Zn_(1-x)Mg_(x)O alloy films are important deep ultraviolet photoelectric materials.In this work,we used plasma-assisted molecular beam epitaxy to prepare Zn_(1-x)Mg_(x)O films with different magnesium contents on pola...Zn_(1-x)Mg_(x)O alloy films are important deep ultraviolet photoelectric materials.In this work,we used plasma-assisted molecular beam epitaxy to prepare Zn_(1-x)Mg_(x)O films with different magnesium contents on polar(0001)and nonpolar(1010)ZnO substrates.The nanoscale structural features of the grown alloy films as well as the interfaces were investigated.It was observed that the cubic phases of the alloy films emerged when the Mg content reached 20%and 37%for the alloy films grown on the(0001)and(1010)ZnO substrates,respectively.High-resolution transmission electron microscopy images revealed cubic phases without visible hexagonal phases for the alloy films with more than 70%magnesium,and the cubic phases exhibited three-fold and two-fold rotations for the alloy films on the polar(0001)and nonpolar(1010)ZnO substrates,respectively.This work aims to provide references for monitoring the Zn_(1-x)Mg_(x)O film structure with respect to different substrate orientations.展开更多
A zinc oxide thin film in cubic crystalline phase, which is usually prepared under high pressure, has been grown on the Mg O（001） substrate by a three-step growth using plasma-assisted molecular beam epitaxy. The cu...A zinc oxide thin film in cubic crystalline phase, which is usually prepared under high pressure, has been grown on the Mg O（001） substrate by a three-step growth using plasma-assisted molecular beam epitaxy. The cubic structure is confirmed by in-situ reflection high energy electron diffraction measurements and simulations. The x-ray photoelectron spectroscopy reveals that the outer-layer surface of the film（less than 5 nm thick） is of ZnO phase while the buffer layer above the substrate is of ZnMgO phase, which is further confirmed by the band edge transmissions at the wavelengths of about 390 nm and 280 nm, respectively. The x-ray diffraction exhibits no peaks related to wurtzite ZnO phase in the film. The cubic ZnO film is presumably considered to be of the rock-salt phase. This work suggests that the metastable cubic ZnO films, which are of applicational interest for p-type doping, can be epitaxially grown on the rock-salt substrates without the usually needed high pressure conditions.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.11804050).
文摘Zn_(1-x)Mg_(x)O alloy films are important deep ultraviolet photoelectric materials.In this work,we used plasma-assisted molecular beam epitaxy to prepare Zn_(1-x)Mg_(x)O films with different magnesium contents on polar(0001)and nonpolar(1010)ZnO substrates.The nanoscale structural features of the grown alloy films as well as the interfaces were investigated.It was observed that the cubic phases of the alloy films emerged when the Mg content reached 20%and 37%for the alloy films grown on the(0001)and(1010)ZnO substrates,respectively.High-resolution transmission electron microscopy images revealed cubic phases without visible hexagonal phases for the alloy films with more than 70%magnesium,and the cubic phases exhibited three-fold and two-fold rotations for the alloy films on the polar(0001)and nonpolar(1010)ZnO substrates,respectively.This work aims to provide references for monitoring the Zn_(1-x)Mg_(x)O film structure with respect to different substrate orientations.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11204253,U1232110,U1332105,61227009,and 91321102)the Fundamental Research Funds for Central Universities,China(Grant No.2013SH001)the National High Technology Research and Development Program of China(Grant No.2014AA052202)
文摘A zinc oxide thin film in cubic crystalline phase, which is usually prepared under high pressure, has been grown on the Mg O（001） substrate by a three-step growth using plasma-assisted molecular beam epitaxy. The cubic structure is confirmed by in-situ reflection high energy electron diffraction measurements and simulations. The x-ray photoelectron spectroscopy reveals that the outer-layer surface of the film（less than 5 nm thick） is of ZnO phase while the buffer layer above the substrate is of ZnMgO phase, which is further confirmed by the band edge transmissions at the wavelengths of about 390 nm and 280 nm, respectively. The x-ray diffraction exhibits no peaks related to wurtzite ZnO phase in the film. The cubic ZnO film is presumably considered to be of the rock-salt phase. This work suggests that the metastable cubic ZnO films, which are of applicational interest for p-type doping, can be epitaxially grown on the rock-salt substrates without the usually needed high pressure conditions.
基金supported by the National Natural Science Fund for Excellent Young Scholars(62022068)the National Key Research and Development Program of China(2018YFB0406603)+3 种基金the National Natural Science Foundation of China(61804129,61974123 and 61874092)the Science and Technology Key Project of Xiamen(3502ZCQ20191001)the Science and Technology Project of Fujian Province,China(2019H0002)the Natural Science Foundation of Jiangxi Province,China(20192BAB217013)。
