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- W1966263604 abstract "We report the exposure time dependence of the photoacoustic (PA) intensities of porous silicon (PS) with different excitation wavelengths together with that of the photoluminescence (PL). Although the PA intensity decreases somewhat slowly with exposure time, the PL intensity undergoes significant degradation at a first stage until 50 min. The exposure time dependencies of PA and PL show the combinations of two exponential decays. Fast decay time in the PA intensity decreases with the increase of the excitation wavelength. On the other hand, that in the PL intensity increases with the increase of the excitation wavelength. In the shorter wavelength excitation, the degradation at first stage in PL is faster than that in PA. However, in the larger wavelength excitation, the degradation at first stage in PL is slower than that in PA. Slow decay times in PA and PL increase with the increase of the excitation wavelength. These experimental results suggest that the change of the optical absorption center is different from that of luminescent center. The former is related to the formation of oxides inside PS layers although the latter relates to the surface of PS." @default.
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- W1966263604 date "2003-01-01" @default.
- W1966263604 modified "2023-10-16" @default.
- W1966263604 title "Exposure time dependence of the photoacoustic and photoluminescence intensities of porous silicon with different wavelengths of excitation light" @default.
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- W1966263604 doi "https://doi.org/10.1063/1.1517151" @default.
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