High quality interconnected core/shell ZnO nanorod architectures grown by pulsed laser deposition on ZnO-seeded Si substrates. (January 2017)

• Record Type: Journal Article
• Authors: Inguva, Saikumar; Vijayaraghavan, Rajani K.; McGlynn, Enda; Mosnier, Jean-Paul
• Is Part Of: Superlattices and microstructures. Volume 101(2017)
• Page Start: 8
• Page End: 14
• Publication Date: 2017-01
• Subjects: ZnO -- Interconnected nanorods -- Core/shell nanorods -- Si wafer substrates -- Pulsed laser deposition -- 3.331 eV in ZnO photoluminescence; Superlattices as materials -- Periodicals; Microstructure -- Periodicals; Semiconductors -- Periodicals; Superréseaux -- Périodiques; Microstructure (Physique) -- Périodiques; Semiconducteurs -- Périodiques; 621.38152
• DOI: 10.1016/j.spmi.2016.11.031
• Languages: English
• ISSNs: 0749-6036

Abstract

Abstract: We report the production of vertically aligned and interconnected ZnO core/shell nanorods using pulsed laser deposition (PLD) in a continuous two-step growth process. X-ray diffraction studies showed wurtzite structure and c -axis orientation with a high degree of verticality. Scanning electron microscopy showed a characteristic interconnection morphology between the nanorod tips uniformly present over the entire sample surface area, while transmission electron microscopy revealed crystalline core/amorphous shell architecture. Strong bands at 98.7 cm −1 and 437.2 cm −1 (wurtzite ZnO low and high non-polar E2 modes) were the main features of the nanorod Raman spectra, again showing the high sample quality. Low-temperature PL data exhibited strong I6 emission and structured green band showing high optical quality. Electrical studies indicated n -type material with ohmic behaviour. The results are discussed in the context of the advantages offered by interconnected architectures of core/shell ZnO nanostructures for various applications. Highlights: Growth of high quality vertically aligned and interconnected ZnO core/shell nanorods. Growth by catalyst-free PLD in a continuous two-step growth process. Nanorods show good crystalline quality with a high degree of verticality. Nanorods show excellent uniformity, optical and electrical properties.