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采用NaClO和IPA体系对单晶硅各向异性腐蚀制备绒面。通过紫外可见光光度计和扫描电镜对硅绒面的反射率、形貌进行了表征。结果表明,当NaClO为10%（质量分数,下同）, IPA为5%,腐蚀温度为80℃,腐蚀时间为15 min时,能够得到均匀单晶硅绒面,硅片平均反射率达15%左右;与传统的NaOH/IPA腐蚀体系相比,该工艺制得的单晶硅绒面结构反射率低,有利于太阳能电池性能的提高。 相似文献
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王立 《咸阳师范学院学报》2005,20(6):16-17
采用光学方法,测量了硅基镀铜膜的应力随厚度及温度变化关系。实验结果表明与弹性理论一致,屈服强度与膜厚的倒数近似成正比,且应力与温度相关。 相似文献
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用两种电阻率的Si片在不同阳极化反应条件下制得4片多孔硅样品．利用SPEXFL－111型荧光光谱仪测出样品在紫外光激发下的发射光谱,得到多孔硅的蓝紫光发射．根据实验结果,提出衬底的电阻率对光致发光（PL）光谱峰位有决定作用． 相似文献
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王光伟 《天津工程师范学院学报》2006,16(1):14-17
综述了世界及我国太阳能电池产业的发展。指出提升现有多晶薄膜型太阳能电池的光电转换效率并降低其成本是当前光伏电能领域的主要课题。为了同单晶硅太阳能电池竞争，薄膜型光电池必须在性能方面与之相当，成本应该更低。要获得更低的成本，最好的出路是探索更高性能的电池材料和新颖的电池结构。文章阐明用多晶锗硅薄膜作为太阳能电池材料，能获得比多晶硅薄膜太阳能电池更高的发电效率和更低的成本。 相似文献
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设计了一种工作在0～8 GHz频段的热驱动式RF MEMS开关.开关利用热驱动方式实现横向金属直接接触,因此具有较好的射频性能.开关的结构层由厚的电镀镍和氮化硅组成,由于氮化硅的绝缘作用,实现了射频信号与驱动信号的隔离,有助于进一步提高射频性能.分析了在较小变形量的情况下,突起角度与顶点位移量的关系.电镀的金壁作为接触金属降低了接触电阻.开关通过Metal-MUMPs工艺进行成功流片,测试结果显示,开关在8 GHz有小于0.9 dB的插入损耗和大于30 dB的隔离度. 相似文献
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为研究6061-T4铝合金方管压弯构件平面内稳定力学性能,建立ANSYS有限元模型,分析初始缺陷幅值和单元划分精度对数值计算稳定承载力的影响,并通过现有试验数据对ANSYS有限元模型加以验证。在此基础上,进一步分析构件长细比和荷载偏心率对构件稳定承载力的影响。将《铝合金结构设计规范》GB50429-2007压弯构件面内稳定计算公式得到的相关曲线与数值计算的相关曲线进行比较,发现规范公式偏保守较多。基于大量参数分析,建议对于强硬化铝合金,GB50429相关公式中修正系数η1改取0.8,将文中建议结果和数值计算结果进行比较,较原公式吻合更好。 相似文献
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太阳能利用的关键是太阳能的捕获与转换,太阳能转换形式有多种,但最基本的是通过光敏材料将太阳能转化为电能和化学能．本文从硅基半导体太阳能电池材料到当前染料敏化半导体太阳能电池材料,综述了太阳能电池材料的研究进展． 相似文献
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小提琴的运行对音乐表现的效果影响极大。本文对触弦点、弓弦角度、弓毛接触面、弓速变化、弓压作了较为详细的论述。另外，对运弓过程中，右手臂、右手指的协调运作及运行的感觉也作了论述。 相似文献
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In the current studies a miniature silicon wafer fuel cell （FC） using L-ascorbic acid as fuel was developed. The cell employs L-ascorbic acid and air as reactants and a thin polymer electrolyte as a separator. Inductively coupled plasma （ICP） silicon etching was employed to fabricate high aspect-ratio columns on the silicon substrate to increase the surface area. A thin platinum layer deposited directly on the silicon surface by the sputtering was used as the catalyst layer for L-ascorbic acid electro-oxidation. Cyclic voltammetry shows that the oxidation of L-ascorbic acid on the sputtered platinum layer is irreversible and that the onset potentials for the oxidation of L-ascorbic acid are from 0.27 V to 0.35 V versus an Ag/AgCl reference electrode. It is found that at the room temperature, with 1 mol/L L-ascorbic acid/PBS （phosphate buffered solution） solution pumped to the anode at 1 ml/min flow rate and air spontaneously diffusing to the cathode as the oxidant, the maximum output power density of the cell was 1.95 mW/cm^2 at a current density of 10 mA/cm^2. 相似文献
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Ravi Mosurkal 《Resonance》2001,6(10):76-86
The dream of generating electricity from sunlight in large scale at low cost may not be that far from reality in this century.
Rapidly emerging solar energy technology using low cost dye sensitized photovoltaic cells on plastics would be a real boost
for the third world countries. Though the conventional silicon solar cells are efficient in converting solar energy into electricity
until now, the non conventional solar cells based on molecular photosensitization by colored materials in wide band gap semiconductors
is a fast growing field of basic scientific and industrial research. Present state-of-the-art cells using molecular dyes shows
energy conversion efficiencies of 10–11%. In this article, we present the concept of dye-sensitized photovoltaic (DSPV) cell
and the progress in current research. The important contributions of molecular dyes that are used as photosensitizers in these
photovoltaic or solar cells are also described. 相似文献
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为了解决某新型太阳能热水器电控盒上盖因形状复杂带来的装配时发生翘曲变形等缺陷问题,利用有限元分析方法对其成型过程进行数值模拟.建立了太阳能热水器电控盒上盖零件的数学模型,并利用Moldflow软件对其进行流动、保压、冷却过程及翘曲分析,得到该零件注射成型的最佳工艺条件.结果表明:利用数值模拟方法可较大限度地消除产品设计、模具设计及制品成型过程中可能出现的缺陷,从而缩短产品开发周期. 相似文献
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《天津大学学报(英文版)》2015,(5)
The accelerated life test was carried out to investigate the change of spectral transmittance of di-methyl silicon oil and the effects on the electrical performance of silicon solar cell. The di-methyl silicon oil samples before and after accelerated life test were analyzed by FT-IR, GC-MS and LC-MS. The ring compounds and linear compounds with larger molecular weight were detected. The spectral transmittance of di-methyl silicon oil decreased because the chromophore and auxochrome of the products made a sunlight receive decrease on the surface of the solar cell, and resulted in the reduction of cell performance. According to the decrease of spectral transmittance of di-methyl silicon oil, two recovery methods were proposed. The results showed that extraction was superior to vacuum distillation in recovering the aged di-methyl silicon oil. 相似文献
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太阳能电池是当今世界发展最迅速,最有潜力的新兴能源之一,为缓解能源危机提供了一种切实可行的方法。本文首先介绍了目前国际上研究较多的几种太阳能电池,然后分析并总结了不同薄膜太阳能电池在制造成本、生产工艺、转换效率、耐用性、产品厚度等方面的优缺点及发展趋势。可以预见,随着新技术、新结构的不断创新,太阳电池的成本、转换效率和稳定性将不断提高。 相似文献
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简要介绍了薄膜、单晶硅和多晶硅太阳能电池板的优缺点以及实现最大功率点跟踪的几种方法。结合温州地区的太阳辐射情况,利用扰动观察法测量了大量的数据,以比功率为衡量标准对三种太阳能电池板的实际发电能力进行了比较。结果表明,不管是在光强很强还是在光强较弱的环境下,单晶硅太阳能电池板的发电能力均最高;对另两种太阳能板,在光强较强时,薄膜太阳能电池板占优势,在光强很弱时,多晶硅太阳能电池板发电能力更强。 相似文献
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Sheela K. Ramasesha 《Resonance》2013,18(5):440-457
The global warming issues were discussed in Part 1 of this series of articles. This part describes the different solar energy technologies that are available for generating electricity to meet our daily power requirement. The article focuses on different kinds of materials that can be used to make the photovoltaic cells. The most common photovoltaic cells are made with monocrystalline or polycrystalline silicon. The next generation photovoltaic cells are thin film based. The high efficiency multijunction and concentrated solar cell technologies are also introduced in this article. The concept of power generation using solar thermal energy is explained. In the Indian scenario, there are about 250–300 sunny days in most parts of the country. A brief summary of the solar sector achievements in the country is given. 相似文献
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本文介绍目前晶体硅太阳电池制造工艺,通过实验给出各个工艺流程的工艺参数及可调节范围,说明各环节对太阳电池的贡献及注意问题。提出了通过优化各工艺流程来提高晶体硅太阳电池效率的一些方法。 相似文献
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INTRODUCTION The Lanzhou Xiaoxihu Yellow River Bridge is one of few partially cable-stayed bridges. It is con-sidered a partially cable-stayed bridge because beams are under both axial loads and flexure loads. The cables are arranged in semi-fan configuration in a single plane so that they can be easily anchored to the tower. The cable-stayed portion is a 136 m center span with two 81.2 m side spans. The width of box girder’s top flange is 27.5 m, and the bottom flange’s width is 15.… 相似文献