Application Of Zinc Porphyrins With Different Receptor Units In Dye-sensitized Solar Cells

Dye-sensitized solar cells?DSSC?are widely studied to utilize solar energy because of their low cost,ease of manufacturing,relatively high photovoltaic efficiency,and the aesthetic characteristics of bright colors and transparency.In DSSC,the sensitizer plays a vital role in the collection of light.Based on the excellent photoelectric properties of porphyrin derivatives,this paper designed zinc porphyrin molecules ZnP1-ZnP4 as the sensitizer of DSCC.The N-atom of the pyridine group of the porphyrin molecule is coordinated with the metal zinc of the porphyrin itself to provide an effective electron supply.The side chain uses a longer alkoxy chain to improve the solubility of the molecule.The acceptor part has a different structure?alkyne Base,cyano and thienyl?to improve its photovoltaic performance.The porphyrin ZnP1-ZnP4 was characterized by ultraviolet-visible absorption spectroscopy?UV-vis?,nuclear magnetic resonance?¹HNMR?,mass spectrometry?MS?,and finally the performance of the assembled battery device was tested and the density functional theory?DFT?research.Experiments show that ultraviolet-visible absorption spectroscopy?UV-vis?finds that ZnP4 with alkynyl and cyano has the broadest absorption spectrum.The introduction of thiophene groups makes ZnP2 show a certain red shift for ZnP1,which shows Radical,cyano and thienyl can improve the absorption spectrum of the molecule.In the end,the photocurrent conversion efficiency exhibited is ZnP4>ZnP3>ZnP2>ZnP1,which shows that the influence of alkynyl groups on photovoltaic performance is greater than that of thiophene groups and cyano groups,and the influence of thiophene groups is greater than cyano groups.The electrochemical impedance shows that ZnP2charge recombination resistance?Rrec?is greater than ZnP1,and ZnP4 charge recombination resistance?Rrec?is greater than ZnP3,indicating that ZnP2 and ZnP4 are more favorable for the suppression of charge recombination.Therefore,the open circuit voltage(V_OC)of ZnP2 is greater than ZnP1,and the V_OC of ZnP4 is greater than ZnP3,and the electron lifetime also shows a similar trend.Finally,the feasibility of the electronic conduction of ZnP1-ZnP4 was proved by DFT,and the trend was consistent with the experiment.This work provides methods and ideas for the design of DSCC sensitizers.