研究了用MOCVD方法生长InGaAlN四元合金材料的生长规律,发现生长温度在800~880 ℃, 其In组分随生长温度升高而降低. 用变温光致发光谱和时间分辨谱研究了InGaAlN的光学性质.光致发光谱表明InGaAlN的发光强度随温度衰减规律与InGaN类似,但比GaN慢,室温下比GaN的发光强度大1个数量级以上.时间分辨光谱表明,在InGaAlN中存在低维结构的铟聚集区--在没有高温GaN中间层的InGaAlN材料中存在类似量子盘的二维铟聚集区;而在有高温GaN中间层的InGaAlN材料中存在类似量子点的零维铟聚集区.
参考文献
[1] | Kim H S, Lin J Y, Jiang H X, et al. Piezoelectric effects on the optical properties of GaN/AlxGa1-xN multiple quantum wells[J]. Appl. Phys. Lett., 1998,73(23): 3426-3428. |
[2] | Zhang J, Yang J, Simin G, et al. Enhanced luminescence in InGaN multiple quantum wells with quaternary AlInGaN barriers[J]. Appl. Phys. Lett., 2000, 77(17): 2668-2670. |
[3] | Liu X, Lu D C, Wang L, et al. The dependence of growth rate of GaN buffer on growth parameters by MOVPE[J]. J. Crystal Growth, 1988, 193: 23-27. |
[4] | El-Masry N A, Behbehani M K, LeBoeuf S F, et al. Self-assembled AlInGaN quaternary superlattice structures[J]. Appl. Phys. Lett., 2001, 79(11): 1616-1618. |
[5] | Pavesi L, Matteo C. Stretched-exponential decay of the luminescence in porous silicon[J]. Phys. Rev. B, 1993, 48(23): 17625-17628. |
[6] | Kobitski A Y, Zhuravlev K S, Wagner H P, et al. Self-trapped exciton recombination in silicon nanocrystals[J]. Phys. Rev. B, 2001, 63: 115423(1-5). |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%