InAs/GaAs quantum dots grown on different GaAs substrates with graded In x Ga1 − x As strain-reducing layer

Frontiers of Optoelectronics - Tập 3 - Trang 241-244 - 2010
Shuping Fei1, Zhongwei Shi1, Lirong Huang1
1Wuhan National Laboratory for Optoelectronics, College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan, China

Tóm tắt

Self-assembled InAs quantum dots with graded composition strain-reducing layer (SRL) grown on exact substrates were studied. It is shown that a graded In x Ga1 − x As SRL leads to growth quality improvement, emission efficiency enhancement, and wavelength blueshift. Samples grown on 2° misoriented substrates with different In contents in graded In x Ga1 − x As SRL were also investigated, and emission efficiency enhancement and wavelength blueshift were found when graded SRL was introduced and when the change rate of In content in graded In x Ga1 − x As SRL was enlarged.

Tài liệu tham khảo

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