On the way to the II-VI quantum dot VCSEL

被引:7
作者
Passow, T [1 ]
Klude, M [1 ]
Kruse, C [1 ]
Leonardi, K [1 ]
Kröger, R [1 ]
Alexe, G [1 ]
Sebald, K [1 ]
Ulrich, S [1 ]
Michler, P [1 ]
Gutowski, J [1 ]
Heinke, H [1 ]
Hommel, D [1 ]
机构
[1] Univ Bremen, Inst Festkorperphys, D-28334 Bremen, Germany
来源
ADVANCES IN SOLID STATE PHYSICS 42 | 2002年 / 42卷
关键词
D O I
10.1007/3-540-45618-X_2
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Formation mechanisms of quantum (lots in the system CdSe/ZnSe are thoroughly analyzed in this paper. Defect free QDs are generated by segregation enhanced CdSe reorganisation and not by the Stranski-Krastanov growth mode. Stacking fault formation is enhanced in QD stacks and reduced by using strain compensating ZnSSe spacer layers. For a fivefold QD stack in a laser structure a T(0) value of about 1200K up to 100K was determined by threshold measurements. Electrically pumped lasing at room temperature was achieved above a threshold current density of 7.5 kA/cm(2). Degradation measurements prove a higher stability of QDs against high current injection as compared to quantum wells. High reflectivities of above 99 % for undoped and p-type doped distributed Bragg reflectors based on ZnSe and MgS/ZnSe superlattices have been obtained. Monolithic vertical resonators possess a quality factor of about 100.
引用
收藏
页码:13 / 25
页数:13
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