【摘要】 报道了用UV光照射和不用UV光照射条件下形成的p型α PSC以及原始SiC的光声光谱 (PAS) .从光声Rosenwaig Gersho理论出发 ,计算出多孔SiC的吸收系数与能量的关系 ,得到多孔SiC的能隙低于原始SiC的能隙 ,并深入分析了能隙的变化原因 ,同时 ,对吸收边附近的吸收情况进行了讨论更多还原

【Abstract】 The photoacoustic spectra from p-type α-porous silicon carbides prepared under UV photo-assisted process and under dark-current condition have been measured,the original silicon carbides were also measured. Combined with Rosencwaig-Gersho 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.更多还原