Molecular Exchange in a Heteromolecular PTCDA/CuPc Bilayer Film on Ag(111)
Molecular Exchange in a Heteromolecular PTCDA/CuPc Bilayer Film on Ag(111)
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DOI：
10.1021/jp5078104
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发表时间：
2014-11
影响因子：
3.7
通讯作者：
B. Stadtmüller;M. Gruenewald;Julia Peuker;R. Forker;T. Fritz;C. Kumpf
中科院分区：
文献类型：
--
作者：
B. Stadtmüller;M. Gruenewald;Julia Peuker;R. Forker;T. Fritz;C. Kumpf
有机半导体在电子或自旋电子器件中的未来成功，关键取决于控制分子薄膜性质的能力。在这种情况下，金属接触以及由不同有机材料形成的界面同样重要。在Ag(111)表面生长有序的CuPc单层膜上生长的3，4，9，10-二茂铁-四羧酸二酸酐(PTCDA)形成的异分子双层膜有助于提高对这类界面的基本认识。利用互补的实验技术，我们能够揭示跨越这一异分子界面的分子交换。在PTCDA沉积的初始阶段，其中一些分子扩散到CuPc层，并将CuPc分子置换到第二层。这抑制了两种物种之间光滑界面的形成，并导致了第一个随机排列的CuPc分子中结构无序的异分子CuPc-PTCDA膜以及有序的PT。
The future success of organic semiconductors in electronic or spintronic devices depends crucially on the ability to control the properties of molecular thin films. Metal contacts as well as interfaces formed by different organic materials are of equal importance in this context. A model system contributing to the improvement of the fundamental understanding of such interfaces is the heteromolecular bilayer film formed by 3,4,9,10-perylene-tetracarboxylic-dianhydride (PTCDA) grown on a well ordered CuPc monolayer on Ag(111). Using complementary experimental techniques, we are able to reveal a molecular exchange across this heteromolecular interface. At the initial stage of the PTCDA deposition, some of these molecules diffuse into the CuPc layer and displace CuPc molecules to the second layer. This inhibits the formation of a smooth interface between both species and results in a structurally disordered heteromolecular CuPc-PTCDA film in the first and randomly arranged CuPc molecules as well as ordered PT...