Benzothiadiazole Versus Thiophene: Influence of the Auxiliary Acceptor on the Photovoltaic Properties of Donor–Acceptor‐Based Copolymers,Macromolecular Rapid Communications

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Benzothiadiazole Versus Thiophene: Influence of the Auxiliary Acceptor on the Photovoltaic Properties of Donor–Acceptor‐Based Copolymers
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2017-10-25 , DOI: 10.1002/marc.201700547
Zongbo Li ₁ , Kangkang Weng ₂ , Aihua Chen ₁ , Xiaobo Sun ₂ , Donghui Wei ₃ , Mingming Yu ₃ , Lijun Huo ₂ , Yanming Sun ₂

Affiliation

Two donor–acceptor (D–A) type conjugated copolymers, P1 and P2, are designed and synthesized. A classical benzothiadiazole acceptor is used to replace a thiophene unit in the polymer chain of P1 to obtain P2 terpolymer. Compared with P1, P2 exhibits broader absorption spectra, higher absorption coefficient, deeper lowest unoccupied molecular orbital level, and a relatively lower band gap. As a result, the P2‐based solar cell exhibits a high power conversion efficiency (PCE) of 6.60%, with a short‐circuit current (J _sc) of 12.43 mA cm⁻², and a fill factor (FF) of 73.1%, which are higher than those of the P1‐based device with a PCE of 4.70%, a J _sc of 9.43 mA cm⁻², and an FF of 61.6%.

中文翻译：

苯并噻二唑与噻吩：辅助受体对基于施主-受主的共聚物的光伏性能的影响

设计并合成了两种供体-受体（DA）型共轭共聚物P1和P2。经典的苯并噻二唑受体用于取代P1聚合物链中的噻吩单元，以获得P2三元共聚物。与P1相比，P2具有更宽的吸收光谱，更高的吸收系数，更深的最低未占据分子轨道能级和相对较低的带隙。结果，基于P2的太阳能电池表现出6.60％的高功率转换效率（PCE），短路电流（J _sc）为12.43 mA cm ^-2，填充因子（FF）为73.1％，高于PCE为4.70％，J _sc为9.43 mA cm ^-2和FF为61.6％的基于P1的设备。

更新日期：2017-10-25

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