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Si非平面衬底上SiGe/Si量子阱的光致发光特性
Strong Photoluminescence From Si1-xGex/Si Quantum Wells on Non-Planar Si Substrate
【摘要】 采用一种晶向性腐蚀方法,在(100)Si平面衬底上腐蚀得到一种非平面结构,经SiGeMBE外延后,从SEM照片上可以看出,SiGe外延层是一种量子点、线和阱的混合结构.非平面结构上的SiGe层的发光强度为平面结构上的8~10倍.从SiGe层内发出的发光强度占样品总发光强度的96%,且m≈1.1的值表明外延层的质量及时载流子的收集效率是高的.随着激发功率的增加,可以看到PL谱的蓝移.
【Abstract】 Non-planar structure was prepared on (100) Si substrate by using an-isotropicetching solution. After growth of SiGe layer in SS-MBE system, cross-section structureshown by SEM pictures tells that the epi-layer consists of dots, wires and well structure.The PL intensity from non-planar structure of SiGe is 8~10 times as large as that fromplanar ones,The emission of more than 96% from SiGe layer and m=1.1 mean that thequality and carrier collection efficiency of SiGe layer are both high. Blue shift is seen in PLspectra as the excitation power increases.
- 【文献出处】 半导体学报 ,CHINESE JOURNAL OF SEMICONDUCTORS , 编辑部邮箱 ,1997年01期
- 【分类号】TN304
- 【被引频次】1
- 【下载频次】36