电场和线度对半导体纳米管谱线强度和吸收系数的影响  

Influence of electric field and size on spectral line intensity and absorption coefficient of semiconductor nanotube

作　　者：吴强[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：《四川大学学报（自然科学版）》2013年第6期1270-1276,共7页Journal of Sichuan University(Natural Science Edition)

基　　金：重庆市教育委员会科学技术研究项目(KJ121209)

摘　　要：建立在无限深势阱下的半导体纳米管物理模型,在偶极近似下,求出半导体纳米管的谱线吸收系数、强度和频率.以HgS为管层,CdS为内核和外壳的半导体纳米管为例,探讨了线度和电场对谱线吸收系数和强度以及频率的影响,结果表明:在相同线度下,不同能带不同能级间的量子跃迁发出谱线的频率和强度远大于同能带不同能级的情形,见到的谱线基本上是由不同能带不同能级跃迁时所发出;谱线的吸收系数和强度以及频率均随电场增大而增大;电场一定时,谱线的强度和吸收系数随线度增大而增大;谱线的吸收系数主要取决于电场和能级的跃迁情况,而与是否属同一能带无关.Under the infinite potential well, the physical model of the semiconductor nanotube is estab- lished. Using the dipole approximation, the spectral line intensity, absorption coefficient and frequency of the semiconductor nanotubes are obtained. From the example of the semiconductor nanotubes, the in- fluences of electric field and size on the spectral line intensity, absorption coefficient and frequency are also explored under the conditions of HgS on the tube domains and CdS kernel and outer layer. The re- sults show that. in the same size, the spectral line intensity and frequency which are emitted by the quantum transition between different energy levels in the different energy bands are much higher than that in the same energy band, the beheld spectral lines are emitted basically by the transitions between different energy levels in different energy bands. The spectral line intensity, and absorption coefficient and frequency all increase with the increasing electric field. The spectral line intensity and absorption co- efficient increase with the increasing size when the electric field is kept constant. The absorption coeffi- cient of the spectral line depends mainly on electric field and the transition between different energy lev- els, and is independent of that whether these energy levels are in the same energy band.

关 键 词：半导体纳米管 吸收系数 谱线强度 频率 

分 类 号：O472[理学—半导体物理]