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arXiv 0705.0811cond-mat.mtrl-sci
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浅离子注入层瞬态增强扩散方程组

Set of equations for transient enhanced diffusion in shallow ion-implanted layers

O. I. Velichko, Yu. P. Shaman, A. K. Fedotov, A. V. Masanik

摘要:

为了模拟表面或界面附近的瞬态增强扩散,提出并分析了一组描述离子注入层中杂质扩散和掺杂原子与点缺陷的准化学反应的方程。得到的扩散方程考虑到不同的电荷状态的移动或不移动的物种和漂移的移动物种在内置的电场和弹性应力场。自激子在表面的吸收和缺陷在弹性应力作用下的漂移导致了点缺陷的不均匀分布。分析和数值计算表明,考虑到不均匀的缺陷分布,可以解释离子注入层退火过程中表面附近的“上坡”杂质扩散现象。对浅注入层退火后硼浓度分布的计算结果与实验数据吻合较好,证实了所提出的方程的有效性。

英文摘要:

To simulate the transient enhanced diffusion near the surface or interface, a set of equations describing the impurity diffusion and quasichemical reactions of dopant atoms and point defects in ion-implanted layers is proposed and analyzed. The diffusion equations obtained take into account different charge states of mobile or immobile species and drift the mobile species in the built-in electric field and field of elastic stresses. The absorption of self-interstitials on the surface and drift of the defects due to elastic stresses result in the nonuniform distributions of point defects. It was shown analytically and by means of numerical calculations that consideration of the nonuniform defect distributions enables one to explain the phenomenon of "uphill" impurity diffusion near the surface during annealing of ion-implanted layers. The performed calculations of the boron concentration profile after annealing of a shallow implanted layer agree well with the experimental data confirming the efficiency of the proposed equations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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