基于AAO纳米光栅的薄膜硅太阳能电池表面减反结构设计与仿真

提出了一种新型的表面带有阳极氧化铝(AAO)纳米光栅的薄膜硅太阳能电池表面减反结构.理论分析设计了AAO纳米光栅结构参数.用Tracepro光学软件研究了不同占空比和光栅常数对薄膜硅光吸收的影响,得到了最佳结构参数.在此基础上,运用FDTD软件进一步模拟了带有最佳AAO结构尺寸的太阳能电池吸收谱线.仿真结果表明在光栅常数为440 nm,光栅高度为75 nm,占空比为0.5结构尺寸下,AAO具有最强的加强光吸收的作用.     

Ag纳米蛾膜结构阵列对薄膜硅太阳能电池光吸收的影响

设计了一种带有Ag纳米蛾膜结构阵列的薄膜硅太阳能电池背反射器.采用时域有限差分(FDTD)法,系统仿真研究了Ag纳米蛾膜阵列的底部直径、高度、阵列周期常数对薄膜硅太阳能电池光吸收的影响.仿真结果表明,Ag纳米蛾膜结构最佳结构参数为:d=60 nm,a=120 nm,h =100 nm.吸收光谱表明带有Ag纳米蛾膜结构的薄膜硅太阳能电池可有效增加700～ 1200 nm波段范围的光,同带有Ag层的薄膜硅太阳能电池相比,光吸收平均增强53.8;,这是因为Si/Ag界面产生表面等离子体共振现象所致.     

Nano Ag-enhanced photoelectric conversion efficiency in all-inorganic,hole-transporting-layer-free CsPbIBr2 perovskite solar cells

All-inorganic, hole-transporting-layer-free CsPbIBr₂ perovskite solar cells have great potential for development, but their device performance needs to be further improved. Recently, metal nanostructures have been successfully applied in the field of solar cells to improve their performance. Nano Ag-enhanced power conversion efficiency (PCE) in one CsPbIBr₂ perovskite solar cell utilizing localized surface plasmons of Ag nanoparticles (NPs) on the surface has been researched experimentally and by simulation in this paper. The localized surface plasmon resonance of Ag NPs has a near-field enhancement effect, which is expected to improve the light absorption of CsPbIBr₂ perovskite photovoltaic devices. In addition, Ag NPs have a forward-scattering effect on the incident light, which can also improve the performance of CsPbIBr₂-based perovskite photovoltaic devices. By directly assembling Ag NPs (with a size of about 150 nm) on the surface of fluorine-doped tin oxide it is found when the particle surface coverage is 10%, the CsPbIBr₂ perovskite photovoltaic device achieves a best PCE of 2.7%, which is 9.76% higher than that of the control group. Without changing any existing structure in the ready-made solar cell, this facile and efficient method has huge applications. To the best of our knowledge, this paper is the first report on nano Ag-enhanced photoelectric conversion efficiency in this kind of CsPbIBr₂ perovskite solar cell.     

基于阳极氧化铝纳米光栅的薄膜硅太阳能电池双重陷光结构设计与仿真

本文提出了表面和底部均带有阳极氧化铝(AAO)纳米光栅的薄膜硅太阳能电池双重陷光结构,利用FDTD软件仿真研究了AAO纳米光栅的周期、厚度和占空比对薄膜硅太阳能电池短路电流密度的影响,并对AAO结构参数进行了优化.仿真结果表明,表面AAO最佳结构参数是周期440 nm,厚度75 nm,占空比0.5,底部AAO最佳结构参数是周期380 nm,厚度90 nm,占空比为0.75.双重AAO组合陷光结构可有效增加薄膜硅太阳能电池在280—1100 nm范围内的光吸收,吸收相对增强可以达到74.44%.     

基于AAO纳米光栅的GaAs太阳能电池组合陷光结构设计与仿真

提出了一种新型的表面和底部都带有阳极氧化铝(AAO)纳米光栅的GaAs太阳能电池结构,理论分析了表面和底部陷光作用的原理.利用FDTD Solution软件研究了短路电流密度(Jsc)和AAO几何参数的关系.结果表明,表面AAO和TiO2双减反层能很好的减少反射.背部AAO和Ag背反射可以有效的增大光程,从而减少电池厚度.带有组合陷光结构的电池可以在0°～45°范围内保持较稳定的Jsc数值.与只有减反层的结构相比,在相同Jsc条件下,组合陷光结构可以减少一半GaAs厚度.     

AAO纳米光栅结构参数对薄膜硅太阳能电池光吸收的影响研究

以多孔氧化铝(AAO)为模板设计了一种新型的纳米光栅背反射结构.采用微波工作室(CST MWS)软件对该结构进行仿真,研究AAO模板的孔径大小、孔径深度和占空比对薄膜硅太阳能电池光吸收的影响.仿真结果表明,以AAO为模板制备的新型背反射结构能够有效地延长光的传播路径,增加长波长光子的吸收.当孔径大小为157.2 nm,孔深为78.6 nm,占空比为0.5时,效果最佳.这与理论的计算结果相一致.     

Whispering-gallery mode lasing from polymer microsphere for humidity sensing

Microlasers based on high quality(Q) whispering-gallery mode(WGM) resonance are promising low threshold laser sources for bio-sensing and imaging applications. In this Letter, dye-doped polymer microspheres were fabricated by a controlling emulsion solvent evaporation method. WGM lasing with low threshold and high Q factors was realized in an individual microsphere under femtosecond laser pumping. The slight change of environmental relative humidity(RH) can be monitored by measuring the shift of the lasing modes at the exposure of water molecules, which demonstrates the sensitivity is as high as 6 pm/RH%. The results would offer an insight into employing microlasers as sensors.     

红外光谱和拉曼光谱的联系和区别

文章综述红外光谱和拉曼光谱的基本原理、产生条件,讨论二者之间的联系和区别：（1）红外光谱常用于研究极性基团的非对称振动;拉曼光谱常用于研究非极性基团与骨架的对称振动;（2）拉曼光谱一次可以同时覆盖40-4000cm-1波数的区间,可对有机物及无机物进行分析;（3）拉曼光谱可测水溶液,而红外光谱不适用于水溶液的测定;（4）拉曼光谱中既有红外光谱解析中的定性三要素还有去偏度ρ,通过测定ρ,可以确定分子的对称性.这两者在应用中互补,掌握和运用这两种光谱技术在分子定性、定量、分子结构及表面形态等研究方面具有一定的指导意义.