Morphological, Structural and Optical Evolution of Ag Nanostructures on c-Plane GaN Through the Variation of Deposition Amount and Temperature

Mao Sui; Ming‑Yu Li; Puran Pandey; Quanzhen Zhang; Sundar Kunwar; Jihoon Lee

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자료유형: 학술저널

저자정보: Mao Sui (Kwangwoon University) Ming‑Yu Li (Kwangwoon University) Puran Pandey (Kwangwoon University) Quanzhen Zhang (Kwangwoon University) Sundar Kunwar (Kwangwoon University) Jihoon Lee (Kwangwoon University)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.24 No.2

발행연도: 2018.1

수록면: 337 - 350 (14page)

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Owing to their tunable properties, Ag nanostructures have been widely adapted in various applications and the morphologicalcontrol can determine their performance and effectiveness. In this work, we demonstrate the morphological and opticalevolution of Ag nanostructures on GaN (0001) by the systematic control of deposition amount at two distinctive annealingtemperatures. Based on the Volmer–Weber and coalescence growth models, the nanostructure growth commenced by thethermal solid-state-dewetting evolve in terms of size, density and configuration. At 450 °C, the round-dome shaped Agnanoparticles (regime I), irregular Ag nano-mounds (regime II) and void-layer structures (regime III) are observed alongwith the gradually increased deposition amount. As a sharp distinction, the solid state dewetting process occur more radicallyat 700 °C and also, the Ag sublimation and the effect on the nanostructure formation are observed in a clear regime shiftscaled by the deposition amount. Meanwhile, a strong dependency of reflectance spectra evolution on the Ag nanostructuremorphology is witnessed for both sets. In particular, Ag dipolar resonance peaks are significantly red-shifted from VIS toNIR regions along with the nanostructure evolution. The reflectance, PL and Raman intensity variation are also observedand discussed based on the evolution of Ag nanostructures.

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참고문헌 신청

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