Nanoporous Si layers have been investigated by photoacoustic (PA) spectroscopy. The optical absorption spectra for porous Si on p-type Si substrates were obtained in the region of 300 to 1500 nm. The absorptivity became remarkable at 600 nm and increased drastically up to the saturation value while the wavelength decreased from 500 to 300 nm. On the basis of the comparison of photoacoustic spectra registered for different light modulation frequencies the value of thermal conductivity of porous Si was estimated to be 1.55 x 10(-3) W/(cm K). [References: 20]
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机译：纳米多孔硅层已通过光声（PA）光谱进行了研究。在300-1500nm的范围内获得了p型Si衬底上的多孔Si的光吸收光谱。吸收率在600 nm处变得很明显，并且急剧增加，直到达到饱和值，而波长从500 nm减小到300 nm。根据对不同光调制频率记录的光声光谱的比较，多孔硅的热导率值估计为1.55 x 10（-3）W /（cm K）。 [参考：20]
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