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With HfO 2  filled into the microcavities of the porous single-crystal silicon, the blue photoluminescence was greatly enhanced at room temperature. On one hand, HfO 2  contributes to the light emission with the transitions of the defect levels for oxygen vacancy. On the other hand, the special filling-into-microcavities structure of HfO 2  leads to the presence of ferroelectricity, which greatly enhances the blue emission from porous silicon. Since both HfO 2  and Si are highly compatible with Si-based electronic industry, combined the low-cost and convenient process, the HfO 2 -filled porous Si shows a promising application prospect.

RETRACTED ARTICLE: Enhancement of the blue photoluminescence intensity for the porous silicon with HfO2 filling into microcavities