Optical investigation of A-plane ZnO/ZnMgO multiple quantum wells grown by pulsed laser deposition |
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| Authors: | DY Lin TP Huang YC Kao CC Huang HC Kuo Li Chang |
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| Institution: | aDepartment of Electronic Engineering, National Changhua University of Education, Changhua, Taiwan;bDepartment of Photonics and Institute of Electro-Optical Engineering, National Chiao Tung University, Hsinchu, Taiwan;cDepartment of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan |
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| Abstract: | In this study, we present the optical characteristics of A-plane ZnO/ZnMgO multiple quantum wells (MQWs) with different well widths grown on R-plane sapphire substrates by pulsed laser deposition (PLD). The energy gaps of ZnO and ZnMgO have been observed by photoluminescence (PL) and absorption spectra. The electrons confined in the ZnO wells transit from the electron ground sub-band to the heavy-hole ground sub-band (noted as 11H) located at 3.40 and 3.57 eV for the ZnO/ZnMgO MQWs samples with well widths of 5.6 and 1.2 nm, respectively. The strong anisotropic polarization characteristic has been studied by polarization-dependent PL measurements. For comparison, we also calculated the transition energies of different well thicknesses varying from 1 to 6 nm. The theoretical results match quite well with the experimental values and revealing the suitable conduction band offset Qc=0.6. The temperature dependence of PL spectra is being investigated, in the temperature range between 10 and 300 K. |
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