Optical Characterization of 4H-, 6H- and 15R-SiC Crystals

• 作 者: LI Xiang-Biao SHI Er-Wei CHEN
• 机 构: ShanghaiInstituteofCeramics,GraduateSchooloftheChineseAcademyofSciences
• 出 处: 结构化学
• 发表日期: 2007年10期
• 关键词: 碳化硅 光吸收 光谱 晶体 silicon carbide optical absorption Raman spectra polytypes
• 基金项目: Supported by ＂863＂ Project （2006AA03A146）, Knowledge Innovation Program of the Chinese Academy of Sciences （KGCX2-YW-206） and Natural Science Foundation of Shanghai （06ZR14096）

The optical absorption of 4H-,6H-and 15R-SiC single crystals has been measured at room temperature. The band gaps were calculated,and the reasons for band gap shrinking were discussed. Influence of free carrier concentration was considered. The first-and