Characterization and Growth Mechanisms of Low Dimensional InP Materials
Indium phosphide(InP)is an important Ⅲ-Ⅴ semiconductor material that has recently re-ceived considerable attention because of its unique optical and electrical properties.Numerous studies have demonstrated its potential applications in optoelectronics,catalysis,and medicine.However,challenges remain in the controllable preparation and large-scale synthesis of low dimensional InP nano-materials.In addressing these issues,we successfully produced a remarkable quantity of high-quality InP nanowires on Si/SiO2 substrates using chemical vapor deposition(CVD).In addition,we grew a substantial amount of InP nanopillars on polycrystalline InP substrates using the in-situ growth method.The nanomaterials were observed using scanning electron microscopy(SEM).The nanowires had smooth surfaces with diameters ranging from 30 nm to 65 nm,and the film composed of nanowires was approximately 35 μm thick.The nanopillars had diameters distributed in the range of 550-850 nm,and the film composed of nanopillars was approximately 12 μm thick.The nanomaterials were analyzed using energy dispersive spectroscopy(EDS)and X-ray photoelectron spectroscopy(XPS)to determine their composition,which was found to be InP.Raman spectroscopy was used to determine the chemical structure of the nanomaterials,which was further analyzed.Transmission electron microscopy(TEM)was used to observe the microstructure of the nanomaterials.The nanowires prepared for this study were found to have a high degree of crystallinity,with growth in the[111]direction.Analysis of the nanow-ire crystal properties using selected area electron diffraction(SAED)revealed clear diffraction points in-dicating a single crystal structure.Luminescence properties were analyzed using photoluminescence(PL)spectroscopy.Furthermore,the formation mechanism of nanowires and nanopillars was dis-cussed.Nanowires grew following the vapor-liquid-solid(VLS)mechanism,whereas nanopillars grew following the solid-liquid-solid(SLS)mechanism.These studies provide additional opportunities for the controlled preparation and large-scale production of InP nanomaterials.
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