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发光多孔硅微结构及其发光起源探讨 总被引:1,自引:0,他引:1
用制备发光多孔硅样品的常规电化学方法,在未抛光多晶硅表面,成功地制备出了均匀地发射肉眼可分辨的可见光样品。样品的先致发光光谱得到了测定,证明是一种典型的多孔硅光致发光光谱。用扫描电镜对样品的表面形貌、截面结构进行了详细的分析,摄制出了发光多孔硅样品的完整多孔状微结构清晰照片。实验结果认为多孔硅样品可分成三层:表面层、多孔层、单晶硅衬底;而多晶硅表面上制备的发光样品只有两层结构:表面层、多晶硅衬底。文中认为多孔硅可见光发射应来自其表面层,而与层下的多孔层微结构无关。 相似文献
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薛舫时 《固体电子学研究与进展》1995,15(3):228-238
锗硅超晶格和多孔硅的大量实验分析表明,其发光性能既不能用间接带隙来解释,也不同于直接光跃迁。本文通过波函数的谐波分析和表面化学键诱生的能带混合研究得出这两种材料中都可能产生出直接带隙分波,从而得到直接光跃迁。运用这种分波发光模型,解释了锗硅超晶格和多孔硅的大量实验结果。最后比较了这两种材料能带工程中的物理效应和化学效应,提出了综合此两效应优化设计新发光材料的新方法。 相似文献
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对两种不同条件下制备的多孔硅进行了红外透射光谱测量,并对超临界干燥和自然干燥条件下的光致发光光谱进行了对比测量。用高分辨率透射电镜对其结构进行了观察,研究表明多孔硅的发光机理与其制备条件有关。 相似文献
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为了实现硅基光电子集成,在多孔硅衬底上制备有机发光器件是一种很有优势的方法.采用匀胶机涂布法在多孔硅中嵌入了新型共轭有机聚合物聚(9,9-二辛基)-2,7-芴-co-N-(4-(2-苯基喹喔啉)苯)-4,4'-二苯胺(PFTQ),对比研究了多孔硅,PFTQ/多孔硅,PFTQ/硅以及PFTQ在甲苯溶液中的光致发光特性.实验结果表明:PFTQ/多孔硅复合膜光致发光强度是PFTQ/硅的2倍,而且相比在甲苯溶液中的PFTQ和PFTQ/硅,发光峰值有所红移,分析认为这是由于共轭聚合物在固态时有效共轭程度增加所致,并且与多孔硅中的激发载流子转移到聚合物分子上形成复合发光有关. 相似文献
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Solar cell grade crystalline silicon with very low reflectivity has been obtained by electrochemically selective erosion.The porous silicon(PS) structure with a mixture of nano-and micro-crystals shows good antireflection properties on the surface layer, which has potential for application in commercial silicon photovoltaic devices after optimization.The morphology and reflectivity of the PS layers are easily modulated by controlling the electrochemical formation conditions(i.e., the current density and the anodization time).It has been shown that much a lower reflectivity of approximately 1.42% in the range 380-1100 nm is realized by using optimized conditions.In addition, the minority carrier lifetime of the PS after removing the phosphorus silicon layer is measured to be ~3.19 μs.These values are very close to the reflectivity and the minority carrier lifetime of Si3N4 as a passivation layer on a bulk silicon-based solar cell(0.33% and 3.03 μs, respectively). 相似文献
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Porous silicon samples are prepared by pulse electrochemical-etching and DC electrochemical-etching. The effects of different preparation methods on luminescent characterization of porous silicon are investigated. Compared with DC electrochemical-etching, pulse electrochemical-etching produces the porous silicon characterized by a more even surface, a stronger luminescence and a PL blue shift to a certain degree. 相似文献
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Kazuo Imai 《Solid-state electronics》1981,24(2):159-164
A new dielectric isolation technology is proposed. In the new structure, single crystalline Si islands are separated from the silicon substrate by oxidized porous silicon. It is based on the following characteristics of the porous silicon oxide formation: (1) p-type Si is more easily changed to porous silicon than n-type Si; (2) porous silicon is formed along the anodic reaction current flow line; (3) the change in volume of porous silicon after oxidation is relatively small; (4) thick porous silicon films (10 μm) can be obtained easily. In this method, a p-type isolated layer is obtained by proton implantation used for an n-type layer formation. Lateral p-n junctions fabricated in such isolated silicon layers show lower leakage current than those reported in SOS technology. 相似文献
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