The effect of alloying small amounts of ZnO with ZnSe on the electronic band structure has been studied. Optical transitions in MBE-grown ZnO x Se 1-x epitaxial films (0 < x < 1.35%) were investigated using photoreflectance and photoluminescence spectroscopies. The fundamental band-gap energy of the alloys was found to decrease at a rate of about 0.1 eV per atomic percent of oxygen. The pressure dependence of the band gap was also found to be strongly affected by the O incorporation. Both the effects can be quantitatively explained by an anticrossing interaction between the extended states of the conduction band of ZnSe and the highly localized oxygen states located at approximately 0.22 eV above the conduction band edge.
ZnSeO alloy was grown by molecular-beam epitaxy up to 1.3% O composition on GaAs substrate using rf plasma. The crystal structure of epitaxial ZnSeO alloy was zinc-blende. O composition was estimated by a strain-free lattice constant. No phase separation was observed by in situ reflection high-energy electron diffraction and x-ray diffraction. Photoluminescence intensity was larger than that of ZnSe. The peak energy shifted toward lower energies with increasing O composition. The band-gap energy determined by photoluminescence excitation spectra decreased with increasing O composition. A bowing parameter as high as 8 eV was obtained. This large band-gap bowing widens the controllable energy-gap range of II-VI semiconductor.
We investigated Young's modulus of amorphous carbon (a-C) pillars that exhibited different properties depending on which of two fabrication methods were used, electron-beam-induced chemical vapor deposition (EB-CVD) or focused ion-beam-induced CVD (FIB-CVD). The Young's modulus of the FIB-CVD pillars was almost linearly proportional to the accelerating voltage, while that of the EB-CVD pillars showed a completely opposite results. Secondary electrons seemed to play an important role in the increase of Young's modulus of the pillars grown using EB-CVD.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.