In this study, a panchromatic absorptive conjugated terpolymer, BDTID-BDT3MT, is synthesized, which consists of electron-donating benzodithiophene (BDT), isoindigo (ID) as a strong electron-accepting unit, and methyl-3-thiophenecarboxylate (3 MT) as a weak electron-accepting unit. By combining these three monomers into the structure of a conjugated terpolymer, the absorption spectrum of BDTID-BDT3MT is induced to exhibit an unusually broad, strong, and uniform band in the wavelength interval from 300 to 750 nm, which helps achieving highly efficient light harvesting under solar illumination. The intriguing panchromatic absorption behavior of BDTID-BDT3MT was explained on the basis of theoretical calculations using simplified repeating units. Polymer solar cells (PSCs) based on BDTID-BDT3MT as a donating polymer and non-fullerene acceptors (e.g., ITIC-4F) exhibited a high power conversion efficiency (PCE) of 5.38%, high open circuit voltage (V_oc) of 0.88 V, and short circuit current density (J_sc) of 13.74 mA/cm², while PSCs based on ternary blend systems consisting of BDTID, BDT3MT, and ITIC-4F exhibited lower PCE and J_sc of 3.74% and 11.15 mA/cm², respectively. The superior performance of PSCs based on BDTID-BDT3MT can be attributed to their high light harvesting efficiencies and relatively more favorable nano-phase film morphologies. Our results establish that BDT, ID, and 3 MT units serve as useful building blocks in the structure of conjugated terpolymers due to their remarkably broad panchromatic absorption band.

在这项研究中，合成了全色吸收共轭三元共聚物BDTID-BDT3MT，它由给电子的苯并二噻吩（BDT），作为强电子接受单元的异靛蓝（ID）和3-噻吩甲酸甲酯（3 MT）组成。作为弱电子接受单元。通过将这三种单体结合到共轭三元共聚物的结构中，BDTID-BDT3MT的吸收光谱被诱导在300至750 nm的波长间隔内显示出异常宽，强且均匀的谱带，从而有助于实现高效的光收集在阳光下。BDTID-BDT3MT有趣的全色吸收行为在使用简化重复单元的理论计算的基础上进行了解释。基于BDTID-BDT3MT作为给体聚合物和非富勒烯受体（例如ITIC-4F）的聚合物太阳能电池（PSC）表现出5.38％的高功率转换效率（PCE ），0.88的高开路电压（V _oc） V，短路电流密度（J _sc）为13.74 mA / cm ²，而基于由BDTID，BDT3MT和ITIC-4F组成的三元共混体系的PSC的PCE和J _sc较低，分别为3.74％和11.15 mA / cm ²， 分别。基于BDTID-BDT3MT的PSC的卓越性能可以归因于它们的高光收集效率和相对更有利的纳米相膜形态。我们的结果表明，由于BDT，ID和3 MT单元的全色吸收带非常宽，因此它们可作为共轭三元共聚物结构中的有用构建基块。