Giant in-plane optical anisotropy of a-plane ZnO on r-plane sapphire  

作　　者：武树杰 陈涌海 秦旭东 高寒松 俞金玲 朱来攀 李远 时凯 

机构地区：[1]Key Laboratory of Semiconductor Materials Science and Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices,Institute of Semiconductors,Chinese Academy of Sciences

出　　处：《Journal of Semiconductors》2013年第12期17-20,共4页半导体学报（英文版）

基　　金：Project supported by the State Key Development Program for Basic Research of China(Nos.2013CB619306,2012CB921304);the National Natural Science Foundation of China(No.60990313);the National High Technology Research and Development Program of China(No.2011AA03A101)

摘　　要：We have measured the in-plane optical anisotropy （IPOA） of （1120） ZnO （a-plane） on （10]-2） sapphire （r-plane） by reflectance difference spectroscopy （RDS） at room temperature. Giant IPOA has been observed be- tween the light polarized direction parallel and perpendicular to the c axis of ZnO, since the symmetry of a-plane is C2v. A sharp resonance has been observed near the fundamental band gap, which is induced by the polarization- depend band gap shift. The sharp line shape is attributed to the exciton transition. The spectra fitting and differential spectra indicate the polarization-depend band energies. The giant IPOA is possible enhanced by anisotropy strain along and perpendicular to the c axis in the a-plane.We have measured the in-plane optical anisotropy （IPOA） of （1120） ZnO （a-plane） on （10]-2） sapphire （r-plane） by reflectance difference spectroscopy （RDS） at room temperature. Giant IPOA has been observed be- tween the light polarized direction parallel and perpendicular to the c axis of ZnO, since the symmetry of a-plane is C2v. A sharp resonance has been observed near the fundamental band gap, which is induced by the polarization- depend band gap shift. The sharp line shape is attributed to the exciton transition. The spectra fitting and differential spectra indicate the polarization-depend band energies. The giant IPOA is possible enhanced by anisotropy strain along and perpendicular to the c axis in the a-plane.

关 键 词：ZNO in-plane optical anisotropy reflectance difference spectroscopy 

分 类 号：TN304[电子电信—物理电子学]