衬底温度对铝掺杂氧化锌薄膜生长及其微结构性能的影响

以铝掺杂氧化锌(Zn O:Al)陶瓷靶作为溅射材料,采用RF磁控溅射技术,在玻璃衬底上制备了Zn O:Al半导体薄膜,通过X射线衍射(XRD)测试研究了衬底温度对Zn O:Al薄膜生长特性及其微结构性能的影响.研究表明:衬底温度对薄膜生长和微结构均具有明显的影响;随着衬底温度的升高,薄膜(002)晶面取向度和平均晶粒尺寸表现为先增大后减小的变化趋势,而半高宽、微应变和位错密度则呈现出先减小后增大的变化趋势.当衬底温度为650 K时,Zn O:Al薄膜具有最高的(002)晶面取向度、最大的晶粒尺寸、最窄的半高宽、最低的微应变、最小的位错密度,其结晶性能和微结构性能最佳.     

磁控溅射法制备ZnO:Ga薄膜的结晶质量及其应力研究

以氧化锌(Zn O)掺杂氧化镓(Ga2O3)的陶瓷靶作为溅射靶材,采用射频磁控溅射技术在玻璃衬底上制备了透明导电的掺镓氧化锌(Zn O:Ga)薄膜.通过X射线衍射仪测试研究了衬底温度对薄膜结晶性能及其残余应力的影响.研究结果表明:所有Zn O:Ga薄膜均为六角纤锌矿型的多晶结构并具有(002)方向的择优取向特性,其结晶性能和残余应力与衬底温度密切相关.随着衬底温度的升高,薄膜的(002)择优取向程度和晶粒尺寸呈现出先增大后减小的变化趋势,而薄膜的残余压应力则单调减小.当衬底温度为400℃时,Zn O:Ga薄膜具有最大的晶粒尺寸(75.1 nm)、最大的织构系数TC(002)(2.995)、较小的压应力(-0.185 GPa)和最好的结晶性能.     

氧化锌薄膜的微观结构及其结晶性能研究

以普通玻璃作为衬底材料,采用射频磁控溅射方法制备了氧化锌(ZnO)透明导电薄膜,通过X射线衍射(XRD)和X射线光电子能谱(XPS)测试,研究了衬底温度对薄膜微观结构及其结晶性能的影响.结果表明:所制备的ZnO薄膜均为(002)晶面择优取向生长的多晶薄膜,其微观结构和结晶性能与衬底温度密切相关.衬底温度对ZnO薄膜的织构系数TC(hkl)、平均晶粒尺寸、位错密度、晶格应变和晶格常数都具有不同程度的影响,当衬底温度为800 K时,ZnO薄膜样品的织构系数TC(002)最高(4.929)、平均晶粒尺寸最大(20.91 nm)、位错密度最小(2.289×10~(15)line·m~(-2))、晶格应变最低(2.781×10~(-3)),具有最高的(002)晶面择优取向生长性和最佳的微观结构性能.     

氧化铟锡TCO薄膜的制备及其结晶性能研究

以掺锡氧化铟陶瓷靶材作为溅射源,采用磁控溅射技术在玻璃衬底上制备了氧化铟锡(ITO)透明导电薄膜,通过X-射线衍射仪(XRD)和X-射线光电子能谱仪(XPS)测试表征,研究了生长温度对薄膜结晶性质和微结构性能的影响.结果表明:所沉积的ITO薄膜均具有体心立方的多晶结构,其生长特性和微结构性能明显受到生长温度的影响.生长温度升高时,薄膜(222)晶面的织构系数T_(C(222))和晶粒尺寸先增后减,而晶格应变和位错密度则先减后增.当生长温度为500 K时,ITO样品的织构系数T_(C(222))最高(1.5097)、晶粒尺寸最大(52.8 nm)、晶格应变最低(1.226×10~(-3))、位错密度最小(3.409×10~(14)m~(-2)),具有最佳的(222)晶面择优取向性和微结构性能.     

掺锡In_2O_3薄膜的晶粒生长及其微观结构性质研究

以氧化锡(SnO_2)掺杂的氧化铟(In_2O_3)陶瓷靶作为溅射源材料,利用射频磁控溅射工艺在普通玻璃基底上沉积了掺锡In_2O_3(In_2O_3:Sn)薄膜样品,通过XPS、XRD和SEM等表征手段,研究了基底温度对薄膜晶粒生长和微观结构的影响.结果表明,所有In_2O_3:Sn样品均为多晶薄膜并具有体心立方铁锰矿晶体结构,基底温度对晶粒生长特性和微观结构性能具有明显的影响.基底温度升高时,薄膜沿(222)晶面的织构系数和平均晶粒尺寸先增大后减小,而位错密度和晶格应变则呈现相反的变化趋势.当基底温度为250℃时,In_2O_3:Sn样品沿(222)晶面的织构系数最高、平均晶粒尺寸最大、位错密度最小、晶格应变最低,薄膜具有最佳的(222)晶面择优取向生长特性和微观结构性能.     

铝掺杂氧化锌薄膜的光学性能及其微结构研究

以氧化铝(Al2O3)掺杂的氧化锌(Zn O)陶瓷靶作为溅射靶材,采用射频磁控溅射工艺在玻璃基片上制备了具有c轴择优取向的铝掺杂氧化锌(Zn O:Al)薄膜样品.通过可见-紫外光分光光度计和X射线衍射仪的测试表征,研究了生长温度对薄膜光学性能及其微结构的影响.实验结果表明:薄膜性能和微观结构与生长温度密切相关.随着生长温度的升高,样品的可见光平均透过率、(002)择优取向程度和晶粒尺寸均呈非单调变化,生长温度为640 K的样品具有最好的透光性能和晶体质量.同时薄膜样品的折射率均表现为正常色散特性,其光学能隙随生长温度升高而单调增大.与未掺杂Zn O块材的能隙相比,所有Zn O:Al薄膜样品的直接光学能隙均变宽.     

磁控溅射沉积镓掺杂氧化锌薄膜的微观结构性质研究(英文)

采用磁控溅射工艺在玻璃衬底上沉积镓掺杂氧化物透明导电薄膜样品,通过X-射线衍射仪的测试表征及其定量分析研究了薄膜样品的结晶性质和微观结构性能.结果表明,所沉积的样品均为六角纤锌矿型的多晶结构并具有(002)择优取向生长特性,其晶格常数、晶面间距和Zn-O键长等参数与标准值一致.当膜厚为570 nm时,薄膜样品的(002)织构系数和晶体尺寸最大、晶格应变和位错密度最小,具有最好的晶体质量和微观结构性能.     

厚度对ZnS薄膜结构和应力的影响

用射频磁控溅射法在单晶Si基片上制备了4种不同厚度的ZnS膜,采用XRD和光学干涉相移法对薄膜的微结构和应力进行研究。结构分析表明,不同厚度的ZnS膜均呈多晶状态,并有明显的(220)晶面择优取向,晶体结构为立方晶型(闪锌矿)结构;随着薄膜厚度的增加,平均晶粒尺寸随之增大;薄膜的晶格常数在不同厚度下均比标准值稍大。应力分析表明,随着膜厚的增加,ZnS膜的应力差减小,在厚度为768 nm时的选区范围内应力差最小,应力分布较均匀。     

镁钇合掺氧化锌薄膜的制备及其性能研究

以镁钇掺杂的氧化锌(Zn O)陶瓷靶作为溅射靶材,采用射频磁控溅射技术在玻璃衬底上制备了镁钇合掺Zn O(MYZO)薄膜样品.通过X射线衍射仪和分光光度计的测试表征,研究了薄膜厚度对MYZO样品结构性质和光学性能的影响.结果表明:MYZO样品均为六角纤锌矿型的多晶结构,并且其择优取向生长特性明显受到薄膜厚度的影响,当薄膜厚度为290 nm时,MYZO样品具有(002)择优取向生长特性.另外通过光学表征方法获得了MYZO样品的光学能隙、折射率和消光系数,结果显示:MYZO样品的光学能隙大于未掺杂Zn O能隙,其折射率均表现为正常色散特性,并且遵循Wemple-Di Domenico单振子色散模型.     

沉积温度对氧化锌薄膜结构和光学性能的影响

采用射频磁控溅射方法在玻璃基板上制备了氧化锌(ZnO)薄膜样品,利用X射线衍射(XRD)表征和紫外-可见光透射光谱对其进行了表征,研究了沉积温度对ZnO薄膜结构和光学性能的影响.结果表明:所有ZnO样品都是c轴高度择优取向的多晶薄膜;沉积温度对ZnO样品晶体质量和光学性能都具有明显的影响;随着沉积温度的升高,ZnO薄膜(002)衍射峰的半高宽单调减小,而(002)晶面取向度、平均晶粒尺寸和可见光波段平均透过率则单调增大.当沉积温度为500°C时,ZnO薄膜样品具有最高的(002)晶面取向度(0.987)、最大的平均晶粒尺寸(22.1 nm)和最好的可见光波段平均透过率(82.3%).     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.