The Preparation And Physical Properties Of Dithiolene Nickel Near-IR Dyes Substituted By Naphthyl

With the development of the times,the progress of society,people are grossly overexploited and used for resources,which has led to the depletion of resources,and environmental problems have followed.Therefore,a new,environmentally friendly clean energy solution is needed to solve the current problem,for example,the utilization of solar energy cell.And the dye-sensitized solar cell(DSSC)is considered as a promising means.The DSSC together with organic solar cells and Perovskite solar cells are incorporated into the third generation solar cell category,they can use solar energy directly and efficiently through photovoltaic conversion,Because development of the DSSC conforms to the concept of environmental friendliness,and its production process is simple,its quality is light,the work life is longer,the energy consumption is low and so on,which is widely concerned by researchers.And dye sensitizers as the core part of DSSC naturally become a main study object of this field.Since dye sensitizers have become a breakthrough in improving the efficiency of photovoltaic conversion in these solar cells,researchers have been constantly attempting to preparation of a variety of active materials.It is found that a class of organic dye of bis(dithiolene)metal complexes have strong spectral absorption in the near-infrared region,and their good photothermal stability and special spatial structure have been widely studied by researchers,and new near-infrared dyes with better performance can be obtained through chemical modification.In the paper,a series of modified bis(dithiolene)metal complexes were synthesized through replacing the benzene ring with naphthyl,the structure makes the conjugate system of bis(dithiolene)metal complexes become better,and optimize photoelectric performance.Further modification of the naphthalene,electron donating substituents were introduced,which leads to the good solubility and red-shifted absorption of the maximum absorption,Finally,three complexes were prepared and their photoelectric properties were systematically investigated.The results of the ultraviolet spectroscopy showed that the maximum absorption wavelength of these complexes is about 890 nm,and with different used solvent polarity,the maximum absorption wavelength of these complexes moves red-shifted with the increase of solvent polarity.The stability of these complexes in the solution is greatly affected by temperature.By infrared spectroscopy(IR)and thermogravimetry(TG)analysis,it is proved that the solid photothermal stability of these complexes is good,whether light or high temperature heating,decomposition is very slow,and with the increase of alkyl chain on the naphthene ring,the thermal decomposition temperature will increase.On the basis of investigation about Cyclic voltammetry(CV),the study found that when these complexes replaced electron donating substituents are more susceptible to oxidation,and as the increase of alkyl chain length,they are more likely to be oxidized.And the energy difference between the HOMO and LUMO is smaller,and its molecules are more easily excited.This is used in the field of dye-sensitized solar cells to improve photoelectric conversion efficiency...