Study On The Synthesis And Photovoltaic Properties Of Hole Transport Materials Based On Novel Aniline

In recent years,organic perovskite solar cells have developed rapidly,and their photoelectric efficiency has reached 25.2%,becoming a favorable competitor for the commercial development of solar cells.Among the reported hole transport materials,2,2’,7,7’-tetrayl（N,N’-bis（p-methoxyphenyl）amino）-9,9’spirobifluorene（spirobifluoren-e,spiro-OMe TAD）is one of the most widely used materials.However,spiro-OMe TAD is difficult to be mass-produced due to its disadvantages such as complex synthetic route,high purification difficulty,high cost,and the need for doping additives.In summary,we developed several hole transport materials with high efficiency,low cost and good stability.The main research contents and innovations of this article are as follows.Two hole transport materials（NPTPA1 and NPTPA2）,based on N-annulated perylene as a core and bis（4-（methoxy）phenyl）amine,4-bromo-N,N’-bis（4-（methyl Oxygen）phenyl）aniline as end groups were designed and synthesized.The thermal decomposition temperatures are 421°C and 373°C for NPTPA1 and NPTPA2,respectively.The maximum absorption peaks of the fluorescence spectrum are at 584nm and 521 nm,respectively.And the optical band gap(E_g^opt)are 2.28 e V and 2.53 e V,respectively.NPTPA1 and NPTPA2 as the hole transport layer were used,and fabricated a planar heterojunction device using the device structure of ITO/Sn O₂/Perovskite/HTM/Ag.The PSCs based on NPTPA1 achieved the highest PCE of 9.45%with a Voc of 0.94 V,a Jsc of 18.57 m A/cm²,a FF of 53.89%.The PSCs based on NPTPA2 achieved the highest PCE of 17.24%with a Voc of 1.13 V,a Jsc of 21.18m A/cm²,an FF of 71.81%.WMPA combined N¹,N⁴-bis（4-bromophenyl）-N¹,N⁴-bis（4-butylphenyl）benzene-1,4-diamine and 1-ethynyl-4-methoxybenzene by Sonogashira coupling was designed and synthesized.The thermal decomposition temperature of WMPA is 419℃,the optical band gap is 2.88 e V,and the HOMO energy level is-5.05 e V.WMPA as the hole transport layer was used,and fabricated a planar heterojunction device using the device structure of glass/FTO/HTL/Perovskite/C60/BCP/Cu.The highest efficiency of PSC is 19.33%with a Voc of 1.1 V,a Jsc of 21.71 m A/cm²,an FF of 80.96%.Two polymers（FBTF and FBT）were synthesized by Still coupling with 2,7-dibromo-9,9-dioctyl-9H-fluorene,（3,3’-difluoro-[2,2’-bithiophene]-5,5’-diyl）bis（tri-methylstannane）and5,5’-bis（trimethylstannyl）-2,2’-bithiophene.The thermal decompo-sition temperatures of FBTF and FBT are 421℃and 447℃.The absorption sidebands are 527 nm and 520 nm,and the photochemical band gaps are 2.35e V and 2.38 e V,and the electrochemistry band gaps are 2.97 e V and 2.93 e V,respectively.FBTF and FBT as the hole transport layer were used,and fabricat-ed a planar heterojunction device using the device structure of FTO/Sn O₂/HT M/Perovskite/Au.The PSCs based on FBTF achieved the highest PCE of 18.95%with a Voc of 1.01 V,a Jsc of 24.5 m A/cm²,a FF of 77.2%.The PSCs b ased on FBT achieved the highest PCE of 17.74%with a Voc of 0.97 V,a Js c of 22.6 m A/cm²,an FF of 79.9%.