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- W2046586931 abstract "Detailed experimental procedure of an in situ photoelectrical technique applied to porous silicon absorption coefficient measurement is described. In this technique, the underlying silicon substrate is used as a photodetector of the monochromatic light intensity transmitted by the porous layer. In particular, the investigation of spectral range validity of this technique has evidenced that at high photon energy, the porous silicon photoluminescence (PL) is excited and contributes to the photocurrent. It is shown that this PL contribution can be readily separated from that of the directly transmitted light, providing two benefits: first, the high accuracy of the measurement remains unaffected by the PL at high excitation energy, which justifies the application to photon energy as high as 3 eV, and second, the PL component can be further exploited to measure the porous silicon PL quantum efficiency. Typical absorption coefficient spectra obtained by this technique are then recalled. They are discussed in the frame of a model based on the analysis of the absorption coefficient of an ensemble of different quantum-size silicon crystallites." @default.
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- W2046586931 date "2001-01-01" @default.
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- W2046586931 title "<i>In situ</i> measurement of the optical absorption coefficient of porous silicon" @default.
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- W2046586931 doi "https://doi.org/10.1063/1.1328785" @default.
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