The absorption edge positions and PL peaks shift towards shorter wavelengths while Raman spectra show broader peaks with decreasing Si layer thickness. The results are mainly attributed to the quantum confinement effects.

• 结果表明 ,随纳米Si层厚度的减小 ,光学吸收边以及光致荧光峰发生明显蓝移 ,Ra man峰发生展宽 ,即观测到明显的量子尺寸效应