Design,Synthesis And Performance Study Of Photovoltaic Function Materials Based On Triphenylamine And 2,1,3-benzothiadiazole

This dissertation consists of two parts:firstly,three novel triphenylamine sensitizers TTR1-3 have been designed and synthesized,and used to manufacture dye-sensitized solar cells.Except co-sensitized with CDCA(Chenodeoxycholic acid),we provide a new approach for enhancing the photovoltaic performances of DSSCs based on single dye.Secondly,two coordination polymers have been obtained based on d10 metal ions and fluorescent ligand.Compounds 1 and 2 are chosen as sensing probes to investigate the fluorescence response of PA and metal ions.Three D-D-π-A dyes(TTR1-3)which based on modification of triphenylamine,with triphenylamine moiety and its derivatives as electron donor,thiophene ring asπ-bridge,and 2-(1,1-dicyanomethylene)rhodanine(DCRD)as electron acceptor,were synthesized and fully characterized.Nanocrystalline TiO2-based DSSCs were fabricated using these dyes to investigate the effect of different donor groups introduced into triphenylamine on their photovoltaic performances.The overall power conversion efficiency(PCE)of DSSCs based on TTR1-3 with chenodeoxycholic acid(CDCA)coadsorbant are 5.20%,5.71%and 6.30%,respectively,compared to 6.62%achieved with N719.Introduced heterocyclic group with alkyl lain into triphenylamine decreased dye absorbed amount but significantly improved the value of the open circuit voltage(Voc)and the short-circuit photocurrent(Jsc),which result from the fact that they can effectively suppress the charge recombination and prevent aggregation between adjacent molecules on TiO2.We also researched the effect of sensitization way for single dye on their photovoltaic performances.The PCE of DSSCs soaked for 32 h increase slightly than that of DSSCs soaked for 16h,which result from the adsorption quantity on TiO2 surface.We found that,with soaking twice in 32 h,the Jsc and Voc were both obviously improved compared with soaking once in 32 h.These results provide a new approach for enhancing the photovoltaic performances of DSSCs based on single dye.Two new coordination polymers,{[Zn4(DPBT)2(BDC)4]·(H2O)·2(DPBT)}n(1),{[Cd2(DPBT)2(BDC)2]·(DMA)}n(2),have been obtained from the self-assembly of the heterocycle ligand DPBT with different d10 metal ions,in the presence of coligand(DPBT=4,7-di(4-pyridyl)-2,1,3-benzothiadiazole,BDC=1,4-benzene dicarboxylate,DMA=N,N-dimethylacetamide).Those d10 metal ions incorporated fluorescent ligand show excellent fluorescence.Subsequently,both compounds are developed as highly selective and sensitive probe for detection of PA(picric acid)in DMF(N,N-dimethylformamide)solution based on fluorescence quenching with a detection limit of 0.01 and 0.1 μM,respectively,which are better than the published result.The PL(photofluorescent)titration upon the addition of nitrate salts to corresponding emulsions were also conducted.Interestingly,the emission spectra exhibit that both compounds possess fluorescent turn-on or turn-off sensing behavior for metal ions Compared with the other metal ions,Fe3+ and Cr3+ and Al3+ show significant turn off and turn on effect on the fluorescence intensity,respectively,for 1.Except Fe3+,the fluorescence intensity of 2 progressively enhance with the increase from 0.01 to 0.5 mM in the concentrations of the Al3+,Cr3+ and Pd2+ ions with quenching percentage(QP)of 8.4,7.4 and 4.8,respectively,showing that 2 as a turn-on fluorescent sensory material has greater sensitivity for those metal ions,up to now.These results indicate that the as-prepared compounds have great potential to be developed as the favorable sensor for detection of PA and metal ions.