Perylene Imide Polymer Synthesis And Properties Of The Electron Acceptor Of Research

Polymer solar cells(PSCs) have attracted considerable attention due to their potential for use in low-cost,light-weight,solution-processable,and flexible large-area panels,since the discover of this new type of solar cells,last twenty years ago.However, the challenge for PSCs is relatively low power conversion efficiency due to limited absorption and low charge carrier mobility of organic photvoltaic materials.Perylene diimides are widely used as acceptor materials in organic photvoltaic materials.They have excellent thermal stability,large electron affinity and high electron mobility.We tried to combine these advantages of perylene diimides with processability and flexibility of polymers,synthesizes new polymers containing perylene diimides as photvoltaic materials.1.A new monomer of N,N'-bis(3,4,5-tri-dodecyl-phenyl)-1,7-dibromoperylene 3,4,9,10-tetracarboxylic acid diimide was synthesized.Five polymers,named as PDTT, PTDTT,PTB,PT and PB,were synthesized by Stille,Sonogashira and Suzuki couplings of this monomer with 5,5'-di(tri-n-butylstannyl) dithienothiophene,5,5'-di(ethynyl) dithienothiophene,1,4-diethynylbenzene,bis(tri-n-butylstannyl)acetylene and benzene-1,4-bis(boronic acid) propane-1,3-dioil diester.2.A new kinds of porphyrin and its derivatives were synthesized.A new type of donor-acceptor polymer,named as PTP,was synthesized by Sonogashira coupling of N,N'-bis(2-propoxyethylamine)-1,7-dibromoperylene-3,4,9,10-tetracarboxylic acid diimide with 5,15-diethynyl-10,20-di(3,4,5-tri-dodecyloxy-phenyl)porphyrin(Zinc).3.The prepared monomers and polymers were characterized by using ¹H NMR,¹³C NMR,MS,EA,GPC,TGA,DSC,UV-vis spectra and CV.TGA and DSC results showed these polymers had good thermal stability.UV-vis spectra showed these polymers had a strong absorption in the visible.The CV results showed that these materials were typical N-type semiconductor materials and they had small HOMO-LUMO band gap.4.Electron mobilities 3.1×10^-4 and 7.1×10^-5 cm²V^-1s^-1 were achieved for organic field-effect transistors based on polymer PDTT and PTDTT,respectively.5.All-polymer PSCs were fabricated with perylene diimide polymers,PDTT and PTDTT,as electron acceptor,and P3HT as electron donor.The power conversion efficiency of the PSCs based on the blend of PDTT and PTDTT with P3HT reached 0.43%and 0.51%,respectively,under the illumination of simulated AM1.5,100mW/cm².