Synthesis And Application Of Bis(Diarylamine Fluorene) Hole Transport Materials Based On Different Conjugated Bridges

With the continuous consumption of non-renewable energy such as fossil energy on the earth and the appeal and support of various regional organizations for the vigorous development of environmental protection,how to efficiently use solar energy,an inexhaustible clean and renewable energy source,has become one of the world's Big problem.Perovskite solar cells have attracted a lot of attention due to their rapid development.Among them,hole transport materials have a vital influence on the improvement of device efficiency and performance stability.In this paper,three bis(diarylaminofluorene)hole transport materials with furan or thiophene derivative groups as the intermediate unit structure are designed and synthesized.They are FZH1,FZH2,and FZH3.They are under alkaline conditions.,The corresponding dialdehyde compound and 2,7-dibromofluorene undergo a condensation reaction,and then the reactant and bis(4-methoxyphenyl)amine undergo Buchwald–Hartwig reaction to produce the final product.In order to further determine the molecular structure of organic compounds,we carried out a series of characterizations of related substances such as hydrogen nuclear magnetic resonance spectroscopy and carbon spectroscopy.Density functional theory to optimize the structure of the compound,and then we applied it to the perovskite solar cell,and explored the effect of the bis(diarylamine fluorene)hole transport material we designed and synthesized on the perovskite solar cell under different conditions.The impact of the overall battery performance.The structure of organic small molecule compounds has a very important influence on all aspects of its performance.The intermediate structural unit is connected with the fluorene structure by a double bond to form a conjugate bridge,which increases the conjugate system of the material and makes it absorb and absorb light.The capture ability is enhanced.The optical and electrochemical properties of the three molecules FZH1,FZH2 and FZH3 are very similar.They all have a?-?*transition at a wavelength of about 380nm,and have a maximum absorption peak at 475nm.At the same time,the HOMO-LUMO energy levels of these three new hole transport materials all play a role in blocking electrons and transporting holes.When FZH1 is used as a hole-transporting material on perovskite solar cells,test studies have shown that compared with the absence of dopants,devices with Li TFSI and t-BP as dopants are added.Performance parameters show very excellent performance;under the same conditions,the device based on FZH1 has almost the same performance as spiro-OMe TAD,and even higher open circuit voltage.After optimization and comparison,the most excellent device based on FZH1 under simulated sunlight(AM1.5,100 m W/cm~2)has an open circuit voltage of 1.00 V,a short circuit current density of 17.54 m A/cm~2,and a fill factor of 66.93%,the power conversion efficiency can reach 13.01%.