Sb2O3 doped ZnO thin film was prepared by RF magnetron sputtering technique.The influence of Sb2O3 on the structure and the optical absorption of ZnO thin film was studied by XPS,XRD apparatuses and UV-Vis spectrophot...Sb2O3 doped ZnO thin film was prepared by RF magnetron sputtering technique.The influence of Sb2O3 on the structure and the optical absorption of ZnO thin film was studied by XPS,XRD apparatuses and UV-Vis spectrophotometer.The results show that doped Sb2O3 has affected atomic and electronic structures,growth modes of crystal grains and optical absorption of ZnO.The element Sb exists in many forms in the film including transpositional atoms and compounds such as Sb2O3,Zn7Sb2O 14 etc.ZnO crystal grains grow in mixing directions.The lattice relaxation and the content of second phases increase when more Sb is doped.The UVA absorption of doped ZnO thin film increases obviously.The ultraviolet absorption peak narrows,absorption intensity increases,the absorption margin becomes steep and moves to shorter wavelength of about 5 nm,and the visible absorption increases in some sort.展开更多
Three thicknesses of TiO2 films, 174, 195, and 229 nm, were deposited onto quartz substrates by sol–gel spin coating method. The as-deposited thin films were characterized by nano-crystallite with different sizes (19...Three thicknesses of TiO2 films, 174, 195, and 229 nm, were deposited onto quartz substrates by sol–gel spin coating method. The as-deposited thin films were characterized by nano-crystallite with different sizes (19–46 nm) and relatively high porous structure. Optical constants were determined and showed the lowest refractive index of 1.66 for the as-prepared films that ever reported till now. Obtained results were discussed through current theoretical ideas.展开更多
The preparation and development of novel optical thin films are of great importance to functional optical and opto-electric components requiring a low refractive index.In this study, a typical metal-organic framework...The preparation and development of novel optical thin films are of great importance to functional optical and opto-electric components requiring a low refractive index.In this study, a typical metal-organic framework（MOF）, MIL-101（Cr）, is selected as the research model. The corresponding MOF nanoparticles are prepared by a hydrothermal method and the optical thin films are successfully prepared by spincoating. The optical properties of the corresponding MOF thin films are controlled by changing the type of functional groups on the benzene ring of the ligand（terephthalic acid） on MOFs.The functional groups are hydrogen atoms（H）,electron donating groups（-NH_2,-OH） and electron withdrawing groups（-NO_2,-（NO_2）_2 or F_4）, respectively. It is found that the effective refractive index（n_（eff）） of MOF thin films decreases along with the increasing voids among MOF nanoparticles. In addition, the extinction coefficient（k） increases with the addition of electron donating groups, and decreases with the addition of electron withdrawing groups. Among the MOFs used in this study, the n_eff of NO_2-MIL-101（Cr） containing electron withdrawing groups is as low as ~1.2, and value of k is particularly low, which suggests its potential application in antireflective devices. In addition, the intrinsic refractive index（n_（dease）） of the dense MOF materials evaluated according to their porosity increases with the number of the functional groups, and the n_（dense） of the two nitro-substituted MOFs is greater than that of the single nitro-substituted one, and the latter is bigger than that of hydroxyl-substituted one, which is close to that of amino-functionalized one. The diversity of ligands in MOFs makes them a promising new generation of optical materials.展开更多
Quaternary chalcogenide Cu2FeSnS4 （CFTS） nanoparticles, as a kind of potential absorber layer material in thin film solar cells （TFSCs）, were successfully synthesized by using a convenient solvothermal method. Alk...Quaternary chalcogenide Cu2FeSnS4 （CFTS） nanoparticles, as a kind of potential absorber layer material in thin film solar cells （TFSCs）, were successfully synthesized by using a convenient solvothermal method. Alkali element K is incorporated into CFTS thin films in order to fiLrther improve the surface morphology and the optical properties of related films. X-ray diffraction （XRD）, Raman spectroscopy and field emission scanning electron microscopy （FESEM） were used to characterize the phase purity, morphology and composition of CFTS particles and thin films. The results show that the particle elemental ratios of Cu/（Fe＋Sn） and Fe/Sn are 1.2 and 0.9, respectively, which are close to the characteristics of stoichiometric CFTS. The band gaps of CFTS films before and after doping K ions are estimated to be 1.44 eV and 1.4 eV with an error of ±0.02 eV.展开更多
文摘Sb2O3 doped ZnO thin film was prepared by RF magnetron sputtering technique.The influence of Sb2O3 on the structure and the optical absorption of ZnO thin film was studied by XPS,XRD apparatuses and UV-Vis spectrophotometer.The results show that doped Sb2O3 has affected atomic and electronic structures,growth modes of crystal grains and optical absorption of ZnO.The element Sb exists in many forms in the film including transpositional atoms and compounds such as Sb2O3,Zn7Sb2O 14 etc.ZnO crystal grains grow in mixing directions.The lattice relaxation and the content of second phases increase when more Sb is doped.The UVA absorption of doped ZnO thin film increases obviously.The ultraviolet absorption peak narrows,absorption intensity increases,the absorption margin becomes steep and moves to shorter wavelength of about 5 nm,and the visible absorption increases in some sort.
文摘Three thicknesses of TiO2 films, 174, 195, and 229 nm, were deposited onto quartz substrates by sol–gel spin coating method. The as-deposited thin films were characterized by nano-crystallite with different sizes (19–46 nm) and relatively high porous structure. Optical constants were determined and showed the lowest refractive index of 1.66 for the as-prepared films that ever reported till now. Obtained results were discussed through current theoretical ideas.
基金financially supported by the National Natural Science Foundation of China (21203247 and 21573285)research project of National University of Defense Technology (ZK16-03-51)
文摘The preparation and development of novel optical thin films are of great importance to functional optical and opto-electric components requiring a low refractive index.In this study, a typical metal-organic framework（MOF）, MIL-101（Cr）, is selected as the research model. The corresponding MOF nanoparticles are prepared by a hydrothermal method and the optical thin films are successfully prepared by spincoating. The optical properties of the corresponding MOF thin films are controlled by changing the type of functional groups on the benzene ring of the ligand（terephthalic acid） on MOFs.The functional groups are hydrogen atoms（H）,electron donating groups（-NH_2,-OH） and electron withdrawing groups（-NO_2,-（NO_2）_2 or F_4）, respectively. It is found that the effective refractive index（n_（eff）） of MOF thin films decreases along with the increasing voids among MOF nanoparticles. In addition, the extinction coefficient（k） increases with the addition of electron donating groups, and decreases with the addition of electron withdrawing groups. Among the MOFs used in this study, the n_eff of NO_2-MIL-101（Cr） containing electron withdrawing groups is as low as ~1.2, and value of k is particularly low, which suggests its potential application in antireflective devices. In addition, the intrinsic refractive index（n_（dease）） of the dense MOF materials evaluated according to their porosity increases with the number of the functional groups, and the n_（dense） of the two nitro-substituted MOFs is greater than that of the single nitro-substituted one, and the latter is bigger than that of hydroxyl-substituted one, which is close to that of amino-functionalized one. The diversity of ligands in MOFs makes them a promising new generation of optical materials.
基金supported by National Natural Science Foundation of China(No.51674026)the Fundamental Research Funds for the Central Universities in 2015(No.FRF-BD-15-004A)
文摘Quaternary chalcogenide Cu2FeSnS4 （CFTS） nanoparticles, as a kind of potential absorber layer material in thin film solar cells （TFSCs）, were successfully synthesized by using a convenient solvothermal method. Alkali element K is incorporated into CFTS thin films in order to fiLrther improve the surface morphology and the optical properties of related films. X-ray diffraction （XRD）, Raman spectroscopy and field emission scanning electron microscopy （FESEM） were used to characterize the phase purity, morphology and composition of CFTS particles and thin films. The results show that the particle elemental ratios of Cu/（Fe＋Sn） and Fe/Sn are 1.2 and 0.9, respectively, which are close to the characteristics of stoichiometric CFTS. The band gaps of CFTS films before and after doping K ions are estimated to be 1.44 eV and 1.4 eV with an error of ±0.02 eV.
