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对多孔硅进行“胺液浸泡 +快速热氧化”处理 ,光致发光谱显示 ,经处理样品的发光峰值波长短到 5 0 0nm ,而且在干燥空气中存放 160d后 ,发光强度变化很小。红外吸收谱表明 ,处理后的多孔硅的主要成分是硅和氧 ,胺液没有在发蓝绿光的样品中留下残迹 ,电子自旋共振谱表明 ,这种蓝绿光样品有相当低的悬挂键密度。这些结果揭示 ,量子限制效应和表面态在多孔硅蓝绿光发射中起着关键性的作用。这种制备发蓝绿光样品的方法简单易行 ,成功率可达 70 %。
The results of photoluminescence showed that the luminescence peak wavelength of the treated sample was as short as 500 nm, and the luminescence intensity changed little after stored in dry air for 160 days. Infrared absorption spectra showed that the main components of the treated porous silicon were silicon and oxygen, the amine solution did not leave a residue in the blue-green-emitting sample, and the electron spin resonance spectrum showed that the blue-green sample was relatively low Dangling bond density. These results reveal that the quantum confinement effect and surface state play a key role in the blue-green-light emission of porous silicon. This method of preparing blue-green samples is straightforward with a success rate of up to 70%.