Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 9: Poster I
HL 9.63: Poster
Montag, 27. März 2006, 15:15–17:45, P3
Transient photocurrents of porous semiconductor electrodes permeated with electrolyte — •Sven Rühle1, Ivan Ivanov2, Valery Skryshevskyy2, Jörg Rappich3, and Thomas Dittrich3 — 1Condensed Matter & Interfaces, Debye Institute, University Utrecht, 3508 TA Utrecht, The Netherlands — 2Taras Shevchenko University, Department of Radiophysics, Volodymyrska st. 64, 01033 Kyiv, Ukraine — 3Hahn-Meitner-Institut, Glienicker Str. 100, 14109 Berlin, Germany
Photocurrent transients were used to investigate electron transport in mesoporous, nanocrystalline TiO_2 and Si films immersed into aqueous electrolyte. The pH and the conductivity of the electrolyte were changed systematically. It is shown that both trapping and recombination depend strongly on the pH. For porous Si, addition of fluoride into the acidic solution lead to an increase of the diffusion coefficients. Values for the effective diffusion constants are evaluated. A numerical model was used to decouple the impact of recombination and trapping on the transient response.