Mesoporous silicon exchanges electrons extensively and reversibly with adsorbed species, e.g., NO2 and NH3. Such an exchange has been reported for systems that maintain their original p or n character. In the present case, a solid, which is a p-type semiconductor in bulk, converts to a "near insulator" when nanostructured. The near insulator may adopt either a p or an n nature with electron exchange, depending on the type of adsorbed molecule
A Nearly Insulator Nanostructured Porous Silicon becomes either a p or an n-Type Semiconductor upon Gas Adsorption
CHIESA, Mario;GIAMELLO, Elio;GOBETTO, Roberto;UGLIENGO, Piero;VIALE, Alessandra
2005-01-01
Abstract
Mesoporous silicon exchanges electrons extensively and reversibly with adsorbed species, e.g., NO2 and NH3. Such an exchange has been reported for systems that maintain their original p or n character. In the present case, a solid, which is a p-type semiconductor in bulk, converts to a "near insulator" when nanostructured. The near insulator may adopt either a p or an n nature with electron exchange, depending on the type of adsorbed molecule
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