We have synthesized water-soluble polymer, poly[(9,9-bis((6′-(N,N,N-trimethylammonium)hexyl)-2,7-fluorene))-alt-bisphenylfumaronitrile]dibromide (AHF-alt-PFN), the polymer typically obtained by the Suzuki type of polymerization reaction and shows good solubility in methanol. Bulk heterojunction polymer solar cells (BHJ-PSCs) fabricated by using water soluble conjugated polymer and positive (Cs+) and negative (F−, CO2− 3) charge ions doping as an interfacial layer for poly(3-hexylthiophene):phenyl-C61 butyric acid methyl ester (P3HT:PCBM). We have achieved an enhancement of the short circuit density and power conversion efficiency in solar cell by introducing poly(AHF-alt-PFN) layer between the active layer and the cathode metal. The device with poly(AHF-alt-PRN) layer containing F−,CO2− 3 showed a short circuit current density more 1.3, 2.3 times higher than those of the device without poly(AHF-alt-PFN)+ion layer. We explain the better performance in solar cell with poly(AHF-alt-PFN)+ion layer was due not only to the increase of electron mobility in poly(AHF-alt-PFN) layer but also to the decrease of the electron barrier near cathode by the addition of the negative ions.
我们合成了
水溶性聚合物聚[(9,9-双((6′-(N,N,N-三甲基
铵)己基)-2,7-
芴))-盐基双
苯酚腈]二
溴化物(AHF-alt-PFN),这种聚合物通常通过铃木式聚合反应获得,在
甲醇中具有良好的溶解性。利用
水溶性共轭聚合物以及正(Cs+)负(F-、
CO2-3)电荷离子掺杂作为聚(
3-己基噻吩):苯基-C61
丁酸甲酯(P3HT:PCBM)的界面层,制造出了块状异质结聚合物太阳能电池(BHJ-PSCs)。通过在活性层和阴极
金属之间引入聚(AHF-alt-PFN)层,我们提高了太阳能电池的短路密度和功率转换效率。含有 F-, - 3 的聚(AHF-alt-PRN)层的器件的短路电流密度比没有聚(AHF-alt-PFN)+离子层的器件分别高出 1.3 倍和 2.3 倍。我们解释说,含有聚(AHF-alt-PFN)+离子层的太阳能电池之所以具有更好的性能,不仅是因为聚(AHF-alt-PFN)层中电子迁移率的增加,还因为负离子的加入降低了阴极附近的电子势垒。