Ultraviolet Photoemission Study of Interaction between Bathocuproine and Calcium
Ultraviolet Photoemission Study of Interaction between Bathocuproine and Calcium
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DOI：
10.1143/jjap.47.1397
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发表时间：
2008-02
影响因子：
1.5
通讯作者：
S. Toyoshima;T. Sakurai;T. Taima;K. Saito;H. Kato;K. Akimoto
中科院分区：
文献类型：
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作者：
S. Toyoshima;T. Sakurai;T. Taima;K. Saito;H. Kato;K. Akimoto
使用两种薄膜：Ca 和 BCP 共沉积膜以及沉积在 Ca 上的 BCP，通过紫外光电子能谱 (UPS) 研究了浴铜灵 (BCP) 和钙 (Ca) 界面处的电子结构。在费米能级附近观察到由 Ca 与 BCP 相互作用引起的新峰。从费米能级测得的BCP最高占据分子轨道(HOMO)的能量位置不随BCP在Ca上的厚度以及BCP与Ca的组成比的变化而变化。与界面态相关的新峰随着 Ca 上 BCP 的厚度以及 BCP 与 Ca 的组成比的变化而移动。这表明界面态是由 Ca 的费米能级与最低未占据分子轨道而不是 HOMO 的相互作用产生的。
The electronic structure at the interface between bathocuproine (BCP) and calcium (Ca) was studied by ultraviolet photoemission spectroscopy (UPS) using two kinds of thin-films: Ca and BCP codeposited film, and BCP deposited on Ca. New peaks caused by the interaction of Ca with BCP were observed near the Fermi level. The energy position of the highest occupied molecular orbital (HOMO) of BCP measured from the Fermi level did not change with the thickness of BCP on Ca and the composition ratio of BCP to Ca. The new peaks related to the interface states shifted with the thickness of BCP on Ca and the composition ratio of BCP to Ca. It is suggested that the interface states are generated by the interaction of the Fermi level of Ca with the lowest unoccupied molecular orbital rather than the HOMO.