2014年
アルカンチオール自己組織化単分子膜の電子状態と励起電子ダイナミクス
表面科学
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- 巻
- 35
- 号
- 8
- 開始ページ
- 432
- 終了ページ
- 437
- 記述言語
- 日本語
- 掲載種別
- DOI
- 10.1380/jsssj.35.432
- 出版者・発行元
- 公益社団法人 日本表面科学会
The electronic structures of alkanethiolate self-assembled monolayers (SAMs) associated with their molecular-scale geometry have been evaluated by combining two types of scanning tunneling spectroscopy (STS): current-voltage (I/V) and distance-voltage (z/V) spectroscopy. In the STS spectra, in addition to electronic states originating from alkyl-chain and SAM/Au interface, an image potential state (IPS) formed in a vacuum gap is clearly observed. The result is well consistent with our two-photon photoemission spectroscopy (2PPES) measurements. Furthermore, by using time- and angle-resolved 2PPES, we found that the electron excited into IPS is highly separated from the Au substrate and has an extremely long lifetime of the order of 100 ps owing to the excellent insulating property of SAM. The lifetime can be prolonged by increasing the length of alkyl chain and by lowering the substrate temperature, which indicates that the degree of electron separation can be precisely controlled by designing the molecular layer.
- リンク情報
- ID情報
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- DOI : 10.1380/jsssj.35.432
- ISSN : 0388-5321
- CiNii Articles ID : 130004678725
- CiNii Books ID : AN00334149