Synthesis and Characterization of Novel Soluble Fulleropyrrolidine Derivatives and Their Photovoltaic Performance
摘要:
Currently, [60] fullerene derivatives are the focus of considerable research due to their important roles in many fields, especially material science. In this study, we synthesized the following two novel fulleropyrrolidine derivatives: C-60-fused N-methyl-(4-hexyloxybenzen-2-y1) pyrrolidine, (p-HOPF) and C-60-fused N-methyl-(2-hexyloxybenzen-2-y1) pyrrolidine, (o-HOPF). Structural assignments of the two fullerene derivatives were made through H-1 NMR and FAB-MS. We also measured the optical and electrochemical properties of p-HOPF and o-HOPF through UV/Vis spectrophotometry and cyclic voltammetry. We found that the difference in the position of the alkoxyl substituent on the phenyl ring greatly affects the characteristics of the molecules. In particular, from the H-1 NMR spectrum, we found that the hydrogen atoms on the carbons adjacent to the oxygens in p-HOPF and o-HOPF have completely different chemical environments. In order to study the effects of the substituent group positions on photovoltaic performance, photovoltaic devices were fabricated. The highest power conversion efficiency, 0.71%, was achieved when using o-HOPF as the electron acceptor.