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VOLUME 55 (1992) | ISSUE 11 | PAGE 631
Fine structure of the red photoluminescence band of porous silicon
A fine structure of the red photoluminescence band of porous silicon is reported. This is a direct evidence that the visible radiation originates in Si quantum wires wherein two-dimensional quantum confinement of carriers results in a widening of the Si band gap. To explain the line structure a model of electronic energy states in the Si wires is proposed.