studied,too.The important intermediates sulfone pyrrole,sulfone porphyrin,and black porphyrin T1 was synthesized through esterification,formylation,dehydrogenation,reduction,decarboxylation,condensation,diene addition and other reactions based on p-toluenesulfonic acid,aminoacetic acid,benzyl alcohol,3,4-dibromosulfolane,sodium benzenesulfinate and other basic materials.The triacene zinc porphyrin 11 and4-ethynyl-benzoic acid were then diene added to obtain the target molecule T2.Structures of each intermediate and target molecule were identified by mass spectrometry,nuclear magnetic resonance and other methods.The black porphyrin-like dye T2 molecule was applied to dye-sensitized solar cells and its photophysical,electrochemical,and photovoltaic properties were tested and density functional theory calculations were performed.The results show that T2 molecule has extremely strong light harvest ability,high recombination resistance and electron injection lifetime.But the lower value of LUMO energy level and disorderly distribution seriously affect the electron injection efficiency,resulting in the poor photoelectricity of the device.The PCE of the device is only 0.1 %.However,researchs on the performance of T2 and N719 composite devices have found that the introduction of T2 can effectively improve the devices’ light-harvest ability,composite resistance,and lifetime of injected electrons.Studies on the thermal stability,energy levels,and film-forming properties of the black porphyrin T1 molecule have found that T1 has the potential to be used as a hole transport material.The perovskite solar cells with T1 as a hole transport layer achieved a PCE of 13.43 %,which is better than Spiro-OMe TAD(11.63 %).