A combined approach to fabricating Si nanocrystals with high photoluminescence intensity

A combined approach to fabricating Si nanocrystals with high photoluminescence intensity
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一种制备高光致发光强度硅纳米晶体的组合方法

DOI:
10.1016/j.apsusc.2008.10.052
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发表时间:
2009
影响因子:
6.7
通讯作者:
--
中科院分区:
材料科学1区
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--
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这项工作表明,通过结合三种方法与不同的机制,以提高嵌入在SiO2(或Si-nc:SiO2),一个有前途的材料,用于开发硅光源的硅纳米晶体的光致发光(PL)强度,可以实现一个非常高的PL强度。通过在Si(100)衬底上交替蒸发SiO和SiO2,然后在1100°C下热退火,制备了30层Si-nc:SiO2/SiO2样品。这种多层样品具有相当高的PL效率为14%,由Greenham的方法测量,这是44倍,对于相同量的过量Si含量的单层的。在此基础上,对多层样品进行CeF 3掺杂和氢钝化处理,在相同过量Si含量下,样品的荧光强度是单层样品的167倍。
This work demonstrates that by combining three methods with different mechanisms to enhance the photoluminescence (PL) intensity of Si nanocrystals embedded in SiO2(or Si-nc:SiO2), a promising material for developing Si light sources, a very high PL intensity can be achieved. A 30-layered sample of Si-nc:SiO2/SiO2was prepared by alternatively evaporating SiO and SiO2onto a Si(100) substrate followed by thermal annealing at 1100°C. This multilayered sample possessed a fairly high PL efficiency of 14% as measured by Greenham's method, which was 44 times that of a single-layered one for the same amount of excess Si content. Based on this multilayered sample, treatments of CeF3doping and hydrogen passivation were subsequently applied, and a high PL intensity which was 167 times that of a single-layered one for the same amount of excess Si content was achieved.
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