柱状纳米系统电子和空穴的能量和寿命(英文)  

Energy and life of electrons and holes in the columnar nanometer system

作　　者：吴强[1] 唐可[1] 

机构地区：[1]重庆文理学院电子电气工程学院,重庆402160

出　　处：《原子与分子物理学报》2013年第6期1017-1024,共8页Journal of Atomic and Molecular Physics

基　　金：重庆市教委科技项目(KJ121209);重庆文理学院人才引进项目(Z2011RCYJ03)

摘　　要：利用S-矩阵理论,在有效质量近似下,求出柱状纳米系统电子和空穴的能量和寿命,并与球状纳米系统相比较.以HgS/CdS/HgS柱状纳米系统为例,探讨了线度和势垒宽度对电子和空穴的能量和寿命的影响.结果表明:柱状纳米系统中,电子和空穴的能量和寿命随线度的变化规律相似,即势垒宽度一定时,能量随内半径增大而减小,寿命随内半径增大而增大;内半径一定时,能量随势垒宽度增大而减小,但变化甚微,而寿命随势垒宽度增大而迅速增大;势垒宽度Δ<4aCdS时,电子和空穴的寿命均为零,但电子和空穴寿命不为零的势垒宽度范围不同,空穴的寿命要比电子的寿命小.柱状和球状纳米系统电子和空穴寿命的变化规律相似,形状的影响很小.Using S-matrix theory and the effective mass approximation, the energy and life of electrons and holes are obtained in the columnar nanometer system, and compared with the spherical nanometer systems. Taking HgS/CdS/HgS columnar nanometer system as example, we have studied the influences of the size and the potential barrier width on the energy and the life of electrons and holes. The results show that： in the columnar nanometer systems, the energy and the life of electrons and holes change with the size and the potential barrier width, and they show similar tendency in this regard, i. e. , fixing barrier width, the energy decreases with increasing inner radius, while the life increases with increasing inner radius~ for a given inner radius, the energy decreases slightly with increasing barrier width, while the life increases with increasing barrier width. When barrier width △ 〈 4aCdS, the life of electrons and holes is equal to zero. If the life is not equal to zero, then the ranges of barrier width are different for e- lectrons and holes; when electrons＇ life is already long, holes＇ life is still small. At last, shape has a lit- tle impact on electrons＇ and holes＇ life for both spherical and columnar nanometer systems.

关 键 词：柱状纳米系统 电子和空穴 能量 寿命 

分 类 号：O471.1[理学—半导体物理] O488[理学—物理]