共查询到19条相似文献,搜索用时 93 毫秒
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太阳能电池用多晶硅铸造技术研究进展 总被引:2,自引:0,他引:2
高性价比优势使多晶硅成为光伏市场的主要材料.随着太阳能电池向低成本化方向的发展,太阳能电池用多晶硅铸造技术的研究与开发有着重要的意义.综述了目前太阳能电池用多晶硅锭、多晶硅带和多晶硅薄膜的铸造技术的起源、原理、优点和缺点,以及采用不同铸造方法制备的硅组织特点,评述了新的太阳能电池用多晶硅的铸造方法,展望了新的铸造太阳能级多晶硅新技术. 相似文献
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产能过剩已经成为了制约我国多晶硅产业和稀土产业健康发展的一个重要因素,针对这两个行业的问题国家出台了多项政策措施给予治理,目前已初见成效。 相似文献
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随着太阳能光伏产业在全球范围内的迅猛发展,作为太阳能电池最基础的原材料一高纯多晶硅,在全球范围内严重短缺,迫切需要发展一种高效率低成本的太阳能级多晶硅的制备方法。在各种生产多晶硅的方法中,定向凝固多晶硅因其成本低、环境污染小,工艺相对简单、成熟,且能直接使用冶金级硅为原料的特点,被寄予很大的希望来实现大规模太阳能级硅的生产。本文综合评述近年来太阳能级多晶硅定向凝固技术的研究进展,着重阐述冶金级硅中磷和硼的提纯,以及多晶硅定向凝固组织和缺陷的控制,并提出今后的研究发展方向。 相似文献
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从去年下半年开始,我国曾经一度辉煌的多晶硅行业进入了一个严酷的“冬季”。不堪亏损重负的中国多晶硅企业纷纷减产停产。近日,商务部对美韩两国多晶硅产品分别发起反倾销、反补贴调查,我国即将遭受没顶之灾的多晶硅企业又生出了一丝希望。 相似文献
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L.Wang H.Shen YF.Hu 《金属学报(英文版)》2005,18(3):269-274
An isotropic etching technique of texturing silicon solar cells has been applied to polycrystalline silicon wafers with different acid concentrations. Optimal etching conditions have been determined by etching rate calculation, scanning electron microscope (SEM) image and reflectance measurement. The surface morphology of the textured wafers varies in accordance with the different etchant concentration which in turn leads to the dissimilarity of etching speed. Textured polycrystalline silicon wafer surfaces display randomly located etched pits which can reduce the surface reflection and enhance the light absorption. The special relationship between reflectivity and etching rate was studied. Reflectance measurements show that isotropic texturing is one of the suitable techniques for texturing polycrys talline silicon wafers and benefits solar cells performances. 相似文献
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概述了非晶硅薄膜的金属诱导晶化原理,介绍了Al,Ni两种金属诱导非晶硅薄膜晶化的一般规律,详细探讨了金属诱导条件下非晶硅薄膜的本质晶化机理,旨在为非晶硅薄膜的低温成核、晶化机理研究和多晶硅薄膜的研发制备提供实验支持与理论参考. 相似文献
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R. Sanjinés M.D. AbadCr. Vâju R. SmajdaM. Mioni? A. Magrez 《Surface & coatings technology》2011,206(4):727-733
The allotropic forms of carbon (amorphous and polycrystalline graphite, carbon black, fullerenes, nanotubes, graphene) exhibit a large variety of charge transport properties which have been stimulating fundamental and applied research for the development of new devices based on micro and nano-sized electronic systems. Carbon based nanocomposites offer the possibility to improve the device performances and to develop novel multifunctional material systems by combining the properties of each individual phase. In this paper we review the electrical properties of carbon materials and some of the most exciting carbon based nanocomposites, as well as their potential technological applications. First, the electrical properties of amorphous and polycrystalline graphitic materials and those of their related nanocomposites materials are discussed. Second, an overview of the state-of-art on research and applications of carbon nanotube-based composites is presented. Third, we discuss briefly the emerging area of research related to graphene materials. Finally, the electrical properties and applications of conducting carbon black aggregates and carbon black/polymer composites are overviewed. 相似文献
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Wear of a new type of diamond composite 总被引:1,自引:0,他引:1
P. Larsson N. Axn T. Ekstrm Sergei Gordeev S. Hogmark 《International Journal of Refractory Metals and Hard Materials》1999,17(6):453-460
The erosion and abrasion resistances of a new type of composite consisting of diamond particles embedded in a silicon carbide matrix have been evaluated. The investigation is a comparative study in which a conventional cemented carbide, a commercially available polycrystalline diamond material and some common engineering ceramics are included as reference materials. The materials are characterised in terms of wear rates and scanning electron microscopy images of the worn surfaces.
It was found that the new diamond–silicon carbide composites were comparable to the commercial diamond composite, and out-competed the other reference materials in erosive and abrasive wear. The results are discussed in terms of the microstructural characteristics of the composites. 相似文献