Synthesis And Performance Research Of Organic Photoelectric Materials Based On Triphenylamine Derivatives

As we know,the reserves of traditional energy are not infinite and refreshable,along with the large-scale production and excessive use of it,traditional energy increasingly exhausted,for the sustained development of human society,scientific research workers urgently to seek and develop alternative new energy.Among them,solar energy has received a strong response of the society from all walks of life because of its characteristics of wide sources,renewable,natural pollution-free and so on.Organic solar cells(OSCs)as an important new energy has become a research hotspot,but if the commercial road need to be succeed,it still have many difficulties need to be solved,especially in terms of the efficiency of all OSCs devices need to meet the minimum requirements of industrialization,This makes it become one of the categories to competed to study.On this background,we synthesized some dye sensitizer on the basis of the triphenylamine derivatives,which were used as photosensitizer for dye sensitized solar cells,the synthesized compounds of its structure were confirmed using nuclear magnetic resonance and mass spectra.The optical physics,electrochemical,and photovoltaic performance of the dyes were studied by using ultraviolet spectrum,fluorescence spectra,cyclic voltammograms and photovoltaic devices.The main research contents stated below:1.The triphenylamine derivatives(IDTTPA)with 3D structure has good stereoscopic structure and rich electronic property,applied the groups as electron donor to dye sensitizer,introducing thiophene or second receptor diketopyrrolopyrrole(DPP)respectively,with benzene as the ?-bridge,carboxylic acid as anchor groups(receptor),we synthesized two kinds of dye sensitizer LD1 and LD2 with D-?-A and D-A1-?-A2 structure,respectively.Then,both of them were applied to the dye sensitized solar cell device as photosensitizer,studied the influence of dye performance with the introduction of the second receptor DPP.Results showed that the introduction of the second receptor DPP can further raise the energy conversion efficiency of the dye sensitized solar cell,its efficiency improved by 4.23% of LD1 to 5.19% of LD2,the increase of PCE is due to the introduction of the DPP,its broad spectrum made the device gained higher short circuit current,which is helpful to improve efficiency.This suggests that when designing the structure of the dye sensitizer,the introduction of the second receptor DPP is helpful to obtain higher efficiency.2.Inspired from the exploration of LD1 and LD2,two dye sensitizers XD1 and XD2 with D-?-A1-?-A2 configuration were designed and synthesized.They adopted N,N-di-p-tolylaniline as a new donor unit to replace IDTTPA,which can more effectively inhibit charge from restructuring,so as to prolong the electronic life,enhance the open circuit voltage and efficiency of the battery ultimately.Both of them were applied to dye-sensitized solar cells(DSSCs)device and comprehensive explored its absorption and electrochemical properties as well as photovoltaic performance.Upon the incorporation of an auxiliary DFBT unit into sensitizer XD1,sensitizer XD2 with an auxiliary DPP exhibit a much wider spectral response in the NIR region and the molar extinction coefficient is also higher,all of this earned it a higher short circuit current.Consequently,the sensitizer XD2 obtained 6.14% of the PCE value compared with 5.81% of XD1.