硼碳氮薄膜的制备及其光透过性质研究

利用射频磁控溅射方法以不同的氮气分压比（1/10-2/3）在玻璃衬底上制备出一组硼碳氮薄膜.傅里叶变换红外光谱测量发现样品的组成原子之间均实现了原子级化合.氮气分压比对薄膜的组分和透过率有很大影响,其通过改变薄膜组分而影响透过率,并且碳原子数小的样品具有较高的透过率.     

铟锡氧化物导电玻璃上高氮含量氮化碳薄膜的电化学沉积及其性能研究

在铟锡氧化物导电玻璃基底上,采用二氰二胺(C2N 4H4)的乙腈饱和溶液电化学沉积高氮含量的CNx薄膜.X射线光电子能谱(XPS)分析表明,薄膜主要由C,N组成,最高nN/nC=1.22(接近C3N4中氮与碳的化学计量数比1.33).傅里叶变换红外光谱(FTIR)分析表明碳和氮主要以C-N, CN 的形式形成共价键.样品具有较宽的带隙,在50 ℃,1 250 V下得到的薄膜样品的光学能隙为2.32 eV.实验结果表明,电压在1 000～1 300 V、温度在30～50 ℃时能得到氮含量较高的薄膜.     

磁控溅射法制备氮掺杂的氧化锌薄膜

目的 比较氮掺杂的氧化锌薄膜与纯氧化锌薄膜的发光特性.方法 用射频磁控溅射法,在玻璃衬底上通过控制氢气,氧气,氮气的流量,制备了纯氧化锌薄膜和氮掺杂的氧化锌薄膜样品.结果 通过比较纯氧化锌薄膜样品和氮掺杂的氧化锌薄膜样品的发光谱,在466nm(2.6 eV)附近发现了一个发光峰;氮掺杂的氧化锌薄膜样品的带隙比纯氧化锌薄膜样品的带隙宽.结论 氮掺杂的氧化锌薄膜在466 nm左右的发光峰与氮有关;带隙变宽的原因:一个是样品中的晶粒小引起的量子限制效应,另一个是压应力引起的氧化锌晶格中的氧原子的2p轨道和锌原子的4s轨道之间斥力增大.     

射频溅射金属前驱体硫化法制备的Cu_2ZnSnS_4薄膜(英文)

采用射频溅射技术沉积Cu/Sn/Zn金属前驱体叠层结合硫化技术在玻璃衬底上成功制备了Cu2ZnSnS4薄膜。X-射线衍射分析表明,通过优化制备条件可以获得单一黝锡矿结构且具有(221)择优取向的Cu2ZnSnS4薄膜。霍尔效应和紫外可见透过谱测量表明,样品的薄膜电阻、吸收系数和光学带隙分别达到0.073Ω.cm,104cm-1和1.53eV,具有适合作为薄膜太阳电池吸收层应用的可能性。     

不同含量Cd掺杂对Cu_2SnS_3薄膜结构和性能的影响

通过溶液法合成了Cu_2SnS_3(CTS)薄膜,并研究了不同Cd含量对CTS薄膜晶体结构和性能等方面的影响.研究发现通过Cd掺杂可以有效调节CTS的光学带隙(Eg).不添加Cd时,样品为面心立方相的CTS(C-CTS),带隙为0.82 eV.当Cd含量在4.18%~13.38%的范围内时,立方相的CTS逐渐转变为立方结构固溶体(C-CTS:Cd)和四方结构固溶体(T-CTS:Cd).通过改变制备样品的Cd掺杂含量,可实现带隙从0.82~1.26 eV的调节.XPS测试结果表明,CTS(即未掺杂Cd的CTS)样品中,Cu、Sn和S元素的价态分别为+1,+4和-2价.SEM形貌结果显示所有的Cu-Sn-S-Cd(CTSC)合金薄膜都表现出光滑和紧凑的表面形态并没有观察到明显的孔或裂纹.所制备的单一相的C-CTS和T-CTS:Cd薄膜可以作为太阳能电池的吸收层材料.     

无氢类金刚石膜的光致发光特性研究

使用脉冲激光沉积（PLD）技术制备了系列无氢类金刚石（DLC）薄膜,测量了样品的Raman光谱、光吸收和光致发光,研究了光致发光与制备条件的依赖关系。结果表明,这种薄膜是有少量sp^2键和sp^2键组成的非晶碳膜。薄膜的光学带隙在1．68～2.46eV,发光在可见光区呈宽带结构。沉积温度对类金刚石薄膜的结构和发光性质有较大影响。当沉积温度从室温升高至400℃时,sp^2团簇的长大使C原子的有序度增强,从而导致薄膜的光学带隙变窄,发光峰红移且半高宽变小。     

氮化铜薄膜的结构与组成分析

采用反应直流磁控溅射的方法在室温下,在玻璃基底上成功制备了多晶氮化铜(Cu3N)薄膜.XRD显示薄膜是择优生长取向的,在低氮气分压时薄膜择优[111]晶向生长,在高氮气分压条件下薄膜的择优生长取向为[100]、[111];XPS分析表明,在低氮气分压时,薄膜主要由Cu3N和Cu组成;在高氮气分压时,薄膜主要由Cu3N组成,而Cu的含量很少.     

衬底温度对氮化锌薄膜特性的影响

采用直流磁控溅射的方法,在不同温度的玻璃衬底上生长Zn3N2薄膜.研究了衬底温度对样品的微结构、表面形貌以及光学性质的影响.结果表明,随着衬底温度的升高,生长的Zn3N2薄膜择优取向增多;晶粒尺寸逐渐变大;Zn3N2薄膜间接光学带隙由1.86 eV逐渐增大到2.26 eV.     

SiOP介质膜及其对InGaAsP/InP量子阱激光结构混合无序的影响

用等离子体增强化学沉积(PECVD)方法制备了一种新的电介质薄膜—SiOP,用X射线光电子谱(XPS)和光荧光(PL)研究了膜的结构及膜对1.55μmInGaAsP/InP量子阱激光结构带隙的影响.XPS分析表明,该膜中存在SiO和PO键,P(2p)态键能为134.6eV.PL测量首次获得223.6meV的最大带隙蓝移.该技术在光子集成和光电子集成电路(PIC's,OEIC's)中有广泛的应用前景.     

射频功率对硼碳氮薄膜的组分和厚度的影响

利用射频磁控溅射方法以不同的射频功率(80～130 W)在硅衬底上制备出一组硼碳氮(BCN)薄膜.傅里叶红外吸收光谱(FTIR)和X射线光电子能谱(XPS)测量发现样品的组成原子之间均实现了原子级化合.射频功率对薄膜的组分和厚度有很大影响,二者随射频功率的增大而呈规律性变化.B、N元素含量高、C元素含量低的硼碳氮薄膜较厚.并且,射频功率为110 W条件下制备的硼碳氮薄膜中C元素含量最低,薄膜最厚.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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