Zhong Peng, Ma Xiaohua, Xi He
School of Advanced Materials and Nanotechnology, Xidian University, 266 Xinglong Section of Xifeng Road, Xi'an 710126, Shaanxi, China.
Key Labof Wide Band-Gap Semiconductor Materials and Devices, Xidian University, Xi'an 710071, Shaanxi, China.
Polymers (Basel). 2017 Dec 21;10(1):4. doi: 10.3390/polym10010004.
Construction of ordered electron acceptors is a feasible way to solve the issue of phase separation in polymer solar cells by using vertically-aligned ZnO nanorod arrays (NRAs). However, the inert charge transfer between conducting polymer and ZnO limits the performance enhancement of this type of hybrid solar cells. In this work, a fullerene derivative named C60 pyrrolidine tris-acid is used to modify the interface of ZnO/poly(3-hexylthiophene) (P3HT). Results indicate that the C60 modification passivates the surface defects of ZnO and improves its intrinsic fluorescence. The quenching efficiency of P3HT photoluminescence is enhanced upon C60 functionalization, suggesting a more efficient charge transfer occurs across the modified P3HT/ZnO interface. Furthermore, the fullerene modified hybrid solar cell based on P3HT/ZnO NRAs displays substantially-enhanced performance as compared to the unmodified one and the devices with other modifiers, which is contributed to retarded recombination and enhanced exciton separation as evidenced by electrochemical impedance spectra. Therefore, fullerene passivation is a promising method to ameliorate the connection between conjugated polymers and metal oxides, and is applicable in diverse areas, such as solar cells, transistors, and light-emitting dioxides.
通过使用垂直排列的氧化锌纳米棒阵列（NRAs）构建有序电子受体是解决聚合物太阳能电池中相分离问题的一种可行方法。然而，导电聚合物与氧化锌之间的惰性电荷转移限制了这类混合太阳能电池性能的提升。在这项工作中，一种名为C60吡咯烷三酸的富勒烯衍生物被用于修饰氧化锌/聚（3-己基噻吩）（P3HT）的界面。结果表明，C60修饰钝化了氧化锌的表面缺陷并改善了其固有荧光。C60功能化后，P3HT光致发光的猝灭效率提高，这表明在修饰后的P3HT/氧化锌界面发生了更有效的电荷转移。此外，与未修饰的以及使用其他改性剂的器件相比，基于P3HT/ZnO NRAs的富勒烯修饰混合太阳能电池表现出显著增强的性能，电化学阻抗谱证明这归因于复合的延迟和激子分离的增强。因此，富勒烯钝化是改善共轭聚合物与金属氧化物之间连接的一种有前景的方法，并且适用于多种领域，如太阳能电池、晶体管和发光二极管。
