Charge-Transfer Dynamics at Model Metal-Organic Solar Cell Surfaces

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• 作者：J. Ben Taylor ; Louise C. Mayor ; Janine C. Swarbrick ; James N. O'Shea ; Joachim Schnadt
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：November 8, 2007
• 年：2007
• 卷：111
• 期：44
• 页码：16646 - 16655
• 全文大小：537K
• 年卷期：v.111,no.44(November 8, 2007)
• ISSN：1932-7455

文摘

The "core-hole clock" implementation of resonant photoemission has been used to investigate the charge-transfer dynamics of bi-isonicotinic acid molecules (4,4'-dicarboxy-2,2'-bipyridine) adsorbed on a rutile TiO₂(110) surface containing varying densities of gold islands. In the presence of, nominally, a few monolayersof gold there exists a strong coupling between the adsorbed molecules and the surface. This is derived fromthe measurement of a <3 fs charge-transfer time for the injection of a core-excited electron into the substrate.This ultrafast charge-transfer time is quenched for a fraction of the molecules upon the addition of only a fewfurther monolayers of gold. There is evidence to suggest that this effect derives from a change in the bondingconfiguration of bi-isonicotinic acid molecules. However, results also support the occurrence of ultrafastback-transfer from Au states to core-excited unoccupied molecular states.