Thieno[3,4-b]pyrazine-based low bandgap photovoltaic copolymers: Turning the properties by different aza-heteroaromatic donors
作者:Qiang Peng、Xiangju Liu、Yuancheng Qin、Dan Zhou、Jun Xu
DOI:10.1002/pola.24887
日期:2011.10.15
A new series of low‐bandgap copolymers based on electron‐accepting thieno[3,4‐b]pyrazine (TPZ) and different electron‐donating aza‐heteroaromatic units, such as carbazole (CZ), dithieno[3,2‐b:2′,3′‐d]pyrrole (TPR) and dithieno[3,2‐b:2′,3′‐e]pyridine (TPY), have been synthesized by Suzuki or Stille coupling polymerization. The resulting copolymers were characterized by NMR, elemental analysis, gel permeation
一系列基于电子接受的噻吩并[3,4-b]吡嗪(TPZ)和不同的供电子氮杂杂芳族单元的低带隙共聚物,例如咔唑(CZ),双硫杂[3,2-b]: 2',3'-d]吡咯(TPR)和二噻吩并[3,2-b:2',3'-e]吡啶(TPY)是通过Suzuki或Stille偶联聚合合成的。所得共聚物通过NMR,元素分析,凝胶渗透色谱,热重分析和差示扫描量热法进行表征。紫外可见吸收和循环伏安法测量表明,TPZ基共聚物与TPR的结合具有最佳吸收,这是因为其分子内电荷转移效应最强,带隙最小。还通过密度泛函理论(DFT)计算研究了这些共聚物的D‐A模型化合物的基本电子结构。计算结果也与实验结果吻合良好。基于这些共聚物的聚合物太阳能电池(PSC)的典型结构为ITO / PEDOT:PSS / copolymer:PC在AM 1.5G,100 mW cm -2的照明下为71 BM / Ca / Al 。性能结果表明,具