Spectroscopic identification of the luminescence mechanism of highly porous silicon
1993; Elsevier BV; Volume: 57; Issue: 1-6 Linguagem: Inglês
10.1016/0022-2313(93)90144-c
ISSN1872-7883
AutoresP. D. J. Calcott, K. J. Nash, Leigh Canham, Michael J. Kane, D. Brumhead,
Tópico(s)Semiconductor materials and devices
ResumoWe report a detailed spectroscopic study of highly porous silicon. Foremost amongst our results is the observation of momentum-conserving phonon satellites in resonantly excited photoluminescence (PL) spectra. Analysis of these satellites enables the luminescent material in porous silicon to be unambiguously identified as crystalline silicon. This result confirms the quantum confinement model of porous silicon. We also present measurements of the resonantly excited PL close to the laser line, and of the temperature dependence of the luminescence lifetime, and show that these data are naturally explained by the large exchange splitting of highly quantum-confined excitons in crystalline silicon.
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