打造国内第一块全彩色柔性AMOLED显示屏——彭俊彪教授团队占领柔性有机发光显示技术“制高点”

正AMOLED(有源矩阵有机发光二极体)被称为下一代显示技术,具有反应速度较快、对比度更高、视角较广等特点。华南理工大学材料科学与工程学院彭俊彪教授团队围绕柔性AMOLED显示关键技术,在高性能氧化物TFT材料与薄膜制备技术、柔性AMOLED显示集成技术方面取得了重要研究成果,自主开发了高性能稀土掺杂氧化物半导体材料,获得了高迁移率和稳定的TFT阵列背板,实现了TFT阵列背     

低电压并五苯薄膜场效应晶体管

利用全蒸镀法, 以并五苯作为有源层, 聚甲基丙烯酸甲 酯（PMMA）作为绝缘层, 制备了全有机薄膜场效应晶体管（TFT）. 测试结果表明, 器件具有较低的工作电压和较高的场效应迁移率. 对工作机理进行了探讨.     

退火温度对ZnO薄膜晶体管电特性的影响

针对非晶硅和有机薄膜晶体管的低迁移率问题,以高纯Zn为靶材,反应磁控溅射沉积、且在不同温度下退火的ZnO薄膜作为半导体活性层,成功地制备出基于ZnO材料的薄膜晶体管(ZnO-TFT),研究了退火温度对ZnO -TFT电特性的影响.结果表明:ZnO- TFT的载流子迁移率随退火温度的升高而明显增大,700℃退火的样品迁移...     

氧化温度对阳极氧化法制备WO_3薄膜光阳极的影响

采用阳极氧化法,以含0.7%(质量分数)NH4F,浓度为1mol/L的(NH4)2SO4溶液为电解质制备WO3薄膜光阳极.研究发现,氧化温度对其结构、形貌和光电化学性能有着重要影响.光电化学性能评价发现,随着氧化温度的升高,光电流呈先减小后增加的趋势.0℃和15℃下制备的WO3薄膜光阳极的光电流密度较大,分别为2.14和1.97mA/cm2(偏压为1.0V(vs饱和甘汞电极).X射线粉末衍射(XRD)和扫描电子显微镜(SEM)表征结果表明,较低温度下制备的WO3薄膜光阳极具有较高的光吸收面积、较窄的孔边界以及较好的光电化学性能.然而当温度升高至15℃时,尽管WO3薄膜光阳极的光吸收面积不大、孔边界较厚,但此时WO3薄膜光阳极具有较高的结晶度,可有效地促进光生电子和空穴的分离,提高光电化学性能.     

多晶硅薄膜ELC制备方法中控制纵向热流的探索

准分子激光晶化（ELC）制备多晶硅薄膜是当前制造低温多晶硅TFT的主流技术。本文在非晶氮化硅栅绝缘层中特定区域引入气泡区或者微孔区,大幅度减小该区域的热导率,从而在后面的准分子激光退火过程中建立起适合于晶粒超级横向生长的温度梯度,并初步分析了该方案的可行性。     

氧化锌薄膜的电化学交流阻抗法研究

通过电化学交流阻抗技术对不同电流密度、沉积时间、电解液浓度和溶液温度下制备的氧化锌薄膜进行了表征,结果表明不同条件下制备的氧化锌薄膜的结构不尽相同,但基本上都是内层致密、外层疏松的双层结构.     

应用化学溶液沉积法制备薄膜

本文介绍应用化学溶液沉积法制备超导薄膜的方法．原则上应用这种方法可以广泛制备诸如氧化物铁电薄膜、氧化物介质薄膜、半导体薄膜、金属化合物薄膜等各类薄膜，广泛应用于科研和生产中．其方法成本低廉、工艺简单、制备周期短、且可在较低温度下成相，是一种制备薄膜的好方法．这里从理论与实践的结合上给以论述．     

低功耗氧化铪基柔性透明阻变存储器制备及其性能研究

利用微电子加工工艺在柔性PET衬底上制备透明氧化铪基阻变存储器.采用氧化铪/氧化锌双介质层将存储器转变电流降低至μA量级,从而实现柔性透明存储器的低功耗(μW量级).研究表明,双介质层阻变存储器不仅具有稳定、可重复的阻变存储特性,还具有一定抗弯折性能和较高的热稳定性.进一步研究表明,由于氧化铪/氧化锌界面势垒的存在,抑制了介质中电荷的输运,从而达到器件低电流工作的效果.     

电化学方法制备Ba_(1-x-y)Sr_xCa_yWO_4晶态薄膜的相关机制分析

基于本组采用恒电流技术、直接在金属钨片上以电化学方法制备具有白钨矿结构的钡、锶、钙(包括其复合体系)钨酸盐(Ba1-x-ySrxCayWO4)薄膜的实验研究,分析了利用电化学方法制备功能薄膜中的成膜机制,讨论了晶态薄膜电化学制备过程中的电流密度、电解液酸度、沉积温度和溶液浓度等工艺条件对薄膜形成的影响.该研究结果对利用电化学方法制备相关薄膜也具有重要参考价值.     

OTS修饰的酞菁锌薄膜晶体管

制备并提纯了酞菁锌(ZnPc)有机场效应晶体管,该薄膜器件以具有大π键的ZnPc作为载流子传输有源层,以自制的热生长SiO2膜层作为晶体管的栅绝缘层,经长链两亲分子十八烷基三氯硅烷(OTS)修饰以后,具有复合双绝缘层的结构.测试结果显示:以此为基础制备的器件具有良好的I-V输出特性,OTS/SiO2复合双绝缘层的器件结构能有效改进有机薄膜晶体管的性能.     

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.     

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).     

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.     

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.