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    基于噻吩并吡嗪类的-(D-A1)m-(D-A2)n-型三元无规共聚物的合成及光电性能

    Synthesis and Photo-Electrical Properties of the -(D-A1)m-(D-A2)n-Type Random Terpolymers Based on Thienopyrazine

      摘要
    • 摘要: 选用苯并二噻吩（BDT）类衍生物作为给体单元D，并选用噻吩并吡咯二酮（TPD）类衍生物（A1）和噻吩并吡嗪（TP）类衍生物（A2）作为共同的受体单元，通过Stille偶联聚合制备了-（D-A1）m-（D-A2）n-型三元无规共聚物，并同时合成了基于BDT和TP的二元共聚物。采用核磁共振氢谱（1H-NMR）、凝胶液相色谱（GPC）和热重（TG）表征聚合物的结构与性能；采用紫外-可见光谱和循环伏安法测试聚合物的光电性能，研究了以这类聚合物为给体材料制备的太阳能器件的光伏性能。结果表明：三元无规共聚物具有较高的相对分子量和热稳定性，在太阳光范围具有强而宽的吸收，同时具有相对较低的最高电子占用轨道HOMO和最低电子占用轨道LUMO能级。基于三元无规共聚物P2的器件，其光电转换效率可达到1.22%，优于相应的二元共聚物P1的1.15%。

       

      Abstract: -(D-A1)m-(D-A2)n-type random terpolymers were prepared by Stille coupling polymerization,in which benzodithiophene (BDT) derivative was chosen as donor unit(D) and thienopyrroledione (TPD) derivative (A1) and thienopyrazine (TP) derivative (A2) were chosen as corporate acceptor units.Meanwhile,the corresponding copolymer based on BDT and TP was prepared.The polymers were characterized by 1H-NMR,GPC and TG.The photo-electrical properties were measured by UV-visible spectra and cyclic voltammetric curves.The solar cells with these polymers as donor materials were fabricated and the corresponding photovoltaic performance was studied.Results show that the terpolymers have higher relative molecular weight and thermal stability.At the same time,they have stronger and broader absorption under the solar light and relative deeper HOMO (LUMO) energy levels.As a result,the photoelectric conversion efficiency (PCE) of 1.22% based on the random terpolymer P2 is better than the PCE of 1.15% based on the bipolymer P1.

       

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