Double-cable Conjugated Polymer Materials Based On Perylene Bisimide And The Single Component Solar Cell Devices

Single-component organic solar cells use one conjugate material as the photo-active layer.Compared with two-component bulk heterojunction solar cells,it can enhance the stability of the cells and simplify the fabrication process,but its photovoltaic performance is far to be optimized.The design and synthesis of single-component conjugate materials and the control of their nanophase separation are important factors to achieve high performance.Therefore,this thesis focuses on material design and synthesis,and improves the energy conversion efficiency of single-component solar cell devices by control the nanophase separation in single-component conjugate materials.The main result are as follows:1.Design and synthesis a double-cable conjugated polymer based on crystalline polythiophene with side units of perylene bisimide.We use a high boiling point solvent dichlorobenzene with a slow evaporation speed to make the polymer have enough time to self-assembly into nanostructures,and its morphology was studied by grazing incidence X-ray diffraction and atomic force microscope.the double-cable polymer formed lamellar structures with a lamellar distance of ? 70 (?) and ?-? distance of ?3.5 (?).Compared with other disordered nanostructures,this ordered structure facilitates the charge transport,which improves photocurrent and energy conversion efficiency.2.Three double-cable conjugated polymers with diketopyrrolopyrrole as the backbone and perylene bisimide as the side unit were designed by copolymerization.The copolymerization unit was changed from one thiophene to two and three thiophenes.The crystallinity of the conjugated backbone controls the nanophase separation in the polymer.The more thiophene on the conjugated backbone,the better crystallinity of the double-cable conjugated polymer,thereby achieving better charge transport and increasing the energy conversion efficiency to 2.12%.