Abstract
The optical properties of multilayered porous-Si formed by using electrochemical anodization with a current pulse modulation method were investigated. The photoluminescence intensity was observed to increase dramatically and to be slightly blue-shifted with increasing the period of the porous multilayer. The improvement in the photoluminescence property for multi-stacked porous-Si layers might be attributed to an enhancement of the overall size-effect resulting from the insertion of an interlayer with a high porosity between sandwiched layers with low porosity because these multi-stacked porous-Si layers might provide many luminescence centers in the vertical direction as well as the lateral direction, From the photoluminescence and optical transmittance results for thermally treated porous-Si multilayers, the luminescence from multilayered porous Si is thought to originate from nanocrystallites structured with Si-H and SiH 2 rather than from interface traps between porous-Si and SiO x.
Original language | English |
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Pages (from-to) | 876-879 |
Number of pages | 4 |
Journal | Journal of the Korean Physical Society |
Volume | 47 |
Issue number | 5 |
State | Published - Nov 2005 |
Keywords
- Current pulse modulation
- Multilayered porous silicon
- Optical property