Intraband photoresponse of SiGe quantum dot/quantum well multilayers

被引:25
作者
Bougeard, D [1 ]
Brunner, K [1 ]
Abstreiter, G [1 ]
机构
[1] Tech Univ Munich, Walter Schottky Inst, D-85748 Garching, Germany
关键词
SiGe; quantum dots; intersubband; photocurrent;
D O I
10.1016/S1386-9477(02)00640-9
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In this contribution we study the intravalence band photoexcitation of holes from self-assembled Ge quantum dots (QDs) in Si followed by spatial carrier transfer into SiGe quantum well (QW) channels located close to the Ge dot layers. The structures show maximum response in the important wavelength range 3-5 mum. The influence of the SiGe hole channel on photo- and dark current is studied depending on temperature and the spatial separation of QWs and dot layers. Introduction of the SiGe channel in the active region of the structure increases the photoresponsivity by up to about two orders of magnitude to values of 90 mA/W at T = 20 K. The highest response values are obtained for structures with small layer separation (10 nm) that enable efficient transfer of photoexcited holes from QD to QW layers. The results indicate that Si/Ge QD structures with lateral photodetection promise very sensitive large area mid-infrared photodetectors with integrated readout microelectronics in Si technology. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:609 / 613
页数:5
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