Pressure-induced phase transition in porous silicon
High pressure studies of porous silicon reveal that a phase transition occurs at ∼170 kbar. The phase transition is detected by an abrupt change in color of porous silicon from orange-yellow to black. Photoluminescence measurements show an initial blue shift of the luminescence peak. At ∼25 kbar the...
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Veröffentlicht in: | Applied physics letters 1993-10, Vol.63 (16), p.2260-2262 |
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Hauptverfasser: | , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | High pressure studies of porous silicon reveal that a phase transition occurs at ∼170 kbar. The phase transition is detected by an abrupt change in color of porous silicon from orange-yellow to black. Photoluminescence measurements show an initial blue shift of the luminescence peak. At ∼25 kbar the blue shift ceases and a reversal of shift is observed. The red shift continues up to ∼90 kbar at which point the luminescence is quenched. The shift reversal is interpreted as a pressure-induced direct–indirect transition in porous silicon. The results are best explained in the context of the quantum confinement model. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.110546 |