Molecular engineering versus energy level alignment: Interface formation between oligothiophene derivatives and a metal substrate studied with photoemission spectroscopy
Molecular engineering versus energy level alignment: Interface formation between oligothiophene derivatives and a metal substrate studied with photoemission spectroscopy
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分子工程与能级排列：用光电子能谱研究低聚噻吩衍生物和金属基材之间的界面形成
DOI：
10.1063/1.1464209
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发表时间：
2002
影响因子：
3.2
通讯作者：
Z. Kafafi
中科院分区：
文献类型：
--
作者：
A. Mäkinen;I. Hill;Motoi Kinoshita;T. Noda;Y. Shirota;Z. Kafafi
用光电子能谱研究了两个系列的低聚噻吩衍生物在银衬底上的薄膜。寡聚噻吩封端与缺电子（dismesitylboryl）或富电子（二苯基甲苯基胺）的部分，以创建分子的电子接受或捐赠的性质，分别。在金属/有机界面上的最高占据分子轨道（HOMO）的位置被发现强烈地依赖于用二均三甲苯基硼基封端的寡聚噻吩的有效π-共轭长度，而在用二苯基甲苯基胺封端的寡聚噻吩中，HOMO的位置与分子长度无关。在所观察到的HOMO特性的差异是由于在两个分子系列的前线轨道的不同化妆。这将特别影响在器件结构中的导体/有机界面处的电荷注入的总能量势垒，例如有机发光二极管、UTI…
Two series of thin films of oligothiophene derivatives grown on Ag substrates have been studied with photoelectron spectroscopy. The oligothiophenes were end-capped with either electron-deficient (dismesitylboryl) or electron-rich (diphenyltolylamine) moieties to create molecules with electron-accepting or -donating properties, respectively. The position of the highest occupied molecular orbital (HOMO) at the metal/organic interface is found to be strongly dependent on the effective π-conjugation length of the oligothiophenes capped with dimesitylboryl groups, whereas in the oligothiophenes capped with diphenyltolylamine, the position of the HOMO is independent of the molecular length. The difference in the observed HOMO characteristics is attributed to the different make-up of the frontier orbitals in the two molecular series. This will particularly affect the overall energy barrier for charge injection at the conductor/organic interface in a device structure, such as an organic light-emitting diode, uti...