查询词典 excitons

The characteristics of pentacene/perylene derivatives based organic solar cells are investigated in this thesis Donor and acceptor layers are pentacene and N N'-dioctyl-3 4 9 10-perylenetetracarboxylic diimide (PTCDI-2~13C) respectively Twelve organic solar cells with pentacene/PTCDI-2~13C heterojunctions were fabricated to study the influence of various alkylic perylene derivatives on the power conversion efficiency Under the sunlight simulator with AM1 5G filter and 100 mW/cm2 the solar cell of pentacene/PTCDI-7C heterojunction with cathode of Ag/Al bilayer has the best performance among the devices with pentacene/PTCDI-2~13C heterojunctions In PL spectrum analyses the pentacene/PTCDI-7C film had lower recombination rate than the other pentacene/PTCDI-2~13C films; therefore more excitons could reach the P/N junction and enhance short-circuit current Furthermore the PTCDI-7C film grown on the surface of penatcene was more matched than other PTCDI films analyzed by the PL peak shifts of 10 nm and 45 nm thick PTCDI-2~13C and images of atomic force microscope More lattice match between the films of pentacene and PTCDI resulted in fewer defects in P/N junction and more carries can reach electrodes Accordingly the power conversion efficiency approach 2% was obtained from the solar cell with the active layer of pentacene/PTCDI-7C

本研究探讨以五环素/骈苯衍生物异质接面太阳能电池之特性，利用pentacene作为电子施体有机材料，PTCDI -2C~13C作为电子受体有机材料，制作出异质接面为pentacene/ PTCDI-2C ~13C等12种有机太阳能电池，比较不同碳数的骈苯衍生物对於有机太阳能电池之光电转换效率之影响。在AM1 5G、100 mW/cm2的模拟太阳光下，以pentacene/PTCDI-7C异质接面太阳能电池具有短路电流9 882 mA/cm2、开路电压0 376 V、填充因数0 523及光电转换效率达1 945%，皆比其他pentacene/PTCDI-2C ~13C异质接面太阳能电池来的大。由薄膜分析可知PTCDI-7C在这12种太阳能电池中具有较低的电子电洞复合发光效率，可以让较多激子到达异质接面进行电荷分离，减少电子电洞对复合发光的机率；此外，由光激发萤光光谱之峰值位移配合原子力显微镜表面结构图，可以得知当PTCDI-7C成长在pentacene上时会顺著pentacene的结构成长薄膜，故较无缺陷产生在P/N接面处；而在其他结构下则无此现象产生，致使在pentacene/PTCDI-7C薄膜中的载子有较大的机会可以移动至电极，使光电流提高，进而使光电转换效率提高。

We also studied the resonant Raman-scattering in the ZnCdSe/ZnSe QWs with different well width, and found the Raman signal can be only observed in the QWs with width comparable to the Bohr radius of the excitons in the ZnCdSe QWs, which implies the strong correlation between the electrophonon interaction and the quantum confinement effect.

通过采用不同宽度的量子阱，我们研究了ZnCdSe/ZnSe单量子阱的共振喇曼散射特性，发现共振喇曼散射信号只在阱宽与激子玻尔半径相当的单量子阱中（5nm和2.5nm）才能观察到。

That is because the limitation effects of quantum well structure on the electrons and holes, and this structure could improve the composite probability of excitons in the light-emitting layer, thereby increasing brightness and efficiency of OLED.

实验结果表明适当周期数的量子阱结构器件的亮度和电流效率比传统的三层结构器件的要大，主要原因是量子阱结构对电子和空穴的限制作用，这种限制作用提高了电子和空穴在发光层中形成激子和复合的几率，从而提高了发光的亮度和效率。

The effective mass approximation model can very well describe the behaviors of the excitons confined in the dots.

有效质量近似模型可以很好地描述激子的基态能量的量子尺寸效应。

The phase-spacefilling of excitons was used to explain x(3)value enhanced by the excited state.

实验 证实了这一特征。快过程响应时间为PS量级，保持着基态／）的快速时间响应的特点。

The properties of strong-coupling excitons in semiconductor quantum dots are investigated using the linear combination operator and unitary transformation methods.

研究了抛物型半导体量子点中强耦合激子的性质。

We study the dynamics of entanglement and mixedness of the excitons in a system of the two driven quantum dots coupled to a single-model cavity field by means of the concurrence and the linear entropy.

向少华 ，郑青云借助于共生纠缠度和线性熵，研究了两个受驱动的量子点与单模腔场系统中激子纠缠度和混合度的演化动力学行为。

The results show that the fluorescence of excitons has the feature of super-radiance in evidence.

研究表明，激子辐射具有明显的超辐射特征。

According to the analysis, we can relate the polarized spectrum feature to the spin structure of excitons and dot geometry.

根据这个分析，我们可以把极化光光谱连结到激子的自旋结构与量子点的几何形状。

We also study another interesting nonlinear optical effect which iscalled optical Stark effect of excitons in quasi-one-dimensionalsemiconductor quantum wires.

我们还研究了另一个有趣的非线性光学效应，即所谓的光学斯塔克效应。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了