Synthesis And Characterization Of Meso-Substituted Metal Porphyrin Terpolymer Photovoltaic Materials

Organic Photovoltaic Technology(OPV)stands for Thin Film Photovoltaics and offers attractive prospects for low-cost and aesthetic(color,flexible,uniform,translucent)solar cells that can be printed on large surfaces.In bulk heteroJunction(BHJ)OPV devices,organic electron donors and acceptor molecules are intimately mixed within the photoactive layer.Over the years a variety of isomers(nuclear modified),contracted and expanded porphyrin analogues have been developed,adding unique additional features to the general porphyrin properties.Some derivatives,for example,show significantly enhanced(higher ?)and red-shifted(near-infrared)Q-bands,apparently making them attractive for photovoltaic applications.Porphyrins and their analogs have been successfully implemented in certain device types,especially in dye-sensitized solar cells,but they are still largely unexplored in BHJ organic solar cells.However,recent successes have demonstrated the strong(potential)prospects of porphyrin-based semiconductors as light collection and charge transport materials in such devices.In addition,thiophene and its oligomers are widely used in ?-conJugated systems.Because of their excellent charge transfer characteristics and interesting electronic behavior,they can be used in the field of materials science.The main topics of this topic:1.We synthesized anovel metal zinc porphyrin complex 5,15-dibromo-10,20-di(5-n-hexylthiophene)porphyrin by experiments and then copolymerized with BDT and TT to obtain three terpolymers.The n-hexylthiophene group above the porphyrin unit increases the solubility of the copolymer and investigates the effect of different ratios of the tertiary monomer on the properties of the copolymer.The results showed that the temperatures at which the 5%weight loss of P(HTP-BDT-TT1),P(HTP-BDT-TT2)and P(HTP-BDT-TT3)were 397?,390?,420?.P(HTP-BDT-TTn)has a strong absorption peak around 440 nm and 600-700 nm.The optical band gaps are 1.41 eV,1.48eV,1.59eV.Their electrochemical band gaps are 1.56 eV,1.57 eV,1.72 eV.In addition,the optimal PCE of different additive DIO content based on BHJ structure of ITO/PEDOT:PSS/P(HTP-BDT-TTn):PC71BM/PFN/Al photovoltaic devices was 4.6%,4.54%,2.34%.2.Through the Still coupling reaction,three different proportions of ternary compounds with 5,15-di{5-[(2-hexyldecyl)thio]thiophen} porphyrin units,BDT and TT as the main chain were successfully synthesized P(TTP-BDT-TTn).The results showed that the temperatures at which the 5%weight loss of P(TTP-BDT-TT1)and P(TTP-BDT-TT2)were 361?,370?.P(THTP-BDT-TT2)has a strong absorption peak around 440 nm and 600-700 nm.Their optical band gaps were 1.59 eV,1.60 eV.their electrochemical band gaps were 1.97 eV,2.04 eV.3.Designing different substituted porphyrins and 4-bromo-5-((2-ethylhexyl)oxy)-2-methoxybenzaldehyde to connect to symmetry plane small molecules via ethynyl,and then link them with the other side.Ning Joined to obtain the target products S1 and S2.Their optical band gaps were 1.55 eV,1.53 eV;their electrochemical band gaps were 1.68 eV,1.50 eV.