| 초록 |
Organic photovoltaic cells (OPV) are very promising sources in next generation because of low cost, flexibility, and renewable energy applications. Polymer-based OPVs show high performances due to good-film forming, broad absorption, and high charge mobility. However, polymer donors have difficulties in purification and poor reproducibility, such as polydispersity and molecular weight. Small molecule donors have some advantages, including facile synthesis and well-defined structure. Recently, fluorinated benzothiadiazole (F-BT) is used as an accepting unit for donor materials. The introduction of fluorine resulted in better open-circuit voltages in OPVs. Thiadiazolopyridine (TPy) also has higher electron affinity than thiadiazole due to the heterocycle in TPy. In this work, we adopted two units, F-BT and TPy, as accepting units in new small molecule donor materials. Their optical, electrochemical, and photovoltaic properties of small molecules will be systemically investigated. |
