Photoemission of Alq3 and C60 films on Al and LiF∕Al substrates
Photoemission of Alq3 and C60 films on Al and LiF∕Al substrates
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DOI：
10.1063/1.1929884
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发表时间：
2005-07
影响因子：
3.2
通讯作者：
S. Jönsson;W. R. Salaneck;M. Fahlman
中科院分区：
文献类型：
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作者：
S. Jönsson;W. R. Salaneck;M. Fahlman
光电子谱的薄膜Alq3和C60沉积在Al和LiF scinAl基板上进行了研究，以推断与基板的有机膜的相互作用。对于所有的情况下，有证据表明，强相互作用导致形成的界面偶极子。试图解释这些界面偶极子的起源和在每种情况下形成的界面的类型已经通过分析材料的价电子结构和核心水平。当有机薄膜沉积在Al衬底上时，界面偶极子的来源主要是共价相互作用，而当有机薄膜沉积在LiF scinAl衬底上时，有机分子与金属之间通过LiF夹层进行电荷转移。然而，对于足够厚的LiF膜，有机膜和衬底之间没有相互作用。在任何情况下，LiF都不会解离，不像沉积顺序相反的情况。两个电荷转移感生的能隙态和一个电子态。
Photoemission studies of thin films of Alq3 and C60 deposited on Al and LiF∕Al substrates have been performed in order to deduce the interactions of the organic films with the substrates. For all cases there is evidence of strong interaction resulting in the formation of interfacial dipoles. Attempts to explain the origin of these interfacial dipoles and the type of interface formed in each case have been done through analysis of the valence electronic structure and core levels of the materials. The origin of the interfacial dipoles is mainly covalent interaction when the organic films are deposited on Al substrates, and charge transfer between the organic molecules and the metal through the LiF sandwich layer when the organic films are deposited on LiF∕Al substrates. For thick-enough LiF films, however, there is no interaction between the organic films and the substrates. In no case does the LiF dissociate, unlike what is found for the reverse order of deposition. Two charge-transfer-induced gap states a...