A Double-Cable Poly(fluorene-alt-thiophene) with Bay-Substituted Perylenediimide Pendants: An Efficient Interfacial Material in Bulk-Heterojunction Solar Cells

作者：Chen, Naiwu; Lu, Jurong; Wang, Danbei; Zheng, Chaoyue; Wu, Huarui; Zhang, Hongmei^*; Gao, Deqing^*

来源：Macromolecules, 2018, 51(1): 80-90.

DOI：10.1021/acs.macromol.7b01792

• POLYMER PHOTOVOLTAIC CELLS
• CONJUGATED POLYMER
• ELECTRON-TRANSFER
• OPTOELECTRONIC PROPERTIES
• ORGANIC PHOTOVOLTAICS
• PHOTOINDUCED ELECTRON
• DIBLOCK COPOLYMER
• FUNCTIONAL-GROUPS
• CHARGE-TRANSPORT
• BUILDING-BLOCKS

A solution-processable double-cable polymer (PFT-PDI), composed of the backbone poly(fluorene-alt-hiophene) (PFT), the n-butoxyl linker, and the pendants perylenediimides (PDI), was developed. PFT-PDI was almost nonconductive with the hole and electron mobilities in the order of 10(-10). There was no charge transfer but energy transfer from the donor PFT chain to the acceptor PDI units. With a hole-transporting channel from the stacked PFT units and an electron-transporting channel along PDI chain, PFTPDI at the P3HT/PCBM interface facilitated the effective charge generation from P3HT excitons and charge transporting and enhanced the cell photocurrent. The encapsulated cell ITO/MoO/P3HT:PCBM:PFT-PDI/LiF/Al with doping PFT-PDI of 3 wt % demonstrated the maximum power conversion efficiency (PCE) of 4.50%, increasing by 27.5%, relative to PCE of 3.53% from the cell without doping. The PFT-PDI doping much improved the cell's stability with the loss of the initial PCE of 5.8%, in contrast to 29.7% from the reference device after being stored for 7 days.

• 出版日期2018-1-9
• 单位南京邮电大学