周期注入LD开环同步的理论研究

以单周期注入为例,数值模拟并讨论了注入频率和注入光场波动强度对LD同步特性的影响.从功率和相位角度讨论了LD注入锁定的实现,并使用相似指数作为参考标准来评价同步性能.结果表明:注入光场的频率和振幅波动对系统的动态特性和同步性能有显著影响.当注入强度足够大时,系统实现注入锁定;增大调制指数,将抑制同步区域.因此,可以通过增加注入强度或减少注入振幅波动来实现精确同步.研究特定注入强度下主LD调制指数和调制频率相空间的同步品质发现,相似指数的最小值出现在调制频率1～10 GHz间,且随调制指数的增加向低频方向移动.     

1.25Gb/s CMOS高灵敏度宽动态范围跨阻放大器

采用0.35μm CMOS工艺设计并实现了一种新的应用于1.25Gb/s光纤通信接收机的高灵敏度、宽动态范围跨阻放大器电路。引入电流注入技术提高输入管跨导、优化噪声性能、提高灵敏度。自带直流反馈实现直流消除功能,同时采用自动增益控制机制,提高动态范围。仿真结果表明,该电路具有82.02dBΩ的跨阻增益、872.7MHz的带宽、23.74kHz的低频截止频率,输入等效噪声电流为4.08pA/Hz(1/2),最大输入光信号为+3dBm(2mA),在3.3V的电源电压下,芯片功耗为43.4mW。     

How small the contacts could be optimal for nanoscale organic transistors?

We report on a study seeking an optimized contact configuration for organic transistors that minimizes contact effects but maintains smallest contact size. We begin with the bulk access resistance in staggered transistors which results from the charge transport through the organic semiconductor film. Bulk access resistance is an intrinsic contributor to the contact resistance which has been little understood due to lack of a reliable study tool. In this work, we utilize the inner transported power inside the semiconductor film as a medium to investigate the contact resistance and the relevant contact effects. We examine the influences of the organic film thickness (t_SC), the channel length (L), the underlying charge transport and various organic semiconductor materials with variable carrier mobility. A roughly optimal contact length (L_C) of L_C0 ≈ 6t_SC is obtained. The results reveal that besides the device architecture the underlying charge transport should be also taken into account in designing organic transistors for practical application.     

PMOLED发光特性的研究

为了研究PMOLED器件的物理特性。在Alq3主体材料中掺杂C545制备了PMOLED发光器件．其单象素结构为TO（120nm）／CuPc（12nm）／NPB（50nm）／Alq3：C545（30nm）／LiF（1nm）／Al（200nm），色坐标为（0．276，0．589）。该器件的载流予注入模型，在起亮前符合热发射注入模型；起亮后满足遂穿注入模型。PMOLED能较好地满足朗伯定律，并具有响应速度快，视角宽，色彩保真度高等特性。     

多芯电缆屏蔽效能测试方法研究

首先介绍了屏蔽效能的定义,然后根据多芯电缆和同轴电缆的区别与联系,提出了适用于测量多芯屏蔽电缆效能的注入线测试方法,并且比较了测试结果和仿真结果,为测试人员合理选择有效的测试方法提供了依据。     

Test and Analysis for Spraying Ammonia in Diesel Engine

A certain amount of ammonia reducer were directly injected into the 4102BZLQ Diesel engine’s combustion chamber when the combustion temperature decreases to 1573-1073K, NOx generated could be reduced to 1.11g/(kW·h). Based on PRF combustion mechanism, NO was tested by using the heavy-duty diesel engine test cycle of ESC thirteen conditions[1], the ammonia spray angle and amount were tested and optimized in different conditions. The test results show that the thermal efficiency of Diesel engine does not decrease while NO exhaust decreases.     

高压共轨柴油机喷油系统性能仿真研究

对高压共轨喷油系统高压油泵、共轨管、电控喷油器等进行了分析,建立了高压共轨喷油系统数学模型;采用GT-FUEL以燃油流动过程为基本流动模型建立了高压共轨喷油系统仿真模型;对高压共轨喷油系统进行了台架试验,对试验结果进行了分析,并对仿真模型的计算精度进行了验证,误差在8.1%以内.     

Influence of oligothiophene-functionalized co-sensitizer on the electron injection efficiency for multiple dye-TiO2 interface

Co-sensitizer has been employed in dye-sensitized solar cells (DSSCs) to enhance light harvesting at organic/inorganic heterogeneous. Here, the multiple dyes@TiO₂ interface has been investigated by density functional theory simulations, to explore the role of varied oligothiophene-functionalized co-sensitizers on the electron injection efficiency. In presence of co-sensitizers, the simulated absorption spectra broaden with the increasing of the number of thiophene from 0, 1, to 2. Meanwhile, the co-sensitizer modifies the energy alignment of interface, and influences the electronic coupling between dye and TiO₂. Critically, the ratio of electron-hole recombination and electron injection rates k_rec/k_inj based on Marcus theory for both dye and co-sensitizer decrease significantly with increasing of the number of oligothiophene, resulting in the improved electron injection efficiency. Our result implies that the electron injection efficiency depends on the number of thiophene in co-sensitizer largely, and appropriate number plays an active role in tuning the electronic properties of hybrid heterostructure.     

Lithium Phenolate Complexes with a Pyridine‐Containing Polymer for Solution‐Processable Electron Injection Layers in PLEDs

A series of (vinylphenyl)pyridine‐based polymer binders, PVPh2Py, PVPh3Py, and PVPh4Py, are designed and synthesized and it is found that mixtures of Liq and the polymers exhibit superior electron injection characteristics as ultrathin (1.6 nm) electron injection layer (EIL) films. They are comparable to those of EILs composed only of Liq. The addition of the polymers does not deteriorate the performance of Liq EILs. Additionally, when the EIL thickness is increased from 1.6 nm to 16 nm, the driving voltages increase and the external quantum efficiencies decrease. The increase in the voltage and decrease in the EQE are suppressed in the device with mixed EILs compared to those observed for the device composed of 100 wt% Liq. Furthermore, the position of the nitrogen in the pyridine ring is considered to influence the electron transport properties of the EILs. The mixing PVPh4Py with Liq improves the driving voltage of the fabricated devices, even with a thick mixed EIL. This reduced dependence of the performance of EILs on their thickness will be advantageous for the coating of large areas using solution processes.