Calculated stresses in multilayered heteroepitaxial structures
Calculated stresses in multilayered heteroepitaxial structures
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DOI：
10.1063/1.323970
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发表时间：
1977-06
影响因子：
3.2
通讯作者：
G. Olsen;M. Ettenberg
中科院分区：
文献类型：
--
作者：
G. Olsen;M. Ettenberg
得到了多层复合材料各层内应力随层内位置变化的封闭式表达式。在计算中假设了相等的各向同性弹性常数，尽管发现由该假设引入的误差变化不超过弹性常数的差异。不等的弹性常数可以通过计算机解来处理。作为该技术的一个例子，计算了异质结AlxGa 1 −xAs/GaAs激光器中的应力。向有源GaAs区添加Al显示出对有源区应力具有剧烈影响，将其从拉伸变为压缩。这种应力符号的变化与激光器工作寿命的改善有关。
A useful closed‐form expression for stresses within individual layers of a multilayer composite has been obtained as a function of position within the layer. Equal and isotropic elastic constants were assumed in the calculation, although the error introduced by this assumption is found to vary by no more than the difference in elastic constants. Unequal elastic constants may be handled via computer solutions. The stresses within heterojunction AlxGa1−xAs/GaAs lasers are calculated as an example of the technique. The addition of Al to the active GaAs region is shown to have a drastic effect upon the active‐region stress, changing it from tension to compression. This change of sign in stress is correlated with improvements in operating lifetimes of lasers.