Huang Jinfeng, Lin Zhenkun, Feng Wenhuai, Wang Wen
Fujian Key Laboratory of Polymer Materials, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China.
Polymers (Basel). 2019 Jan 2;11(1):55. doi: 10.3390/polym11010055.
A series of bithiophene (2T)-based D-A₁-D-A₂ terpolymers with different A₂ moieties were prepared via direct arylation reaction. In these terpolymers, pyrrolo[3,4-]pyrrole-1,4-dione (DPP) was selected as the first electron-accepting (A₁) moiety, 2,1,3-benzothiadiazole (BT) or fluorinated benzothiadiazole (FBT) or octyl-thieno[3,4-]pyrrole-4,6-dione (TPD) or 2,1,3-benzoselendiazole (SeT) was selected as the second electron-accepting (A₂) moiety, while bithiophene with hexyl side chain was used as the electron-donating moiety. The UV-vis absorption, electrochemical properties, blend film morphology, and photovoltaic properties were studied to explore the effects of the A₂ moiety. It is shown that these terpolymer films exhibit broad absorption (350⁻1000 nm), full width at half-maximum of more than 265 nm and ordered molecular packing. Varying the A₂ moiety could affect the energy levels and blend film morphology leading to different polymer solar cell (PSC) performances of these (2T)-based D-A₁-D-A₂ terpolymers. As a result, the highest of 10.70 mA/cm² is achieved for Polymer 1 (P1) with BT as A₂ moiety, while the higher highest occupied molecular orbital (HOMO) level limits the open circuit voltage () and leads to a power conversion efficiency (PCE) of 3.46%.
通过直接芳基化反应制备了一系列具有不同A₂基团的基于联噻吩（2T）的D-A₁-D-A₂三元共聚物。在这些三元共聚物中，吡咯并[3,4-c]吡咯-1,4-二酮（DPP）被选作第一个电子受体（A₁）基团，2,1,3-苯并噻二唑（BT）或氟化苯并噻二唑（FBT）或辛基噻吩并[3,4-c]吡咯-4,6-二酮（TPD）或2,1,3-苯并硒二唑（SeT）被选作第二个电子受体（A₂）基团，而带有己基侧链的联噻吩用作供电子基团。研究了紫外-可见吸收、电化学性质、共混膜形态和光伏性质，以探究A₂基团的影响。结果表明，这些三元共聚物薄膜表现出宽吸收（350-1000 nm）、半高宽超过265 nm以及有序的分子堆积。改变A₂基团会影响能级和共混膜形态，导致这些基于（2T）的D-A₁-D-A₂三元共聚物具有不同的聚合物太阳能电池（PSC）性能。因此，以BT作为A₂基团的聚合物1（P1）实现了最高10.70 mA/cm²的电流密度，而较高的最高占据分子轨道（HOMO）能级限制了开路电压（Voc），并导致功率转换效率（PCE）为3.46%。
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