Вышедшие номера
The Optical Blueshift Saturation Behavior of MgxZn1-xO Films
National Natural Science Foundation of China, 61774083
National Natural Science Foundation of China, 61306103
Xue C.1, Zhang J.1, Lu X.2, Geng M.2, Huang T.2, Zhang T.1, Gu D.1, Shen L.1, Wang L.1
1Department of Physics, School of Physical and Mathematical Sciences, Nanjing Tech University, Nanjing, China
2School of 2011, Nanjing Tech University, Nanjing, China
Email: wangl055@njtech.edu.cn
Поступила в редакцию: 16 июня 2021 г.
Выставление онлайн: 9 июля 2021 г.

A phenomenon of blueshift saturation was observed from cathodoluminescence (CL) spectra of MgxZn1-xO films (0.069≤ x≤0.8) that were grown by pulsed laser deposition technology. By analyzing the results of composition-dependent X-ray diffraction spectra, scanning electron microscopy images, absorption spectra, and CL spectra, the crystalline structural disorder was determined via Urbach energy value. Furthermore, a competition mechanism between band-filling effect and band tail states was proposed in the composition-dependent CL spectra. This competition is believed to be responsible for the composition-induced blueshift saturation often observed in the disordered alloy semiconductors. The results of this research can provide important reference in energy-band engineering. Keywords: MgxZn1-xO, luminescence, Urbach energy, band tail state.

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