Lee Seok Woo, Hussain Md Waseem, Lee Jihoon, Whang Dong Ryeol, Jeong Woo Hyeon, Choi Hyosung, Chang Dong Wook
Department of Industrial Chemistry, Pukyong National University, 48513 Busan, Republic of Korea.
CECS Research Institute, Core Research Institute, 48513 Busan, Republic of Korea.
ACS Appl Mater Interfaces. 2023 Feb 1;15(4):5547-5555. doi: 10.1021/acsami.2c19702. Epub 2023 Jan 23.
A string of monocyanated quinoxaline (Qx)-based D-A-type polymers systematically decorated with electron-attracting chlorine (Cl) atoms was created for use in non-fullerene polymer solar cells (PSCs). First, coupling of the benzodithiophene (BDT) donor and Qx acceptor with the strong electron-attracting cyano (CN) unit at its 5-position yielded the monocyanated reference polymer PB-CNQ. Subsequently, the additional Cl atoms were separately or simultaneously incorporated into the thiophene side groups of the BDT donor and Qx acceptor to create other objective polymers, PBCl-CNQ, PB-CNQCl, and PBCl-CNQCl. The Cl substituents on the BDT donor and Qx acceptor are represented by the names of the polymers. Owing to the favorable contributions of Cl substituents, the inverted-type non-fullerene PSCs based on partially chlorinated PBCl-CNQ (12.80%) and PB-CNQCl (13.93%) exhibited better power conversion efficiencies (PCEs) than the device based on unchlorinated reference PB-CNQ (11.19%). However, a significantly reduced PCE of 9.84% was observed for the device based on PBCl-CNQCl, in which Cl atoms were loaded on both the BDT donor and Qx acceptor at the same time. Hence, these results reveal that optimization of the number and position of Cl substituents in monocyanated Qx-based polymers is essential for enhancing their photovoltaic nature through the synergistic effects between two strong electron-attracting CN and Cl substituents.
制备了一系列基于单氰基喹喔啉（Qx）的D-A型聚合物，这些聚合物系统地用吸电子氯（Cl）原子修饰，用于非富勒烯聚合物太阳能电池（PSC）。首先，苯并二噻吩（BDT）供体与Qx受体在其5位带有强吸电子氰基（CN）单元进行偶联，得到单氰基参考聚合物PB-CNQ。随后，将额外的Cl原子分别或同时引入BDT供体和Qx受体的噻吩侧基中，以制备其他目标聚合物PBCl-CNQ、PB-CNQCl和PBCl-CNQCl。BDT供体和Qx受体上的Cl取代基由聚合物的名称表示。由于Cl取代基的有利作用，基于部分氯化的PBCl-CNQ（12.80%）和PB-CNQCl（13.93%）的倒置型非富勒烯PSC表现出比基于未氯化参考聚合物PB-CNQ（11.19%）的器件更好的功率转换效率（PCE）。然而，对于基于PBCl-CNQCl的器件，观察到PCE显著降低至9.84%，其中Cl原子同时负载在BDT供体和Qx受体上。因此，这些结果表明，优化单氰基Qx基聚合物中Cl取代基的数量和位置对于通过两个强吸电子CN和Cl取代基之间的协同效应增强其光伏性能至关重要。
