Strain-driven synthesis of self-catalyzed branched GaAs nanowires
GaN nanowire (NW) arrays have been fabricated by the electrodeless photoelectrochemical (PEC) etching method for the first time. Under appropriate conditions, the etching process is just a dislocation-hunted process, in which the etching solution "digs down'' along the threading dislocations, resulting in the formation of GaN NWs by preferentially ...
We investigate the band structure of a compressively strained In(Ga)As/In(0.53)Ga(0.47)As quantum well (QW) on an InP substrate using the eight-band k.p theory. Aiming at the emission wavelength around 2.33 mu m, we discuss the influences of temperature, strain and well width on the band structure and on the emission wavelength of the QW. The wavel...
The GaAs based InGaAs metamorphic structures and their growth by molecular beam epitaxy(MBE) are investigated. The controlling of the source temperature is improved to realize the linearly graded InGaAs metamorphic structure precisely. The threading dislocations are reduced. We also optimize the growth and annealing parameters of the InGaAs quantum...
Crack-free GaN epitaxial layer was obtained through inserting 80 nm graded AlGaN buffer layer between GaN epilayer and high temperature AlN buffer on 2-in Si(111) substrates by metal organic chemical vapor deposition. This paper investigated the influence of AlGaN buffer thickness on the structural properties of the GaN epilayer. It was confirmed f...
Up to 500 nm thick crack-free Al(0.25)Ga(0.75)N and Al(0.32)Ga(0.68)N epilayers have been grown on Si (111) substrates. The surface morphology of samples was investigated by an optical microscope and a scanning electron microscope (SEM). Pits and shale-like surface structure have been observed. XRD rocking curve measurements indicate the crystal qu...
Molecular beam epitaxy growth of an InxGa1-xAs/GaAs quantum well(QW) structure(x equals to0.17 or0.3) on offcut(100) Ge substrate has been investigated. The samples were characterized by atomic force microscopy, photoluminescence(PL), and high resolution transmission electron microscopy. High temperature annealing of the Ge substrate is necessary t...