Fabrication of crystal α-Si₃N₄/Si-SiOx core-shell/Au-SiOx peapod-like axial double heterostructures for optoelectronic applications.
Novel crystal α-Si(3)N(4)/Si-SiO(x) core-shell/Au-SiO(x) peapod-like axial double heterostructural nanowires were obtained by directly annealing a Au covered SiO(2) thin film on a Si substrate. Our extensive electron microscopic investigation revealed that the α-Si(3)N(4) sections with a mathematical left angle bracket 101 mathematical right angle bracket growth direction were grown first, followed by growth of the Si-SiO(x) core-shell sections and finally growth of the Au-SiO(x) peapod-like sections. Through a series of systematically comparative experiments, a temperature-dependent multi-step vapor-liquid-solid growth mechanism is proposed. Room temperature photoluminescence measurement of individual nanowires reveals two emission peaks (410 and 515 nm), indicating their potential applications in light sources, laser or light emitting display devices.
State Key Laboratory of Surface Physics, Fudan University, Shanghai 200433, People's Republic of China.
Tianxiao
T
Nie
Zhi-Gang
ZG
Chen
Yueqin
Y
Wu
Yanan
Y
Guo
Jiuzhan
J
Zhang
Yongliang
Y
Fan
Xinju
X
Yang
Zuimin
Z
Jiang
Jin
J
Zou