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Luminescence properties of ZnO-M heterostructures fabricated by galvanic-submerged photosynthesis of crystallites

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Title: Luminescence properties of ZnO-M heterostructures fabricated by galvanic-submerged photosynthesis of crystallites
Authors: Hiraiwa, Kento Browse this author
Takahashi, Yuki Browse this author
Mizuno, Junichi Browse this author
Jeem, Melbert Browse this author
Watanabe, Seiichi Browse this author →KAKEN DB
Keywords: ZnO heterostructures
Submerged photosynthesis
Galvanic replacement
Issue Date: 30-Sep-2019
Publisher: Elsevier
Journal Title: Applied surface science
Volume: 489
Start Page: 269
End Page: 277
Publisher DOI: 10.1016/j.apsusc.2019.05.292
Abstract: By adapting hetero-nanostructures in optoelectronic device, a prominent luminescence characteristic can be obtained. The challenge is to engineer the band bending if a semiconducting surface gets contact with a metal. A galvanic replacement method is versatile for bimetallic hetero-nanostructures synthesis. However, the nanostructures morphologies can be varied depending on the metals pair or their supporting template. In this study, we demonstrate a facile 1-D ZnO nanorods (NRs) growth fabricated by galvanic replacement reactions. Without using bimetallic solution, the galvanic replacement reaction was implemented by joining Zn metal to Au, Pt, Ag, Cu, W, and Ni metals substrate. The luminescence properties of ZnO NRs were characterized by photoluminescence (PL) and cathodoluminescence in scanning transmission electron microscopy (STEM-CL). Based on PL analysis result, oxygen vacancy (V-O) was responsible for the visible light region emission in all ZnO-M samples. Then, STEM-CL analysis highlighted the presence of zinc interstitial (Zn-i) at the interface of ZnO-M. Due to band bending, interaction between V-O and Zn-i resulted the formation of zinc antisite (Zn-O) at the interface. There was no shift in visible light emission of the NRs due to Fermi-level pinning. The findings will be useful for future large-scale synthesis and engineering of hetero-nanostructures luminescent devices.
Rights: ©2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:エネルギー・マテリアル融合領域研究センター (Center for Advanced Research of Energy and Material) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 渡辺 精一

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