Strain Compensation in Single ZnSe/CdSe Quantum Wells: Analytical Model and Experimental Evidence

被引:3
作者
Rieger, Torsten [1 ,2 ]
Riedl, Thomas [3 ]
Neumann, Elmar [2 ,4 ]
Gruetzmacher, Detlev [1 ,2 ]
Lindner, Joerg K. N. [3 ]
Pawlis, Alexander [1 ,2 ]
机构
[1] Forschungszentrum Julich, Peter Grunberg Inst 9, Wilhelm Johnen Str, D-52425 Julich, Germany
[2] Forschungszentrum Julich, JARA FIT, Wilhelm Johnen Str, D-52425 Julich, Germany
[3] Univ Paderborn, Dept Phys, Warburger Str 100, D-33098 Paderborn, Germany
[4] Forschungszentrum Julich, Peter Grunberg Inst 8, Wilhelm Johnen Str, D-52425 Julich, Germany
关键词
quantum well; strain compensation; molecular beam epitaxy; geometric phase analysis; molecular statics simulations; critical thickness; BEAM ELECTRON-DIFFRACTION; RESOLUTION; ZNSE; CDSE; DEFECTS; EPITAXY; STRESS;
D O I
10.1021/acsami.6b15824
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The lattice mismatch between CdSe and ZnSe is known to limit the thickness of ZnSe/CdSe quantum wells on GaAs (001) substrates to about 2-3 monolayers. We demonstrate that this thickness can be enhanced significantly by using In0.12Ga0.88As pseudo substrates, which generate alternating tensile and compressive strains in the ZnSe/CdSe/ZnSe layers resulting in an efficient strain compensation. This method enables to design CdSe/ZnSe quantum wells with CdSe thicknesses ranging from 1 to 6 monolayers, covering the whole visible spectrum. The strain compensation effect is investigated by high resolution transmission electron microscopy and supported by molecular statics simulations. The model approach with the supporting experimental measurements is sufficiently general to be also applied to other highly mismatched material combinations for the design of advanced strained heterostructures.
引用
收藏
页码:8371 / 8377
页数:7
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