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Proceedings Paper

Heterosupramolecular chemistry: long-lived light-induced charge separation by vectorial electron flow in a heterotriad
Author(s): Xavier Marguerettaz; S. Nagaraja Rao; Gareth Redmond; Donald Fitzmaurice
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Paper Abstract

A redox molecule (acceptor) is attached, using a surface chelate (spacer), to a semiconductor electrode (donor). Such donor-spacer-acceptor complexes, referred to as heterodyads, offer the prospect of testing important aspects of the theory of heterogeneous electron transfer (ET) at the semiconductor electrode-liquid electrolyte interface (SLI). Specifically, potentiostatically controlled ET from the conduction band of the semiconductor electrode to a redox species held at a fixed distance and orientation with respect to the SLI is possible. Extending the above approach, a modified SLI has been prepared at which potentiostatically controlled vectorial electron flow leading to long-lived charge trapping is possible. Specifically, a spacer-acceptor I-acceptor II complex is adsorbed at a semiconductor electrode to form a heterotriad. Application of a potential more negative than the potential of the conduction band at the SLI results in acceptor I mediated reduction of acceptor II. The reduced form of acceptor II is stabilized and long-lived charge trapping results. Efficient light induced charge separation by vectorial electron flow at the above modified SLI is also possible.

Paper Details

Date Published: 9 September 1994
PDF: 10 pages
Proc. SPIE 2255, Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII, (9 September 1994); doi: 10.1117/12.185433
Show Author Affiliations
Xavier Marguerettaz, Univ. College Dublin (Ireland)
S. Nagaraja Rao, Univ. College Dublin (Ireland)
Gareth Redmond, Univ. College Dublin (Ireland)
Donald Fitzmaurice, Univ. College Dublin (Ireland)

Published in SPIE Proceedings Vol. 2255:
Optical Materials Technology for Energy Efficiency and Solar Energy Conversion XIII
Volker Wittwer; Claes G. Granqvist; Carl M. Lampert, Editor(s)

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