Ultrafast Photoinduced Electron Transfer across Semiconductor-Liquid Interfaces in the Presence of Electric Fields

Autor:	Randy J. Ellingson, C. L. Tang, K. C. Burr, B. R. Thacker, Yossi Rosenwaks, Arthur J. Nozik
Rok vydání:	1994
Předmět:	Photoluminescence Chemistry business.industry General Engineering Analytical chemistry Molecular physics Photoinduced electron transfer Electron transfer Semiconductor Band bending Depletion region Electric field Physical and Theoretical Chemistry Poisson's equation business
Zdroj:	The Journal of Physical Chemistry. 98:2739-2741
ISSN:	1541-5740 0022-3654
DOI:	10.1021/j100062a007
Popis:	The rates of photoinduced electron transfer from p-InP to Fe(CN)64-/3- acceptors in aqueous electrolyte have been determined as a function of the initial potential drop (Le., band bending ( VBO)) in the semiconductor space charge layer using femtosecond luminescence up-conversion techniques. The effects of electric field on electron transfer were separated from the effects of field-enhanced charge separation and surface recombination through a rigorous numerical solution of the coupled continuity and Poisson equations using a Cray supercomputer. A very strong dependence of the electron-transfer velocity (Set) on VBO was found, Set reached a saturation value of 5 X lo7 cm/s when the initial value of VBO in the dark was 10.5 eV. When the initial value of VBO was set near zero, Set was 9 X lo3 cm/s. Hot electron injection processes appear to play a role in this behavior.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f7b7983e4143a47a4074381796f53071 https://doi.org/10.1021/j100062a007 Zobrazit plný text záznamu