Self-assembled flower-like nanostructures of InN and GaN grown by plasma-assisted molecular beam epitaxy

Bulletin of Materials Science

关键词: Nitrides;    nano-flowers;    photoluminescence;    RF–MBE.;   

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Nanosized hexagonal InN flower-like structures were fabricated by droplet epitaxy on GaN/Si(111) and GaN flower-like nanostructure fabricated directly on Si(111) substrate using radio frequency plasma-assisted molecular beam epitaxy. Powder X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to study the crystallinity and morphology of the nanostructures. Moreover, X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL) were used to investigate the chemical compositions and optical properties of nano-flowers, respectively. Activation energy of free exciton transitions in GaN nano-flowers was derived to be ∼ 28.5 meV from the temperature dependent PL studies. The formation process of nanoflowers is investigated and a qualitative mechanism is proposed.

【 授权许可】

CC BY