材料科学
电介质
半导体
带隙
声子
纳米材料
纳米线
小型化
凝聚态物理
纳米尺度
晶格常数
光学
纳米技术
光电子学
衍射
物理
作者
M.P. Singh,Seskhantso Lara,N.J. Matjelo,Limakatso Lepekola,Moruti Kao,Mampesi Thato Matobako
标识
DOI:10.1142/s0219581x23500527
摘要
Based on cohesive energy, the size and shape effect on Bandgap, Dielectric constant and Phonon frequency of low-dimension semiconductor nanomaterials are predicted with structural miniaturization down to the nanoscale. It is projected that nanomaterial’s optical and electrical properties no longer remain constant but become tunable. The model reports that the bandgap increases while the dielectric constant and phonon frequency drop on decreasing size to the nanoscale. The bandgap variation, dielectric constant and phonon frequency are reported for spherical, thin film, nanowire, regular tetrahedral and regular octahedral shapes of semiconductor nanosolids. The shape effect becomes prominent as the form changes from spherical to regular tetrahedral shape up to the size limit of 20 nm. A good agreement between our model predictions and the available experimental and simulation data justifies the theory’s validity.
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