排序方式: 共有44条查询结果,搜索用时 31 毫秒
31.
The subwavelength structures are designed and fabricated for broadband antireflection application. Under target of zero reflectivity, the parameters of periodic 2-D continuous conical structures are analyzed by the finite-difference time-domain (FDTD) method. The corresponding conical structures are obtained with spatial period of 350 nm and structure height of 300 nm, respectively. The 2-D continuous conical structured surface is fabricated by micro-replication process combining with the originated structure fabrication realized by interference lithography, Ni mold electroplation and replication by using UV imprinting into plastics. The average reflectances of the simulation and replicated polymer prototype are about 0.50% and 0.54% within the spectral ranges of 400-650 nm, respectively. In a word, the subwavelength structured surface with low reflection is developed and proved to be highly consistent with the simulation results. 相似文献
32.
Jinsu Yoo 《Applied Surface Science》2010,257(5):1612-1615
The insufficient supply of polysilicon is limiting the growth of the segment of the photovoltaic industry using silicon materials. Because it is grown directly in the form of ribbon from a silicon melt, edge-defined film-fed growth (EFG) silicon ribbon is a promising alternative for cutting down wafer costs by reducing the polysilicon consumption and eliminating kerf loss. In this paper, we will discuss the various properties that can be achieved with for low cost and high-efficiency EFG silicon ribbon solar cell fabrication. Boron-doped p-type EFG ribbon silicon wafers with resistivities of 2-4 Ω cm and a size of 125 mm × 125 mm were used. The major fabrication steps we studied were mixed acid (HF, HNO3, DI water) texturing, phosphorus diffusion with POCl3, thermal oxide growth for surface passivation, laser process for edge isolation, and PECVD of SiNx:H for surface passivation and antireflection coating. By optimizing the processing steps, we achieved a conversion efficiency, open circuit voltage, short circuit current, and fill factor as high as 14.5%, 584 mV, 32.1 mA/cm2, and 77%, respectively. 相似文献
33.
Antireflection subwavelength structures (ASSs) are analyzed by using the finite difference time domain (FDTD) method in the visible light spectrum. Low reflectance can be obtained by both the conical and pyramidal shapes over a broadband range. Comparing the reflectance of different structure shapes and aspect ratios by the FDTD method, it shows that the antireflection efficiencies of the pyramidal structures are better than that of the conical structures when the aspect ratio is up to 0.8. It is found that, for the conical structure surface, the average transmittance increases gradually with the aspect ratio and the average transmittance is about 99.6% with the aspect ratio of 2.0. However, for the pyramidal structure with the aspect ratio ranging from 1.0 to 2.0, the average transmittance is up to 99.7%. 相似文献
34.
Subwavelength structured surfaces with a broadband antireflection function are analyzed by using a finite difference time domain method. The 2D periodic pure conical and pyramidal structures and several composite structured surfaces composing of conical and pyramidal structures are presented and discussed. It is found that the antireflection function will decrease for the same size of structures when the structure arrangement is discontinuous and the results of the structures with an aspect ratio of 2.0 are obviously better than the 1.0. It is also found that some composite structured surfaces have powerful antireflection function in the spectral ranges of 400-1400 nm within the 800-1200 nm spectral ranges. 相似文献
35.
本文用考虑了增益饱和和热效应的耦合速率方程,对减反射涂层结构1.3μmInGaAsP/InP超辐射发光二极管的输出特性进行了计算,给出了腔长、有源层厚度和后腔面反射率对其输出光功率的影响以及光谱半宽随腔长和注入电流的变化。计算结果与我们制备的该结构超辐射发光二极管测试结果有较好的符合。 相似文献
36.
Herein we demonstrate an improved metal-assisted etching method to achieve highly dense and uniform silicon nanowire arrays. A pre-surface treatment was applied on a silicon wafer before the process of metal-assisted etching in silver nitrate and hydrogen fluoride solution. The treatment made silver ion continuously reduce on silver nuclei adherence on the silicon surface, leading to formation of dense silver nanoparticles. Silver nanoparticles acting as local redox centers cause the formation of dense silicon nanowire arrays. In contrast, an H-terminated silicon surface made silver ion reduce uniformly on the silicon surface to form silver flakes. The silicon nanowires fabricated with a pre-surface treatment reveals higher density than those fabricated without a pre-surface treatment. The volume fraction improves from 18 to 38%. This improvement reduces the solar-weighted reflectance to as low as 3.3% for silicon nanowires with a length of only 0.87 μm. In comparison, the silicon nanowires fabricated without a pre-surface treatment have to be as long as 1.812 μm to achieve the same reflectance. 相似文献
37.
《Photonics and Nanostructures》2014,12(1):16-22
Anti-reflective coatings are widely used on the surfaces of solar cells to increase the efficiency of photoelectric conversion. Sub-wavelength structures have gradually replaced conventional anti-reflective (AR) thin films due to their broadband AR properties. This paper successfully fabricated structures with a variety of surface morphologies on Si substrate using polystyrene sphere lithography in conjunction with two-step inductive coupling plasma (ICP) and high density plasma (HDP) etching processes. We successfully fabricated various sub-micron structures with heights of 700 nm and above. Experimental results show that the sub-micron pyramidal structure has the best anti-reflection performance with the average reflectance effectively suppressed to below 1% across the spectral range of 300–1200 nm. 相似文献
38.
39.
A double-layer anisotropic antireflection coating is designed and fabricated using the technique of serial bideposition. Both layers in the coating are biaxial with nanostructural columns directed normal to the substrate. Incident light with the p polarization encounters a pair of quarter-wave layers with refractive indices that satisfy the standard relationship for zero reflectance at the design wavelength. Light with the s polarization meets non-quarter-wave layers and different indices and hence is partially reflected. As an example to illustrate potential applications of the coating, we have used a thin glass plate with anisotropic antireflection coatings on both sides as an intracavity element to select the direction of polarization of an open-cavity HeNe laser. 相似文献
40.