The transition mechanisms of quantum-dot/quantum-well mixed-mode infrared photodetectors

被引：2
作者：
Lin, Shih-Yen [1 ,2 ,3 ]
Chou, Shu-Ting [1 ]
Lin, Wei-Hsun [4 ]
机构：
[1] Acad Sinica, Res Ctr Appl Sci, Taipei 11529, Taiwan
[2] Natl Chiao Tung Univ, Dept Photon, Hsinchu 30010, Taiwan
[3] Natl Taiwan Ocean Univ, Inst Optoelect Sci, Chilung 20224, Taiwan
[4] Natl Tsing Hua Univ, Inst Elect Engn, Hsinchu 30013, Taiwan
来源：
INFRARED PHYSICS & TECHNOLOGY | 2009年 / 52卷 / 06期
关键词：
Quantum-dot infrared photodetectors; Quantum dots; HIGH-TEMPERATURE OPERATION;
D O I：
10.1016/j.infrared.2009.05.007
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
The transition mechanisms of a 10-period quantum-dot (QD)/quantum-well (QW) mixed-mode infrared photodetector is investigated in this paper. Both mid-wavelength infrared (MWIR) and long-wavelength infrared (LWIR) responses are observed for the device. The lower normal incident absorption of the LWIR peak suggests that the QW intra-band transition is responsible for the response while the QD intra-band transition for the MWIR response. Due to the coexistence of MWIR and LWIR responses, the MWIR response should be resulted from one-photon transition while the LWIR response from the two-photon transition. To explain the transition mechanisms of the MMIP device, a model is proposed in this paper. The increases of both MWIR and LWIR responses with increasing measurement temperatures observed for the device are attributed to the increase of electrons in the QW ground state/wetting layer state resulted from the increase of one-photon absorption process with increasing temperatures. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：268 / 271
页数：4
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