论文部分内容阅读
基于组合杆的平衡条件,分别建立了晶格失配、热失配以及由两者共同导致的异质结构应变和应力分布模型,并获得了异质结构的晶格失配应变、热失配应变、弯曲应变以及曲率半径的分析解.同时,运用所建的模型,计算了HgCdTe/CdZnTe异质结构的应变和应力分布.结果表明:应力最大值均在界面处,而中性面仅是材料厚度和弹性参数的函数,与晶格失配、晶格弛豫、热失配等参数无关,且该异质结构的曲率半径是衬底厚度的函数,随衬底厚度的减小而减小,而要保证HgCdTe/CdZnTe器件在液氮温度下不发生断裂,衬底的厚度必须大于临界值.
Based on the equilibrium conditions of the composite rods, lattice mismatch, thermal mismatch and the model of strain and stress distribution of the heterostructures are established respectively. The lattice mismatch strain, thermal mismatch Strain, bending strain and radius of curvature of the HgCdTe / CdZnTe heterostructures were calculated by using the model.The results show that the maximum stress is at the interface and the neutral surface is only The function of the material thickness and elastic parameters is independent of the parameters such as lattice mismatch, lattice relaxation and thermal mismatch, and the radius of curvature of the heterostructure is a function of the thickness of the substrate, decreasing as the substrate thickness decreases However, to ensure that the HgCdTe / CdZnTe device does not break at the liquid nitrogen temperature, the thickness of the substrate must be greater than the critical value.