Developing perylene diimide based acceptor polymers for organic photovoltaics

作者：Liang Ziqi^*; Cormier Russell A; Nardes Alexandre M; Gregg Brian A

来源：Synthetic Metals, 2011, 161(11-12): 1014-1021.

DOI：10.1016/j.synthmet.2011.03.009

• Perylene diimides
• n-Type organic semiconductors
• Electron acceptor
• Solution processable
• Organic photovoltaics

Perylene diimides are known as promising n-type semiconductor building blocks. Here we report the synthesis and characterization of a set of three soluble poly(perylene diimide)s and their preliminary characterization in organic photovoltaic cells. These polymers are made through the polycondensation of perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) with a variety of poly(ethylene glycol) (PEG)- or poly(propylene glycol) (PPG)-based diamine comonomers. The flexible spacer offers increased solubility in organic solvents and allows the perylene core to assume a conformation that promotes favorable cofacial pi-pi interactions. Mixtures of these polymers with the hole-transporting polymer, poly(3-hexylthiophene) (P3HT) result in significant fluorescence quenching. However, the phase separation occurs on a scale too large for a bulk heterojunction solar cell. The PPGylated poly(perylene diimide) shows an unusually low free electron concentration (similar to 1.0 x 10(12) cm(-3)) and therefore makes an excellent model system for future doping studies. These new polymers may have promise as stable electron-conductive layers with large light-absorptivities in solution-processable applications of organic electronics.

• 出版日期2011-6