School of Material Science and Engineering, Ocean University of China, Qingdao, 266100, China.
CAS Key Laboratory of Bio-Based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.
Macromol Rapid Commun. 2018 Nov;39(21):e1800446. doi: 10.1002/marc.201800446. Epub 2018 Aug 24.
The 2D asymmetric benzodithiophene (BDT) unit is used as a donor unit to construct one new polymer PBDTBDD-Th with benzo[1,2-c:4,5-c']dithiophene-4,8-dione (BDD) as acceptor building block. In comparison to the polymer PBDTsTh-BDD with a side chain containing a sulfur atom, the devices based on PBDTBDD-Th/ITIC show better performance due to the introduction of carbon atoms in the side chain, which could weaken the self-aggregations of polymer chains. As a result, the devices based on PBDTBDD-Th/ITIC blends yield power conversion efficiencies (PCEs) over 10%, much higher than those based on PBDTsTh-BDD/ITIC blends (7.09%). The exciton dissociation probabilities (P ) of a device based on PBDTBDD-Th/ITIC blends is 95.3%, which suggests that the device achieves good exciton dissociation and charge transfer. In general, the polymer PBDTBDD-Th shows capability to increase the PCEs of polymer solar cells (PSCs) with a non-fullerene acceptor.
2D 不对称苯并二噻吩（BDT）单元被用作供体单元，构建了一个新的聚合物 PBDTBDD-Th，其受体构建块为苯并[1,2-c:4,5-c']二噻吩-4,8-二酮（BDD）。与含有硫原子侧链的聚合物 PBDTsTh-BDD 相比，基于 PBDTBDD-Th/ITIC 的器件由于侧链中引入了碳原子，从而削弱了聚合物链的自聚集，因此性能更好。结果，基于 PBDTBDD-Th/ITIC 共混物的器件的功率转换效率（PCE）超过 10%，远高于基于 PBDTsTh-BDD/ITIC 共混物的器件（7.09%）。基于 PBDTBDD-Th/ITIC 共混物的器件的激子解离概率（P ）为 95.3%，这表明该器件实现了良好的激子解离和电荷转移。总的来说，该聚合物 PBDTBDD-Th 具有提高非富勒烯受体聚合物太阳能电池（PSC）的 PCE 的能力。
