A series of spiro-1,3-dioxolanofullerenes with 6-, 7-, 8-, and 12-membered ring were synthesized by the acid-catalyzed reaction of fullerene epoxide with cycloalkanones. The LUMO levels of these fullerenes are 0.07–0.08 eV lower than that of PCBM, due to the electron-withdrawing ester directly bonded to the C60 core. However, good power conversion efficiencies of 2.9 and 5.4% were obtained for the P3HT and PTB7 blend films, respectively. Characterization by solubility and morphology aided the understanding of the limiting factors behind the photovoltaic performance.
通过
富勒烯环氧化物与环烷酮的酸催化反应,合成了一系列具有 6、7、8 和 12 元环的螺-
1,3-二氧戊环富勒烯。这些
富勒烯的 LUMO
水平比 PCBM 低 0.07-0.08 eV,原因是 C60 核心直接键合了抽电子酯。然而,P3HT 和 PTB7 混合薄膜获得了良好的功率转换效率,分别为 2.9% 和 5.4%。通过对溶解度和形态进行表征,有助于了解光伏性能背后的限制因素。