Tunable mid-infrared photodetectors employing Stark shifts of   intersubband transitions in In0.05Ga0.95As/Al0.32Ga0.68As/Al0.45Ga0.55As   asymmetric step quantum wells

doi:10.1016/j.spmi.2004.04.004

CORC > 北京大学 > 信息科学技术学院

	Tunable mid-infrared photodetectors employing Stark shifts of intersubband transitions in In0.05Ga0.95As/Al0.32Ga0.68As/Al0.45Ga0.55As asymmetric step quantum wells
	Wu, WG
刊名	superlattices and microstructures
	2004
关键词	mid-infrared photodetector InGaAs asymmetric step quantum well APPLIED ELECTRIC-FIELD INFRARED DETECTORS MULTIQUANTUM WELLS
DOI	10.1016/j.spmi.2004.04.004
英文摘要	Tunable mid-infrared (3-5 mum) photodetectors made of In0.05Ga0.95As/Al0.32Ga0.68As/Al0.45Ga0.55As asymmetric step multiple quantum wells are reported. The detectors exhibit photovoltaic-type photocurrent response with the peak wavelengths modulated by an applied bias in the 3-5.3 mum infrared atmospheric transmission window. The bias-controlled modulation of the peak wavelength of the main response is due to the Stark shifts of the intersubband transitions from the ground states to the first excited states in the quantum wells. By expanding the electron wavefunction in terms of the normalized plane wave basis within the framework of the effective-mass envelope-function approximation, a theoretical calculation of the linear Stark effects of the intersubband transitions between the ground and the first excited states in the asymmetric step wells is carried out and the results agree well with experimental measurements. The key features of the photodetectors, including the photocurrent response, dark current, and black-body detectivity, which is about 1.0 x 10(10) cm Hz(1/2)/W at 77 K under a bias of +/-7 V, are close to the requirements for practical applications. (C) 2004 Elsevier Ltd. All rights reserved.; Physics, Condensed Matter; SCI(E); EI; 3; ARTICLE; 1-2; 25-34; 35
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/153097]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Wu, WG. Tunable mid-infrared photodetectors employing Stark shifts of intersubband transitions in In0.05Ga0.95As/Al0.32Ga0.68As/Al0.45Ga0.55As asymmetric step quantum wells[J]. superlattices and microstructures,2004.
APA	Wu, WG.(2004).Tunable mid-infrared photodetectors employing Stark shifts of intersubband transitions in In0.05Ga0.95As/Al0.32Ga0.68As/Al0.45Ga0.55As asymmetric step quantum wells.superlattices and microstructures.
MLA	Wu, WG."Tunable mid-infrared photodetectors employing Stark shifts of intersubband transitions in In0.05Ga0.95As/Al0.32Ga0.68As/Al0.45Ga0.55As asymmetric step quantum wells".superlattices and microstructures (2004).