Metastable group II sulphides grown by MBE: surface morphology and crystal structure

Metastable II–VI sulphides: Growth, characterization and stability

“…Before analysis of these samples, the model for the phase transition based on the observations RHEED and DXRC, was that it involved the complete conversion of the whole layer and was nearly instantaneous [10,11,14,15]. However, in these samples both phases coexist.…”

“…We previously examined one particular route [15], proceeding via an orthorhombic Imm2 intermediate [51], which was devised by Catti [48] and subsequently shown to be a universal route for all ZB compounds, irrespective of ionicity [47]. However, recently another route allowed by symmetry between ZB and RS has been identified by Duranduru [50] that is more favourable for highly ionic MgS.…”

“…There have been several previous reviews of this work, which concentrated either on the use of the ultra wide bandgap semiconductor MgS to confine carriers in ZnSe quantum wells or CdSe quantum dots [14], or have discussed the stability of the metastable ZB compounds MgS and MnS [15].…”

MBE growth of MgS nanowires characterized using AFM

“…If the initial relaxation of thinner layers, such as the ones investigated here, is anisotropic, then both of the above mechanisms predict that 1D ridges form on the surface. However, for a given ridge direction, the models predict that the relaxation is in orthogonal directions, making it possible to distinguish between them using a technique such as reciprocal space mapping [10].…”

A comparison of ZnMgSSe and MgS wide bandgap semiconductors used as barriers: Growth, structure and luminescence properties

“…Here, the MgS layer is seen to display pronounced 1D ridges, which are characteristic of MgS surfaces under a wide range of growth conditions [17], but have never been observed on Zn 0.2 Mg 0.8 S 0.64 Se 0.36 surfaces at any thickness. We have previously suggested that the nanowires arise from a partial anisotropic relaxation occurring in thicker MgS layers [14,18] and their absence in the quaternary alloy is further evidence that these structures are pseudomorphic.…”