金属氧化物半导体场效应管热载流子退化的1/fγ噪声相关性研究

研究了金属氧化物半导体(MOS)器件在高、中、低三种栅压应力下的热载流子退化效应及其1/fγ噪声特性.基于Si/SiO2界面缺陷氧化层陷阱和界面陷阱的形成理论,结合MOS器件1/f噪声产生机制,并用双声子发射模型模拟了栅氧化层缺陷波函数与器件沟道自由载流子波函数及其相互作用产生能级跃迁、交换载流子的具体过程.建立了热载流子效应、材料缺陷与电参量、噪声之间的统一物理模型.还提出了用噪声参数Sfγ表征高、中、低三种栅应力下金属氧化物半导体场效应管抗热载流子损伤能力的方法.根据热载流子对噪声影响的物理机制设计了实验并验证这个模型.实验结果与模型符合良好.     

The BTeV DAQ and Trigger System—Some Throughput,Usability and Fault Tolerance Aspects

As presented at the last CHEP conference,the BTeV triggering and data collection pose a significant challenge in construction and operation,generating 1.5 Terabytes/second of raw data from over 30 million detector channels.We report on facets of the DAQ and trigger farms.We report on the current design of the DAQ,especially its partitioning features to support commissioning of the detector.We are exploring collaborations with computer science groups experienced in fault tolerant and dynamic real-time and embedded systems to develop a system to provide the extreme flexibility and high availability required of the heterogeneous trigger farm(-ten thousand DSPs and commodity processors).We describe directions in the following areas:system modeling and analysis using the Model Integrated Computing approach to assist in the creation of domain-specific modeling,analysis,and program synthesis environments for building complex,large-scale computer-based systems;System Configuration Management to include compileable design specifications for configurable hardware components,schedules,and communication maps. Runtime Environment and Hierarchical Fault Detection/Management-a system-wide infrastructure for rapidly detecting,isolating,filtering,and reporting faults which will be encapsulated in intelligent active entites(agents)to run on DSPs,L2/3 processors,and other supporting processors throughout the system.     

The DZERO Online System Event Path

The Online computing system for the DZERO experiment is used to control monitor,and acquire data from the approximately 1-million channel detector,This paper describes the Online Host system event data path requirements and design.     

The CDF Date Acquisition System for Tevatron Run Ⅱ

The CDF experiment at the Fermilab Tevatron has been significantly upgraded for the collider Run Ⅱ,which started in march 2001 and is scheduled to alst until 2006,Instantaneous luminosities of 10^32cm^-2S^-1 and above are expected.A data acquisition system capable of efficiently recording the data has been one of the most critical elements of the upgrade.Key figures are the abilitity to deal with the short bunch spacing of 132ns.event sizes of the order of 250kB,and permanent logging of 20MB/s ,The design of the system and experience from the first months of data-taking operation are discussed.     

芴-含氮芳杂环共聚物的载流子注入特性

为了改善聚芴的载流子注入特性,采用密度泛函理论B3LYP/6-31G*方法计算比较了芴、芴-联吡啶和芴-菲咯啉低聚物的几何结构、电子结构、最低激发能及重组能等,并外推到相应聚合物.结果发现:联吡啶/菲咯啉含氮芳杂环的缺电子性质能够诱导聚芴的最高占据轨道(HOMO)和最低空轨道(LUMO)能级分别下降0.45/0.47eV和0.32/0.38eV,提高电子注入能力的同时,调控载流子注入平衡;联吡啶单元的引入导致电子和空穴重组能升高(降低聚芴的载流子迁移率),而芴-菲咯啉共聚物显示了与聚芴相似的迁移性能.     

基于液体基质材料的有机电致发光器件的制备及性能分析

利用液体基质材料9-(2-ethylhexyl)carbazole(EHCz)掺杂有机染料分子5,6,11,12-tetraphenyl-nathacene(rubrene)制备了具有液体发光层的有机电致发光器件,其结构为:ITO/PEDOT:PSS/EH Cz:rubrene/Cs2CO3/ITO,PEDOT:PSS...     

半导体氮化铟(InN)的电学性质

本文总结了近年来半导体InN薄膜材料(主要是六方纤锌矿结构的InN及异质结构)的电学性质研究进展,重点内容为InN的载流子浓度和迁移率,造成InN中高电子浓度现象的施主分析、载流子输运特性及表面、界面特性等。同时也涉及了部分立方闪锌矿结构InN的电学特性和InN在器件(主要是高电子迁移率晶体管器件)上的潜在应用。     

用变温霍尔效应估测锑化铟的禁带宽度

通过变温霍尔效应实验获得锑化铟的霍尔系数随温度变化的数据,根据半导体的霍尔系数随温度的变化规律,计算出禁带宽度,并且着重讨论禁带宽度的两种求法,比较了两种方法的计算精度.     

A novel simulation method to evaluate the collection performance of a monolithic active pixel sensor

A novel simulation method is presented in this paper to evaluate the collection performance of monolithic active pixel sensor (MAPS) devices for minimum ionizing particle tracking. A simplified 3D matrix pixel structure is built using the computer aided design software Sentaurus. The virtual device is then divided into hundreds of parts and an independent customized X photon model is involved in each part to simulate the conditions under ⁵⁵Fe radiation. After data processing and analysis, charge collection efficiency, collection time and diffusion conditions can be estimated in detail. In order to verify the reliability of the method, comparisons are made between the simulations and experiments. Although there are some defects, it can be concluded that the proposed idea is a feasible method for the evaluation of the MAPS collection performance.