We investigate the magnesium（Mg） incorporation efficiencies in MgxZn1-xO films on c-plane Zn-face ZnO substrates by using metalorganic chemical vapor deposition（MOCVD） technique. In order to deposit high quality M...We investigate the magnesium（Mg） incorporation efficiencies in MgxZn1-xO films on c-plane Zn-face ZnO substrates by using metalorganic chemical vapor deposition（MOCVD） technique. In order to deposit high quality MgxZn1-xO films,atomically smooth epi-ready surfaces of the hydrothermal grown ZnO substrates are achieved by thermal annealing in O2 atmosphere and characterized by atomic force microscope（AFM）. The AFM, scanning electron microscope（SEM）,and x-ray diffraction（XRD） studies demonstrate that the MgxZn1-xO films each have flat surface and hexagonal wurtzite structure without phase segregation at up to Mg content of 34.4%. The effects of the growth parameters including substrate temperature, reactor pressure and Ⅵ/Ⅱ ratio on Mg content in the films are investigated by XRD analysis based on Vegard＇s law, and confirmed by photo-luminescence spectra and x-ray photoelectron spectroscopy as well. It is indicated that high substrate temperature, low reactor pressure, and high Ⅵ/Ⅱratio are good for obtaining high Mg content.展开更多
Bismuth-containing semiconductor material is a hot topic in photocatalysts because of its effective absorption under the visible light. In this paper, we expect to explore a new bismuth-based photocatalyst by studying...Bismuth-containing semiconductor material is a hot topic in photocatalysts because of its effective absorption under the visible light. In this paper, we expect to explore a new bismuth-based photocatalyst by studying the subsolidus phase relations of the Bi2O3-Fe2O3-La2O3 system. The X-ray diffraction data shows that in this ternary system the ternary compound does not exist, while seven binary compounds （including one solid solution series Bi1-xLaxO1.5 with 0.167 〈 x 〈 0.339） are obtained and eight compatibility triangles are determined.展开更多
The subsolidus phase relations of the ternary system Zn O-Mo O3-Bi2O3 have been investigated by X-ray diffraction（XRD） analyses. The phase diagrams have been constructed. There are eight binary compounds and no tern...The subsolidus phase relations of the ternary system Zn O-Mo O3-Bi2O3 have been investigated by X-ray diffraction（XRD） analyses. The phase diagrams have been constructed. There are eight binary compounds and no ternary compound in the Zn O-Mo O3-Bi2O3 system. This system can be divided into nine three-phase regions. From the phase relations of Zn O-MoO 3-Bi2O3 system, the possible component regions for Zn O single crystal flux growth are Zn O-Zn3Mo2O9-Bi2 Mo O6, Zn O-Bi2 Mo O6-Bi26Mo10O69, Zn O-Bi26Mo10O69-Bi14 MoO 24, and Zn O-Bi14 Mo O24-Bi38 Zn O58.展开更多
ZnO single crystal was used as the substrate to study the effect of ZnO crystal plane polarity on the morphology and structure of CH_3NH_3PbI_3（MAPbI_3） perovskite film and carrier transport properties,which is mean...ZnO single crystal was used as the substrate to study the effect of ZnO crystal plane polarity on the morphology and structure of CH_3NH_3PbI_3（MAPbI_3） perovskite film and carrier transport properties,which is meaningful for improving ZnO-based perovskite solar cell. It is found that perovskite thin film has small grain size（about 190 nm） and high coverage rate on the O-face of ZnO single crystal,and the dominant exposed crystal plane of perovskite film is（110） plane. While the MAPbI_3 thin film has large grain size（about 1.03 μm） and low coverage rate on the Zn-face,and the（022） plane is dominantly exposed for the perovskite film. The injection of photogenerated electrons from MAPbI_3 film into the O-face of ZnO single crystal is faster and more effective than that to Zn-face. It is supposed that O-face is more suitable for ZnO single crystal based perovskite cell fabrication than Zn-face.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.61474121)and the Major Scientific Project of Fujian Province,China(Grant No.2014NZ0002-2)
文摘We investigate the magnesium（Mg） incorporation efficiencies in MgxZn1-xO films on c-plane Zn-face ZnO substrates by using metalorganic chemical vapor deposition（MOCVD） technique. In order to deposit high quality MgxZn1-xO films,atomically smooth epi-ready surfaces of the hydrothermal grown ZnO substrates are achieved by thermal annealing in O2 atmosphere and characterized by atomic force microscope（AFM）. The AFM, scanning electron microscope（SEM）,and x-ray diffraction（XRD） studies demonstrate that the MgxZn1-xO films each have flat surface and hexagonal wurtzite structure without phase segregation at up to Mg content of 34.4%. The effects of the growth parameters including substrate temperature, reactor pressure and Ⅵ/Ⅱ ratio on Mg content in the films are investigated by XRD analysis based on Vegard＇s law, and confirmed by photo-luminescence spectra and x-ray photoelectron spectroscopy as well. It is indicated that high substrate temperature, low reactor pressure, and high Ⅵ/Ⅱratio are good for obtaining high Mg content.
基金Project supported by the National Basic Research Program of China (Grant No.2010CB933501)the National Natural Science Foundation (NNSF) of China (Grant Nos.51002153,21007070,51102232,61106004,21103191,21203198,and 61306075)the Science and Technology Project of Fujian Province,China (Grant No.2013H0056)
文摘Bismuth-containing semiconductor material is a hot topic in photocatalysts because of its effective absorption under the visible light. In this paper, we expect to explore a new bismuth-based photocatalyst by studying the subsolidus phase relations of the Bi2O3-Fe2O3-La2O3 system. The X-ray diffraction data shows that in this ternary system the ternary compound does not exist, while seven binary compounds （including one solid solution series Bi1-xLaxO1.5 with 0.167 〈 x 〈 0.339） are obtained and eight compatibility triangles are determined.
基金supported by the National Natural Science Foundation of China(61474121,51302262 and 21203198)the Major Research plan of the National Natural Science Foundation of China(No.91333207)the Natural Science Foundation of Fujian Province(2012J05033)
文摘The subsolidus phase relations of the ternary system Zn O-Mo O3-Bi2O3 have been investigated by X-ray diffraction（XRD） analyses. The phase diagrams have been constructed. There are eight binary compounds and no ternary compound in the Zn O-Mo O3-Bi2O3 system. This system can be divided into nine three-phase regions. From the phase relations of Zn O-MoO 3-Bi2O3 system, the possible component regions for Zn O single crystal flux growth are Zn O-Zn3Mo2O9-Bi2 Mo O6, Zn O-Bi2 Mo O6-Bi26Mo10O69, Zn O-Bi26Mo10O69-Bi14 MoO 24, and Zn O-Bi14 Mo O24-Bi38 Zn O58.
基金supported by the National Natural Science Foundation of China(Nos.91333207,61427901 and U1505252)
文摘ZnO single crystal was used as the substrate to study the effect of ZnO crystal plane polarity on the morphology and structure of CH_3NH_3PbI_3（MAPbI_3） perovskite film and carrier transport properties,which is meaningful for improving ZnO-based perovskite solar cell. It is found that perovskite thin film has small grain size（about 190 nm） and high coverage rate on the O-face of ZnO single crystal,and the dominant exposed crystal plane of perovskite film is（110） plane. While the MAPbI_3 thin film has large grain size（about 1.03 μm） and low coverage rate on the Zn-face,and the（022） plane is dominantly exposed for the perovskite film. The injection of photogenerated electrons from MAPbI_3 film into the O-face of ZnO single crystal is faster and more effective than that to Zn-face. It is supposed that O-face is more suitable for ZnO single crystal based perovskite cell fabrication than Zn-face.
