Abstract
AbstractWe report on a study of the conductivity threshold voltage which is observed in the electrical characteristics of (100)‐oriented mesoporous silicon, when a particular measurement configuration is used. By varying the temperature and the atmosphere (i.e. presence of NO2 and NH3 gas), the evolution of the conductivity gap is observed, and the origin of the blockade effect is investigated. It is argued that the conductivity gap arises from positive charges trapped in nanoconstrictions, which inhibit, by Coulomb interaction, the hole current along the longitudinal direction (parallel to the sample surface), where silicon nanocrystals are poorly interconnected. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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