Physics – Condensed Matter – Materials Science
Scientific paper
2008-12-29
Physics
Condensed Matter
Materials Science
Abbreviations: 1,8-naphthalene-dicarboxylic anhydride-4, 5- dicarboxylic imide (see also figure 1) 1,4,5,8-naphthalene-tetraca
Scientific paper
When redox active molecules are covalently tethered to the surface of the n-doped silicon, light induces their oxidation by the semiconductor. To visualize this charge separation we have followed the formation and decay of the surface photovoltage by an auxiliary transparent electrode, which serves as a capacitive probe that picks up the transient surface photovoltage. This method has been used in electronics and biophysics but is novel for the surface redox chemistry. The probe provides both the direction of the charge transfer and the resolution of the dynamics. Its application is independent of the optical properties of the semiconductor. Laser initiation of the reaction permits quantitative measurements of the reactions with the rate constants ~108-103 s-1. The electron injection from covalently tethered NTCI(A) molecules into silicon was fast (k >109 s-1). The back electron transfer is poly-disperse with the components ranging from ~10 microseconds and up.
Burtman Vladimir
Pakoulev Andrei V.
Zaslavsky Dmitry
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