Synergistic enhancement in open-circuit voltage and photovoltaic performance via linear naphthyldithiophene building block
作者:PanFeng Gao、Yu Zhang、Jianlin Ni、Bing Zheng、LiYong Wang、Haiyan Fu、Lijun Huo
DOI:10.1016/j.polymer.2022.124639
日期:2022.4
Among various photovoltaic building blocks, fused aromatic units such as benzo[1,2-b:4,5-b']dithiophene (BDT) based conjugated polymers have exhibited excellent photovoltaic properties in organic solar cells (OSCs) due to their better delocalization along polymeric backbones. However, further extending conjugation in fused aromatic units appears some unavailable drawbacks such low-solubility, low-antioxidation
在各种光伏构件中,苯并[1,2-b:4,5-b']二噻吩(BDT)基共轭聚合物等稠合芳族单元由于其更好的离域性而在有机太阳能电池(OSC)中表现出优异的光伏性能沿着聚合物主链。然而,在稠合芳族单元中进一步扩展共轭会出现溶解度低、抗氧化能力低、HOMO能级高等一些不可用的缺点,对相应的开路电压(V oc) 和功率转换效率 (PCE)。在这里,我们设计并合成了两种新型宽带隙聚合物 PBDT-3T 和 PNDT-3T,使用苯并二噻吩和萘基二噻吩作为供体单元,酯取代的三重噻吩作为受体单元。与参考的基于 BDT 的聚合物相比,发现 NDT 单元不仅扩展了主链的共轭度,增加了聚合物的结晶度和载流子迁移率,而且还增加了基于 NDT 的光伏器件的V oc。最终短路电流和填充因子为 15.90 mA cm -2和63.7%,最终PCE达到9.72%,表现出比BDT单元聚合物更好的优势。因此,采用无损检测作为光伏构件被证明是协同改进V