Optical properties of core/shell spherical quantum dots

doi:10.1088/1674-1056/ab961a

中国物理B ›› 2020, Vol. 29 ›› Issue (9): 97802-097802.doi: 10.1088/1674-1056/ab961a

Optical properties of core/shell spherical quantum dots

Shuo Li(李硕), Lei Shi(石磊), Zu-Wei Yan(闫祖威)

College of Science, Inner Mongolia Agricultural University, Hohhot 010018, China

收稿日期:2020-04-04 修回日期:2020-05-20 接受日期:2020-05-25 出版日期:2020-09-05 发布日期:2020-09-05
通讯作者: Lei Shi E-mail:shi_lei_family@163.com
基金资助:
Project supported by the Natural Science Foundation of Inner Mongolia Autonomous Region, China (Grant Nos. 2019MS01006 and 2020MS01008), the Science Project of the Higher Education of Inner Mongolia Autonomous Region, China (Grant No. NJZY19047), the Doctoral Starting-up Foundation of Inner Mongolia Agricultural University, China (Grant No. BJ2013B-2), and the Grassland Talent Project, China.

Optical properties of core/shell spherical quantum dots

Shuo Li(李硕), Lei Shi(石磊), Zu-Wei Yan(闫祖威)

College of Science, Inner Mongolia Agricultural University, Hohhot 010018, China

Received:2020-04-04 Revised:2020-05-20 Accepted:2020-05-25 Online:2020-09-05 Published:2020-09-05
Contact: Lei Shi E-mail:shi_lei_family@163.com
Supported by:
Project supported by the Natural Science Foundation of Inner Mongolia Autonomous Region, China (Grant Nos. 2019MS01006 and 2020MS01008), the Science Project of the Higher Education of Inner Mongolia Autonomous Region, China (Grant No. NJZY19047), the Doctoral Starting-up Foundation of Inner Mongolia Agricultural University, China (Grant No. BJ2013B-2), and the Grassland Talent Project, China.

摘要/Abstract

摘要： In this study, the effects of quantum dot size on the binding energy, radiative lifetime, and optical absorption coefficient of exciton state in both GaN/Al_xGa_1-xN core/shell and Al_xGa_1-xN/GaN inverted core/shell quantum dot structures are studied. For the GaN/Al_xGa_1-xN core/shell structure, the variation trend of binding energy is the same as that of radiation lifetime, both of which increase first and then decrease with the increase of core size. For Al_xGa_1-xN/GaN inverted core/shell structure, the binding energy decreases first and then increases with core size increasing, and the trends of radiation lifetime varying with core size under different shell sizes are different. For both structures, when the photon energy is approximately equal to the binding energy, the peak value of the absorption coefficient appears, and there will be different peak shifts under different conditions.

关键词: spherical quantum dot, binding energy, optical absorption coefficient, exciton radiation lifetime

Abstract: In this study, the effects of quantum dot size on the binding energy, radiative lifetime, and optical absorption coefficient of exciton state in both GaN/Al_xGa_1-xN core/shell and Al_xGa_1-xN/GaN inverted core/shell quantum dot structures are studied. For the GaN/Al_xGa_1-xN core/shell structure, the variation trend of binding energy is the same as that of radiation lifetime, both of which increase first and then decrease with the increase of core size. For Al_xGa_1-xN/GaN inverted core/shell structure, the binding energy decreases first and then increases with core size increasing, and the trends of radiation lifetime varying with core size under different shell sizes are different. For both structures, when the photon energy is approximately equal to the binding energy, the peak value of the absorption coefficient appears, and there will be different peak shifts under different conditions.

Key words: spherical quantum dot, binding energy, optical absorption coefficient, exciton radiation lifetime

中图分类号: (Quantum dots)

78.67.Hc

73.21.La (Quantum dots) 71.35.-y (Excitons and related phenomena)

李硕, 石磊, 闫祖威. Optical properties of core/shell spherical quantum dots[J]. 中国物理B, 2020, 29(9): 97802-097802.

Shuo Li(李硕), Lei Shi(石磊), Zu-Wei Yan(闫祖威). Optical properties of core/shell spherical quantum dots[J]. Chin. Phys. B, 2020, 29(9): 97802-097802.

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Optical properties of core/shell spherical quantum dots

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