溶液法制程对有机薄膜晶体管性能影响的研究

基于新型的聚合物绝缘材料和半导体材料,采用溶液法旋涂工艺制作有机薄膜晶体管,通过优化聚合物半导体材料的溶剂、旋涂速度、退火温度等条件,提高有机薄膜晶体管的器件性能。结果表明,不同溶剂溶解半导体对制成的有机薄膜晶体管的迁移率影响明显;半导体层旋涂速度过慢和退火温度过低都会降低有机薄膜晶体管的性能。当采用1,2,4-三氯苯(TCB)作为半导体溶剂,旋涂速度为3 000r/min,后烘温度为190℃时,有机薄膜晶体管的迁移率可以达到约0.5cm2·V-1·s-1,亚阈值摆幅降至约0.6V/dec,开关比大于106。     

基于有机硅栅绝缘层的制备工艺对OTFT性能的影响

基于聚合物绝缘材料和半导体材料,采用溶液法旋涂工艺制作了有机薄膜晶体管(OTFT),通过尝试不同旋涂速度、表面预处理、退火温度等条件来优化聚合物绝缘材料的制备工艺参数,获得了良好的绝缘性的聚合物绝缘材料和器件特性。结果表明,绝缘层旋涂速度过快、表面用氧等离子体处理时间过长和退火温度过低都会降低有机栅极绝缘层(OGI)的绝缘性和OTFT的器件特性。采用硅氧烷材料作为聚合物栅极绝缘层,其溶液由硅氧烷单体和溶剂加丙二醇甲醚醋酸酯(PGMEA)混合而成。OGI的旋涂速度为1 200r/min,退火温度为140℃,在旋涂有机半导体材料之前,需在退火之后的硅氧烷表面进行短暂的氧离子灰化反应。得到的有机薄膜晶体管迁移率约为0.4cm2·V-1·s-1,亚阈值摆幅降至约1.2V/dec,开关比大于104,并且当外加电场为1MV/cm时,漏电流密度低于1.4×10-6 A/cm2(Vds=-40V)。     

聚合物薄膜晶体管制备条件对其性能影响分析

基于溶液法制备稠合噻吩-吡咯并吡咯二酮聚合物薄膜晶体管,比较不同制备环境下的薄膜晶体管的转移特征曲线。结果表明,旋涂环境对聚合物薄膜晶体管的影响可以忽略,但是退火环境对聚合物薄膜晶体管的影响至关重要,从饱和迁移率角度来看,在惰性环境下退火的器件的饱和迁移率是在空气中退火的器件的两倍多。无论退火温度是100°C低温情况还是190°C高温情况,上述结论均适用。这一结果表明退火环境对器件的影响至关重要。     

聚合物薄膜晶体管的制备及性能

以硅材料衬底作栅电极,在衬底上依次制备二氧化硅栅介质层、聚合物MEH-PPV薄膜半导体层和金源、漏电极,成功地得到了聚合物薄膜晶体管.器件的制备和测试都是在空气环境中完成.该薄膜晶体管呈现出较好的场效应晶体管饱和特性,器件的载流子迁移率为5.0×10-5 cm2/(V·s),开关电流比大于2×103.通过在氮气氛下对聚合物薄膜进行退火处理以及聚合物薄膜沉膜前对二氧化硅表面修饰可以适当地提高器件的载流子迁移率.     

C8 BTBT薄膜结晶形貌及OTFT器件性能研究

以p型共轭有机小分子2,7二辛基[1]苯并噻吩并[3,2‐b]苯并噻吩(C8‐BTBT)作为底栅顶接触有机薄膜晶体管(OTFT)的有源层,采用浸渍提拉法、喷墨打印法和真空蒸镀法三种制备工艺,探究半导体薄膜载流子迁移率与结晶形貌的关系,发现不同工艺下有机小分子呈现出不同的生长行为和结晶情况,在很大程度上决定了OTFT器件性能的优劣;此外,通过XRD分析研究了退火处理对C8‐BTBT结晶的影响。结果表明,真空蒸镀制备的薄膜具有更高的结晶度、衬底覆盖率高,并且呈现出SK(Stranski‐Krastanov)模式的结晶生长特征,相应器件中陷阱密度最低,迁移率高达5.44 cm^2·V^-1·s^-1,开关比超过106;且退火处理会严重破坏C8‐BTBT薄膜的结晶。因此,控制半导体层的生长行为,提升半导体层的覆盖率和结晶度是制备高性能共轭小分子OTFT器件的有效途径。     

低LUMO/HOMO共轭聚合物的制备及其电子传输性能

为了探究聚合物结构与性能的关系,获得电子传输型半导体材料。采用Stille交叉偶联反应,制备了基于噻吩-氰基乙烯-噻吩(TCNT)和2-氧吲哚-3-亚基-二氢吡咯吲哚-二酮(BDID)结构的一种新型的低能带隙给体-受体共轭聚合物PBDID-TCNT。采用热重分析仪、示差扫描量热仪、紫外-可见-近红外分光光度计、电化学工作站与原子力显微镜等测试手段对聚合物的热性能、光学性能、电化学性能以及微观结构进行了表征。结果表明:聚合物PBDID-TCNT具有优异的热稳定性,宽的吸收光谱,低的最低未占轨道/最高占有轨道能级(LUMO/HOMO)。首次制得了PBDID-TCNT型的聚合物,以聚合物为半导体层的有机薄膜晶体管器件展现出电子传输特性,电子迁移率达到0.11cm~2/(V·s),同时开关比超过10~5。     

面向有机薄膜晶体管的紫外/红外光退火的溶液法氧化锆薄膜性能研究

首先引入新型油酸配位剂,解决已有溶液法成膜较差的问题,接着引入紫外/红外双光源退火工艺,制备了氧化锆薄膜。与传统的热退火工艺相比,双光源退火能够在较低温度下实现锆盐的分解、还原、氧化,形成高质量氧化锆薄膜。采用紫外分光光度计、原子力显微镜和X射线光电子能谱仪等对制备的氧化锆薄膜进行了表征对比,进而分析了成膜的物理机理。结果表明:所用方法成功实现了低温条件下(<120℃)高质量氧化锆薄膜的制备,薄膜的光学带隙约为5.66 e V,相对介电常数约为22.6,漏电流密度小于10-9 A/cm2@4 MV/cm,表面粗糙度为0.28 nm。最后,基于该氧化锆薄膜绝缘层制备出了低驱动电压的稠合噻吩-吡咯并吡咯二酮聚合物薄膜晶体管,其迁移率为0.50 cm2/(V·s),阈值电压为-0.47 V,电流开关比3.6×107,亚阈值摆幅为0.16 V/dec。     

浸渍提拉法制备有机介质层铝铟锌氧薄膜晶体管

利用溶液法的浸渍提拉工艺制备了以有机聚甲基丙烯酸甲酯(PMMA)为介质层、非晶铝铟锌氧化物(a-AIZO)为沟道层的顶栅共面结构薄膜晶体管(TFT),研究了沟道层退火温度对TFT性能的影响机理。结果表明:较低退火温度(如300和350℃)下处理的沟道层中存在未彻底分解的金属氢氧化物,其以缺陷态形式存在于TFT沟道层内或沟道层/介质层界面处,对导电沟道中电子进行捕获或散射,劣化TFT的迁移率、电流开关比以及亚阈值摆幅。综合来看,退火温度高于400℃下制备的a-AIZO适用于TFT器件的沟道层,相应的器件呈现出较高的迁移率(大于20cm2/(V·s))、较低的亚阈值摆幅(小于0.5V/decade)以及高于104的电流开关比。     

喷墨打印PVP绝缘层柔性薄膜晶体管研究

柔性电子设备的快速发展对薄膜晶体管(TFT)提出了低功耗、耐弯折和可低温制备的要求。其中,栅极绝缘层是核心材料之一。溶液法制备有机栅极绝缘层具有低成本、柔韧性强的优点,适合大面积加工。本文采用喷墨打印法实现了聚乙烯吡咯烷酮(PVP)墨水的印刷成膜,采用XPS分析了不同退火温度处理的印刷PVP薄膜成分差异,并测试了PVP器件的漏电流、电容和转移特性参数。200℃退火的PVP薄膜漏电流密度≤10~(-4) A/cm~2(5V),相对介电常数约为3.8,玻璃衬底器件饱和迁移率达到4.6cm~2/(V·s),开关比≥10~5;PI柔性衬底器件在20mm弯折半径下迁移率2.8cm~2/(V·s),开关比约6×10~4,在柔性电子领域有一定的应用前景。     

有机介质层铟锌氧化物薄膜晶体管

利用直流磁控溅射方法在玻璃基板上室温制备非晶铟锌氧化物半导体薄膜,薄膜表面平整。采用旋涂法室温制备聚四乙烯苯酚有机介质层。以铟锌氧化物薄膜作为沟道层、聚四乙烯苯酚作为介质层,成功制备了顶栅结构的薄膜晶体管。测试结果表明,所制备的薄膜晶体管具有饱和特性且为耗尽工作模式,薄膜晶体管的阈值电压为3.8V,迁移率为25.4cm2.V-1.s-1,开关比为106。     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks     

Call for Papers—Feature Topic,Vol.12,No.7,2015

正Information Centric Networking Information-Centric Networking(ICN) is an emerging direction in Future Internet architecture research,gaining significant tractions among academia and industry.Aiming to replace the conventional host-to-host communication model by a data-centric model,ICN treats data content as the first     

JOURNAL OF ELECTRONICS(CHINA)

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NEXT GENERATION WIRELESS NETWORKS–ESPECIALLY THE USE OF MILLI-MICROWAVE BANDS

The global bandwidth shortage of wireless communications has motivated the exploration of the naillimeter wave （ram-wave） frequency spectrum for the next generation wireless communications. Recent advances in RF CMOS technology and high speed baseband signal processing technologies have enabled tile extensive research and development of turn-wave wireless communications. The multi gigabit per second data rate of ram-wave system will lead to applications in many important scenarios, such as WPAN, WLAN,back-haul for cellular system. And the frequency bands include 28 GHz, 38 GHz, 45GHz, 60GHz, E-BAND and even beyond 100 GHz. The propagation and the imitation of the RF circuits design in these frequency bands make the directional antennas be inevitable for mm-wave communications.