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1. 中国科学院 研究生院 北京,100049
2. 中国科学院激发态物理重点实验室, 中国科学院长春光学精密机械与物理研究所,吉林 长春,130033
收稿日期:2008-08-25,
修回日期:1900-01-02,
网络出版日期:2009-06-30,
纸质出版日期:2009-06-30
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阎大伟, 宋 航, 缪国庆, 等. 晶格失配对InAsxP1-x/InP发光特性的影响[J]. 发光学报, 2009,30(3):309-313.
YAN Da-wei, SONG Hang, MAO Guo-qing, et al. Lattice Mismatch Effect on Photoluminescence from InAsxP1-x/InP Heterostructuer[J]. Chinese journal of luminescence, 2009, 30(3): 309-313.
采用低压金属有机化学气相沉积(LP-MOCVD)技术
在掺Fe的半绝缘InP衬底上制备了InAs
0.157
P
0.843
外延层。利用变温光致发光研究了InAs
0.157
P
0.843
外延层在13~300 K温度范围内的发光特性
通过理论分析与计算
证实了在应力作用下InAs
0.157
P
0.843
外延层价带顶的轻重空穴带发生了劈裂
并研究了导带底与价带顶轻空穴带之间形成的复合发光峰在应力作用下随温度的变化规律。
The variable-temperature photoluminescence spectra of strained InAs
x
P
1-x
/InP heterostructuer were experimentally determined in the temperature range 13~300 K. A theoretical calculation was presented that takes into account the temperature-induced variations in band gap and biaxial strain to explain the PL spectra. The results showed that strain which is induced by lattice mismatch between epitaxial layer and substrate removes the degeneracy between the light- and heavy-hole states at the top of the valence band
and with temperature under 100 K
the recombinations from the conduction band to the split valence bands are both observed in the photoluminescence spectra. As temperature is raised
it results in an increasingly larger light-hole population than that of heavy-hole due to thermalization
so when temperature is beyond 100 K only the recombination from the conduction band to the light-hole state can be observed.We also find that the energy of the recombination between the conduction band and the light-hole and heavy-hole state changes as a function of temperature.
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. Olego D J, Okuno Y, Kawano T. Structural and optoelectronic properties and their relationship with strain relaxation in heteroepitaxial InP layers grown on GaAs substrates [J]. J. Appl. Phys., 1992, 71 (9):4492-4501.
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