Compositional disordering of InGaAs/GaAs heterostructures by low-temperature-grown GaAs layers

被引：43

作者：

Tsang, JS ^{[1
]}

Lee, CP ^{[1
]}

Lee, SH ^{[1
]}

Tsai, KL ^{[1
]}

Tsai, CM ^{[1
]}

Fan, JC ^{[1
]}

机构：

[1] NATL CHIAO TUNG UNIV,INST ELECTR,HSINCHU 30050,TAIWAN

来源：

JOURNAL OF APPLIED PHYSICS | 1996年 / 79卷 / 02期

关键词：

D O I：

10.1063/1.360810

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Compositional disordering of InGaAs/GaAs superlattices using a low-temperature-grown GaAs cap layer (LT-GaAs) by molecular beam epitaxy has been studied. The disordering of the superlattice was verified by photoluminescence and double-crystal x-ray rocking curve measurements. The Ga-vacancy-enhanced interdiffusion due to the presence of LT-GaAs was found to be the disordering mechanism. Diffusion equations and the Schrodinger's equation were solved numerically to obtain the composition profile and the transition energies in the disordered quantum well, respectively. The simulated energy shifts for samples under different annealing conditions agreed very well with the experimental results. The calculated effective diffusivity for the In-Ga interdiffusion has an activation energy of 1.63 eV, which is smaller than the activation energy 1.93 eV, for intrinsic interdiffusion. The diffusivity for the enhanced In-Ga interdiffusion due to the presence of LT-GaAs is about two orders of magnitude larger than the intrinsic In-Ga diffusivity. (C) 1996 American Institute of Physics.

引用

页码：664 / 670

页数：7

共 22 条

[21] DOSE-DEPENDENT MIXING OF ALAS-GAAS SUPERLATTICES BY SI ION-IMPLANTATION [J].