采用溶胶-凝胶法制备Cu x Zn1-x O薄膜,用X射线衍射仪、原子力显微镜、紫外-可见分光光度计和荧光光谱仪研究薄膜的微结构、表面形貌、透射谱和光致发光谱,结果表明:薄膜均呈六角纤锌矿结构,随着Cu含量增加,薄膜平均晶粒尺寸先增大后减...采用溶胶-凝胶法制备Cu x Zn1-x O薄膜,用X射线衍射仪、原子力显微镜、紫外-可见分光光度计和荧光光谱仪研究薄膜的微结构、表面形貌、透射谱和光致发光谱,结果表明:薄膜均呈六角纤锌矿结构,随着Cu含量增加,薄膜平均晶粒尺寸先增大后减小,表面RMS粗糙度先减小后增大,紫外吸收边发生蓝移,薄膜在可见光波段范围内的平均透过率在80%左右。未掺杂ZnO薄膜中出现一个相对较弱紫光发射带和一个很强的绿光发射带,其它薄膜中出现一个紫光发射和一个蓝光发射带;紫光发射归因于导带以下的局域能级与价带之间的电子跃迁,绿光发射来自于氧空位缺陷能级与价带之间的电子跃迁。展开更多
利用直流反应磁控溅射的方法和后退火技术在石英衬底上制备不同Cd含量的Zn_（1-x）Cd_xO（0≤x≤1）薄膜.利用XRD、XPS、TEM、Absorption及Hall等详细地对薄膜的结构、光学及电学性能进行了研究.研究发现：当x=0~0.2时,Zn_（1-x）Cd_xO...利用直流反应磁控溅射的方法和后退火技术在石英衬底上制备不同Cd含量的Zn_（1-x）Cd_xO（0≤x≤1）薄膜.利用XRD、XPS、TEM、Absorption及Hall等详细地对薄膜的结构、光学及电学性能进行了研究.研究发现：当x=0~0.2时,Zn_（1-x）Cd_xO薄膜为沿（002）方向择优生长的六角相结构;当x=0.5时,合金薄膜出现了六角相和立方相共存现象;当x≥0.8时,合金薄膜为沿（200）方向择优生长的立方相结构.结构为六角相时,合金薄膜的带隙从x=0时的3.25 e V减小到x=0.2时的2.75 e V;结构为立方相时,薄膜的带隙从x=0.8时的2.52 e V减小到x=1时的2.42 e V,带隙的变化很小.另外,霍尔测量结果表明,Cd含量对Zn_（1-x）Cd_xO薄膜的电学性质影响很大.展开更多
Semiconductor(Zn\-\%x\%Cd 1-x S) doped silica glasses were prepared by Sol_Gel process and \%in situ\% growth technique. The structure of the materials was characterized by X_ray diffraction technique, the particle si...Semiconductor(Zn\-\%x\%Cd 1-x S) doped silica glasses were prepared by Sol_Gel process and \%in situ\% growth technique. The structure of the materials was characterized by X_ray diffraction technique, the particle size of semiconductor crystallites from X_ray patterns was estimated less than 10 nm. From absorption spectra, it is obtained that the absorption edges shifted to short wavelength diraction when Zn contents increased, and the absorption edge can be adjusted from 2.46 eV to 2.96 eV by controlling Zn contents. The third_order nonlinear optical susceptibility was studied at 532 nm with 8 ns pulse laser by degenerate four wave mixing (DFWM) technique.展开更多
The magnetic properties of （Cox Fe1-x）A （Zn1-x Fe1＋x）B O4 are studied using mean-field theory and the probability distribution law to obtain the saturation magnetization, the coercive field, the critical temperat...The magnetic properties of （Cox Fe1-x）A （Zn1-x Fe1＋x）B O4 are studied using mean-field theory and the probability distribution law to obtain the saturation magnetization, the coercive field, the critical temperature, and the exchange interactions with different values of D （nm） and x. High-temperature series expansions （HTSEs） combined with the Pade approximant are used to calculate the critical temperature of （CoxFe1-x）A（Znl-xFe1＋x）BO4, and the critical exponent associated with magnetic susceptibility is obtained.展开更多
文摘采用溶胶-凝胶法制备Cu x Zn1-x O薄膜,用X射线衍射仪、原子力显微镜、紫外-可见分光光度计和荧光光谱仪研究薄膜的微结构、表面形貌、透射谱和光致发光谱,结果表明:薄膜均呈六角纤锌矿结构,随着Cu含量增加,薄膜平均晶粒尺寸先增大后减小,表面RMS粗糙度先减小后增大,紫外吸收边发生蓝移,薄膜在可见光波段范围内的平均透过率在80%左右。未掺杂ZnO薄膜中出现一个相对较弱紫光发射带和一个很强的绿光发射带,其它薄膜中出现一个紫光发射和一个蓝光发射带;紫光发射归因于导带以下的局域能级与价带之间的电子跃迁,绿光发射来自于氧空位缺陷能级与价带之间的电子跃迁。
文摘利用直流反应磁控溅射的方法和后退火技术在石英衬底上制备不同Cd含量的Zn_（1-x）Cd_xO（0≤x≤1）薄膜.利用XRD、XPS、TEM、Absorption及Hall等详细地对薄膜的结构、光学及电学性能进行了研究.研究发现：当x=0~0.2时,Zn_（1-x）Cd_xO薄膜为沿（002）方向择优生长的六角相结构;当x=0.5时,合金薄膜出现了六角相和立方相共存现象;当x≥0.8时,合金薄膜为沿（200）方向择优生长的立方相结构.结构为六角相时,合金薄膜的带隙从x=0时的3.25 e V减小到x=0.2时的2.75 e V;结构为立方相时,薄膜的带隙从x=0.8时的2.52 e V减小到x=1时的2.42 e V,带隙的变化很小.另外,霍尔测量结果表明,Cd含量对Zn_（1-x）Cd_xO薄膜的电学性质影响很大.
文摘Semiconductor(Zn\-\%x\%Cd 1-x S) doped silica glasses were prepared by Sol_Gel process and \%in situ\% growth technique. The structure of the materials was characterized by X_ray diffraction technique, the particle size of semiconductor crystallites from X_ray patterns was estimated less than 10 nm. From absorption spectra, it is obtained that the absorption edges shifted to short wavelength diraction when Zn contents increased, and the absorption edge can be adjusted from 2.46 eV to 2.96 eV by controlling Zn contents. The third_order nonlinear optical susceptibility was studied at 532 nm with 8 ns pulse laser by degenerate four wave mixing (DFWM) technique.
文摘The magnetic properties of （Cox Fe1-x）A （Zn1-x Fe1＋x）B O4 are studied using mean-field theory and the probability distribution law to obtain the saturation magnetization, the coercive field, the critical temperature, and the exchange interactions with different values of D （nm） and x. High-temperature series expansions （HTSEs） combined with the Pade approximant are used to calculate the critical temperature of （CoxFe1-x）A（Znl-xFe1＋x）BO4, and the critical exponent associated with magnetic susceptibility is obtained.
