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The photoacoustic spectra from ptype αporous silicon carbides prepared under UV photoassisted process and under darkcurrent condition have been measured,the original silicon carbides were also measured. Combined with RosencwaigGersho theory, the photoaconstic spectra are turned into the absorption spectra. It is found that the energy band gaps of the porous silicon carbide were lower than that of the original silicon carbide, and the causes were analyzed in detail. The absorptions near the absorption edge were studied as well.
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Keywords:
- photoacoustic spectra /
- porous silicon carbide /
- energy band gap
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