Synthesis And Photovoltaic Properties Of Organic Sensitizing Dyes Containing Indenazopyrrolothiophene

The current global energy crisis has caught the attention of scientists from all over the world.Solar energy,as one of the few stable and non-exhausted energy in nature,is an ideal substitute for future fossil energy.At present,solar energy utilization has made some progress,dyesensitized solar cells are one of the most likely to achieve industrialization.Organic dyes(DSSCs)are the most important part of the solar cells.Organic dyes are the most important part of the DSSCs.In dye-sensitized solar cells,?-conjugated bridges play an important role in the regulation and optimization of the optical and electrochemical properties of dyes.Among them,a rigid planar aromatic compound as a dye of a conjugated bridge has allowed DSSCs to achieve a maximum photoelectric conversion efficiency of 12.5% without co-adsorbate or an auxiliary sensitizer.Therefore,these compounds have important research value.The main work of this work is to design and synthesize a ?-conjugated bridge with a rigid plane for the construction of organic photosensitive dyes.Through the rigidification of aromatics,organic molecules can be planarized and contribute to the conduction of intramolecular charge information.In this study,an oligo-aromatic group,the 4,5-dihexyl-4,5-dihydrothieno[2'',3'':4',5']pyrrolo[2',3':4,5]thieno[3,2-b]indole(DPTI)is first synthesized.We optimized the Cadogen reaction to improve the yield of this kind of reaction and provide a new synthesis strategy for the synthesis of indenazo-pyrrolothiophene.Through the molecular design,we have built a series of DPTI organic dyes(M81,M83,M84 and M85)to systematically investigate the effect of DPTI as a conjugate bridge on dye light trapping ability,electrochemical energy level and photovoltaic performance.At the same time,through the adjustment of the donor group and the conjugate bridge,further improve the photovoltaic properties of such organic dyes.Photoelectrochemical properties,photovoltaic tests and kinetic tests show that: 1)DPTI conjugate bridges are better than benzeneazolylthiophene conjugate bridges.M81 has better light trapping ability than M82,meanwhile,it suppresses the recombination of electrons in the battery.2)The power supply capability of the power supply unit can not further improve the photoelectric conversion ability of the dye M83.3)In the power supply unit and the DPTI conjugate bridge The introduction of hexylthiophene can not only broaden the absorption spectrum of dye M84,but also distort the molecular structure and effectively control the electron recombination in the battery.The DSSC based on photosensitizer M84 achieved a 7.59% photoelectric conversion rate under a simulated simulated solar light source.These systematic studies provide an experimental basis for understanding the relationship between large rigid conjugate bridges and the light trapping ability,molecular energy level,electronic recombination and photovoltaic performance of dye molecules,and provide theoretical guidance for further molecular design.