Layer-by-Layer Growth and Photocurrent Generation in Metal鈥揙rganic Coordination Films

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• 作者：Jennifer T. Joyce ; Fathima R. Laffir ; Christophe Silien
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：June 20, 2013
• 年：2013
• 卷：117
• 期：24
• 页码：12502-12509
• 全文大小：345K
• 年卷期：v.117,no.24(June 20, 2013)
• ISSN：1932-7455

文摘

A series of metal鈥搊rganic coordination films with tetra(4-carboxyphenyl)porphyrin (TCPP) and trimesic acid (TMA) ligands and Cu²⁺ ion linkers were grown layer-by-layer on TiO₂-modified indium tin oxide electrodes and the cathodic short-circuit photocurrent that they generate was studied. The layer-by-layer growth was verified by using absorption spectroscopy in the visible and X-ray photoelectron spectroscopy, highlighting the consistent coverage of TCPP in each layer. The photocurrent increases nonlinearly with the number of TCPP layers and with the number of TMA layers introduced as a buffer between TCPP and substrate. These observations are rationalized by considering substrate screening of the TCPP photoexcited state and charge transport across the metal鈥搊rganic multilayers.