| Autor: |
Liangqing Zhu, Jun Shao, Xiang Lü, Shaoling Guo, Junhao Chu |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; Jan2011, Vol. 109 Issue 1, p013509, 6p, 2 Diagrams, 5 Graphs |
| Abstrakt: |
Temperature-dependent photoluminescence (PL) measurements are carried out on lattice-matched and compressively strained GaxIn1-xP/(Al0.66Ga0.34)yIn1-yP quantum wells (QWs) with CuPt-type long-range (LR) ordering. Experimental data show that compressive strain and substrate misorientation of the QWs affect the degree of LR ordering. The compressive strain competes with the misorientation of 6° off toward [111]A (denoted as 6 °A) significantly. It not only affects the distribution of domains with different degree of LR ordering in the x-y plane but also introduces fluctuation of the degree of LR ordering along the z direction of the QWs, which in turn causes the splitting of PL peaks. A phenomenological model is proposed to account for the experimental phenomena based on the principle of minimum total free energy. The results suggest that 6 °A misorientation should not be preferable for compressively strained GaxIn1-xP QWs with LR ordering. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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