纳米半导体合金禁带宽度的尺寸、成分效应

摘要

基于熔化温度的尺寸效应模型，通过考虑原子间交互作用力，建立纳米半导体合金禁带宽度尺寸、成分效应模型。根据该模型，纳米半导体合金的禁带宽度随尺寸的减小而增大，当纳米尺寸小于5 nm时，禁带宽度随成分的变化接近线性关系。随着尺寸的增大，在弯曲常数的作用下，禁带宽度从近似线性函数转变为非线性函数。函数模型预测结果与实验结果具有很好的一致性，证实模型的有效性。%Based on a thermodynamic model for size dependent melting temperature,a simple model has been established for size and composition dependent on the band-gap by considering the interaction force between atoms. It predicts an increase of the band-gap of the nanosemiconductor alloy with the decrease of the size.The band-gap is an approximate linear function of size when the size is less than 5 nm. And band-gap becomes a nonlinear function with the increase of the size.The accuracy of mod⁃el prediction is confirmed by the experimental and simulation results.