Coverage-Dependent Modification of the Surface Electronic Structure of an Organic-Semiconductor-Adsorbate Layer

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• 作者：Sung-Young Hong ; Po-Chun Yeh ; Ilkyu Lee ; Jaeeun Yu ; Jerry I. Dadap ; Colin Nuckolls ; Richard M. Osgood
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：March 27, 2014
• 年：2014
• 卷：118
• 期：12
• 页码：6214-6225
• 全文大小：636K
• 年卷期：v.118,no.12(March 27, 2014)
• ISSN：1932-7455

文摘

The electronic structure of a hexa-<i>catai>-hexabenzocoronene (HBC)/Cu(111) interface is investigated by two-photon photoemission over a range of coverage from 0 to 2 ML monolayers. It is found that increasing the HBC coverage shifts the vacuum level of the Cu substrate until this shift saturates at a coverage of 2 ML. Over this same range of coverage, the Shockley and the bare-surface Cu(111) image-potential states are shown to be quenched, while new unoccupied states appear and grow in strength with coverage. The use of momentum- and polarization-resolved photoemission spectra reveals that the new states are modified image states.