摘要
The average bond energy method is popularized and applied to study band offsets at strained layer heterojunctions. By careful examination of hydrostatic and uniaxial strain actions on the band offset parameter Emv,it is found that the average band offset parameter Emv,av=Em-Ev, av remains basically unchanged under different strain conditions. Therefore, provided the band offset parameter before strain Emv,0 of bulk material is calculated, and the experiment values of deformation potential b and spin-orbit (SO) splitting energy △0 are quoted, the Emv at strained layer can be obtained by a simple and convenient algebraic calculation. Thus the valence band offset △Ev at strained layer heterojunction can also be predicted conveniently. This simplified calculation method is characterized by decreased calculation amount and increased conviction due to use as many as possible the experiment values.
The average bond energy method is popularized and applied to study band offsets at strained layer heterojunctions. By careful examination of hydrostatic and uniaxial strain actions on the band offset parameter E_(mv),it is found that the average band offset parameter E_(mv,av)=E_m-E_(v, av) remains basically unchanged under different strain conditions. Therefore, provided the band offset parameter before strain E_(mv,0) of bulk material is calculated, and the experiment values of deformation potential b and spin-orbit (SO) splitting energy △_0 are quoted, the E_(mv) at strained layer can be obtained by a simple and convenient algebraic calculation. Thus the valence band offset △E_v at strained layer heterojunction can also be predicted conveniently. This simplified calculation method is characterized by decreased calculation amount and increased conviction due to use as many as possible the experiment values.
基金
Special Doctoral Research Foundation of Chinese State Commission of Education!(9538409 )
Natural Science Foundation of Fujian
关键词
键能
畸变位
异质结
带偏移
应力
晶体
Average bond energy
Deformation potential
Heterojunction band offset