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Electrodeposition of cerium oxide on porous silicon via anodization and enhancement of photoluminescence

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Abstract

A porous Si/cerium oxide composite (PSi/CeO2) was synthesized by electrodeposition of CeO2 via anodic oxidation on PSi. The PSi photoluminescence (PL) was enhanced. The anodically oxidized PSi substrates in HF solution had macropores (diameter 2 μm), mesopores (diameter 15 nm), and micropores (diameter less than 4 nm). Emission at 700 nm from microporous PSi (microPSi) was observed under ultraviolet irradiation. Transmission electron microscopy showed that in microPSi/CeO2, the oxide was infiltrated into microPSi by anodization. The deposited amount of CeO2 depended on the reaction time, applied voltage, temperature, and reaction species concentrations in anodization. Emission by microPSi/CeO2 at 650 nm was observed; the PL intensity was higher (about 10–30 times) than that of PSi because of energy transfer from CeO2 to nanosized Si in porous layers produced by HF etching. The lifetime of the PL of microPSi/CeO2 was longer than that of microPSi. Excitation spectra of microPSi/CeO2 at 650 nm and diffuse-reflectance spectra showed that the excitation peak for microPSi/CeO2 was similar to the absorbance of CeO2, and excitation of microPSi/CeO2 gave two peaks, at 3.7 and 4.4 eV; these peaks originated from the absorptions of CeO2 and Si nanocrystals. The PL of PSi was enhanced in microPSi/CeO2 because of efficient energy transfer from CeO2 to the Si nanocrystal.

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Acknowledgments

This study is supported by the research project of No. 12101607 in “Phase Interface Science for Highly Efficient Energy Utilization” of JST Core Research for Evolutional Science and Technology (CREST).

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Authors and Affiliations

  1. Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, 657-8501, Japan

    Minoru Mizuhata, Yohei Kubo & Hideshi Maki

  2. Center for Environmental Management, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, 657-8501, Japan

    Hideshi Maki

Authors
  1. Minoru Mizuhata
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  2. Yohei Kubo
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  3. Hideshi Maki
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Correspondence to Minoru Mizuhata.

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Mizuhata, M., Kubo, Y. & Maki, H. Electrodeposition of cerium oxide on porous silicon via anodization and enhancement of photoluminescence. Appl. Phys. A 122, 103 (2016). https://doi.org/10.1007/s00339-015-9562-9

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