当前位置: X-MOL 学术Eur. Polym. J. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Highly Crystalline Two-Dimensional Copolymer with Dominant Face-on Orientation for High Performance Polymer Solar Cells
European Polymer Journal ( IF 6 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.eurpolymj.2020.109799
Shih-Hao Wang , Rathinam Raja , Shih-Wei Yu , Ru-Jong Jeng , Jyh-Chien Chen , Syang-Peng Rwei , Leeyih Wang

Abstract We designed and synthesized a novel series of two-dimensional (2D) conjugated polymers (P1-2T, P2-2T2F and P3-4T2F) containing 2,2′-bithiophene (2T) and 3,3′-difluoro-2,2′-bithiophene (2T2F) as donor units, and 4,7-benzo[c][1,2,5]thiadiazole (BT) and 4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole (DTBT) as acceptor units appended with conjugated vinyl-terthiophene (VTT) side chain. We comprehensively investigated the effect of fluorination and thiophene (T) π-spacer on the optoelectronic properties and photovoltaic performance of the resulting copolymers. In comparison with non-fluorinated polymer P1-2T, the fluorinated polymer P2-2T2F and P3-4T2F had down shifted highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels with an enhanced absorption band. Moreover, 2D grazing incidence wide-angle X-ray scattering and space charge limited current measurement showed that the presence of thiophene π-spacer in P3-4T2F promoted dominant face-on orientation, high crystallinity and enhanced hole mobility, compared with P2-2T2F. As a result, the inverted polymer solar cell based on the P3-4T2F:PC61BM blend exhibited a high power conversion efficiency (PCE) of 6.66% with a Jsc of 12.99 ± 0.30 mA/cm−2. In contrast, the P1-2T:PC61BM and P2-2T2F:PC61BM devices without π-spacer showed a PCE of 2.22% and 0.95%, respectively. The PCE of the P3-4T2F:PC61BM device was further improved to 6.89% by using a polyethylenimine ethoxylated (PEIE) interlayer between ITO and ZnO. This study reinvigorates the key modulation of a 2D conjugated polymer with improved photovoltaic performance.

中文翻译:

用于高性能聚合物太阳能电池的具有主要面朝上取向的高结晶二维共聚物

摘要 我们设计并合成了一系列包含 2,2'-联噻吩 (2T) 和 3,3'-二氟-2 的新型二维 (2D) 共轭聚合物(P1-2T、P2-2T2F 和 P3-4T2F), 2'-联噻吩 (2T2F) 作为供体单元,4,7-苯并[c][1,2,5]噻二唑 (BT) 和 4,7-二(噻吩-2-基)苯并[c][1 ,2,5]噻二唑 (DTBT) 作为受体单元,附加有共轭乙烯基三噻吩 (VTT) 侧链。我们全面研究了氟化和噻吩(T)π-间隔基对所得共聚物的光电性能和光伏性能的影响。与非氟化聚合物P1-2T相比,氟化聚合物P2-2T2F和P3-4T2F的最高占据分子轨道(HOMO)和最低未占据分子轨道(LUMO)能级下移,吸收带增强。而且,2D掠入射广角X射线散射和空间电荷限制电流测量表明,与P2-2T2F相比,P3-4T2F中噻吩π-间隔基的存在促进了主导面取向、高结晶度和增强的空穴迁移率。因此,基于 P3-4T2F:PC61BM 混合物的倒置聚合物太阳能电池表现出 6.66% 的高功率转换效率 (PCE),Jsc 为 12.99 ± 0.30 mA/cm-2。相比之下,P1-2T:PC61BM 和 P2-2T2F:PC61BM 器件没有 π-spacer 的 PCE 分别为 2.22% 和 0.95%。通过在 ITO 和 ZnO 之间使用聚乙烯亚胺乙氧基化 (PEIE) 夹层,P3-4T2F:PC61BM 器件的 PCE 进一步提高到 6.89%。这项研究重振了具有改进光伏性能的二维共轭聚合物的关键调制。
更新日期:2020-07-01
down
wechat
bug