1998
DOI: 10.1063/1.368670
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Abstract: We investigated photoluminescence (PL) and photoacoustic spectra of several porous silicon samples and proposed a relaxation process for excited carriers in luminescent and nonluminescent porous silicon. The carriers, generated by the exciting light, relax through a nonradiative process and then recombine resulting in light emission in the energy range from 1.7 to 2.2 eV. From the fact that PL peak energy depends linearly on the excitation energy, light emission occurs through radiative centers such as surface… Show more

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Cited by 10 publications
(3 citation statements)
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“…Such specific oxygen related defects remained to be distributed in pSi after anodization and could be responsible for quenching of pSi PL (compare [9]). Significant suppression of dislocation related luminescence in the substrates subjected to HP-HT treatment at 1100±1400 K has been confirmed by us [10].…”
Section: Resultsmentioning
confidence: 99%
“…Such specific oxygen related defects remained to be distributed in pSi after anodization and could be responsible for quenching of pSi PL (compare [9]). Significant suppression of dislocation related luminescence in the substrates subjected to HP-HT treatment at 1100±1400 K has been confirmed by us [10].…”
Section: Resultsmentioning
confidence: 99%
“…These excitons recombine radiatively to yield photoluminescence. At room temperature, the quantum efficiency of radiative recombination drops due to the dominance of phonon-mediated nonradiative processes [4][5][6] and downfall of the number density of excitons resulting from thermal escape of the charge carriers from the quantum dot. 7 However, intentional doping with the rare earth impurity introduces the trap centers inside the nanocrystal about which a significant overlap of the electron and the hole wavefunctions can be realized.…”
Section: Introductionmentioning
confidence: 99%
“…The strong photoluminescence is fascinating because silicon is an indirect transition semiconductor and so light emission had not been thought to occur to such an extent. The emission from porous silicon is usually observed in the red or infrared region [24] [25]. The blue photoluminescence has been also reported from porous silicon, but it derives from silicon oxide formed on the surface of porous silicon.…”
Section: Introductionmentioning
confidence: 99%