富勒烯衍生物[6, 6]-苯基-C61-丁酸甲酯(PCBM)在有机聚合物太阳能电池的电子输运方面扮演着非常重要的角色.利用密度泛函理论计算了PCBM的近边X射线吸收精细结构谱及未占据分子轨道.通过对比计算得到的PCBM分子中不等价碳原子的谱线总和,将该分子的主要共振吸收峰进行了标定.我们分析了第一个π*共振吸收峰高能区右肩吸收峰的来源,并确定了该吸收峰主要来自于C60笼子中碳原子能量较高的未占据分子轨道的跃迁. Fullerene-derivative [6, 6]-phenyl-C61-butyric acid methyl ester (PCBM) plays an important role in terms of electron transport in polymer solar cells. The electronic structure of PCBM is of much importance to investigate. In this study, the near-edge X-ray absorption fine structure spectroscopy and unoccupied orbitals of PCBM were researched with density functional theory. By comparing the calculated sum spectra of nonequivalent carbon atoms, we assigned the main resonances of PCBM. The origin of the shoulder in the right side of the first π* resonance was analyzed, and the results showed that this absorption peak was mainly contributed by the transitions to higher unoccupied orbitals of the unmodified carbons in the C60 cage
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