Reordering and Disordering of the Copper Hexadecafluorophthalocyanine (F16CuPc) Monolayer by K Doping

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• 作者：Yuri Hasegawa ; Yoichi Yamada ; Masahiro Sasaki
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：October 23, 2014
• 年：2014
• 卷：118
• 期：42
• 页码：24490-24496
• 全文大小：415K
• ISSN：1932-7455

文摘

Potassium (K)-induced structural and electronic modifications in the copper hexadecafluorophthalocyanine (F₁₆CuPc) monolayer were investigated by scanning tunneling microscopy and photoemission spectroscopy. The adsorption of K was found to cause a rearrangement of the molecular ordering in the F₁₆CuPc monolayer, depending on the K concentration. For doping with one to two K atoms per molecule, K adsorbs in the intermolecular region adjacent to the aza-bridging nitrogen, forming new ordered phases. A further increase in K coverage causes the on-top adsorption of K, which in turn disorders the monolayer. The photoemission spectrum of the K-doped phase exhibits a small density of states immediately below the Fermi level. Both the formation of the new states and the K-induced structural ordering or disordering of the molecular layer may be responsible for the reported alteration of the macroscopic electronic conductivity.