【摘要】 以烷氧基和苯基作为一维和二维取代基来构造非对称型的苯并二噻吩(BDT)结构,以三联噻吩作为偶联π桥,以氰基乙酸异辛酯作为封端基团,设计并合成了基于非对称型BDT的小分子DCA3TPBDTOC16和DCA3TFPBDTOC16-m,并首次将该类型的小分子作为活性层给体材料应用到有机太阳能电池器件中。两个小分子均表现出良好的热稳定性,较宽的吸收峰和较为平整的平面构型,最终,小分子DCA3TPBDTOC16表现出0.30%的光电转换效率(PCE),相应的开路电压(VOC)为0.387V,短路电流密度(JSC)为2.126mA/cm2,填充因子(FF)为29.39%,在此基础上,在BDT侧链上的苯环取代基上引入F原子来优化来调控分子能级,最终小分子DCA3TFPBDTOC16-m表现出了1.20%的PCE值,VOC为1.007V,JSC为1.61 mA/cm2,FF为29.34%,其中VOC=1.007V与目前为止基于苯并二噻吩的小分子给体材料所表现出的最高开路电压值相近。这些结果表明,基于非对称型BDT的小分子给体材料在有机太阳能电池应用上具有巨大的潜力。更多还原

【Abstract】 In this paper,two small molecules DCA3 TPBDTOC16 and DCA3 TFPBDTOC16-m were designed and synthesized based on asymmetric benzodithiophene(BDT)with trifunctional thiophene asπbridge and isooctyl cyanoacetate as the capping group.The asymmetric BDT structure was constructed by alkoxy and phenyl as the one-dimensional and two-dimensional substituents respectively.The small molecules of this type were applied to active layer donor materials in organic solar cell devices.Both small molecules showed good thermal stability,broad absorption peak and relatively flat planar configuration.Finally,the small molecule DCA3 TPBDTOC16 showed a photoelectric conversion efficiency(PCE)of 0.30%,a corresponding open circuit voltage(VOC)of0.387 V,a short-circuit current density(JSC)of 2.126 mA/cm2,and a fill factor(FF)of 29.39%.Based on this,the F atom was introduced into the side chain of small molecular DCA3 TPBDTOC16 to optimize the molecular level.Finally,the molecule DCA3 TFPBDTOC16-m showed a PCE value of 0.60%,aVOCof 1.007 V,a JSCof 1.61 mA/cm2 and a FF of 59.34%,among which the VOCof 1.007 Vis similar to the highest VOCvalue exhibited by the benzodithiophene-based small molecule donor materials up to now.These results prove that the small molecules donor materials based on asymmetric BDT have great potential in achieving high performance in organic solar cells.更多还原