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多孔硅体现了许多新光学性质 ,本文通过温度依赖的发光、傅立叶红外谱、时间分辨红外谱的观察 ,发现了些有规律的信息。众所周知 ,多孔硅在空气中陈化氧化 ,导致内部纳米尺寸减小 ,界面层由氢变为氧。我们发现同时伴随着电子态从本征态向极化子态的变化。前者随尺寸减小能量升高 ,表现为正常的量子限域效应。而后者却随尺寸减小能量降低 ,表现为量子限域极化子效应。温度依赖的发光谱型和强度变化也清楚地反映了尺寸依赖的极化子行为 ,因此我们提出了个基本的物理模型来描述多孔硅中增强的极化子尺寸效应及其光学行为。
Porous silicon embodies many new optical properties. In this paper, some regular information was found through the observation of temperature-dependent luminescence, Fourier transform infrared spectroscopy and time-resolved infrared spectroscopy. It is well known that porous silicon is aged and oxidized in the air, resulting in a decrease of the internal nano-size and the interface layer from hydrogen to oxygen. We find that accompanied by changes in the electronic state from the eigenstate to the polaron state. The former decreases with the size of the energy increase, the performance of the normal quantum confinement effect. The latter, however, decreases in size as the energy is reduced and appears as a quantum confined polaron effect. The temperature-dependent luminescence patterns and intensity variations also clearly reflect size-dependent polaron behavior, so we propose a basic physical model to describe the enhanced polaron size effect and its optical behavior in porous silicon.