Open AccessPhotoacoustic determination of the energy band characterics for porous silicon carbides
Author(s) -
Yide Li,
Du Ying-Lei,
Lee Ki-Huan,
Wu Bai-Mei
Publication year - 2003
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.52.1260
Subject(s) - silicon carbide , materials science , porous silicon , carbide , silicon , spectral line , absorption (acoustics) , photoacoustic imaging in biomedicine , absorption edge , enhanced data rates for gsm evolution , band gap , optoelectronics , composite material , optics , physics , telecommunications , astronomy , computer science
The photoacoustic spectra from ptype αporous silicon carbides prepared under UV photoassisted process and under darkcurrent condition have been measuredthe 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.