Photo and dark current noise in self-assembled quantum dot infrared photodetectors

被引：15

作者：

Carbone, A. ^{[1
]}

Introzzi, R. ^{[1
]}

Liu, H. C. ^{[2
]}

机构：

[1] Politecn Torino, Dept Phys, I-10129 Turin, Italy

[2] Natl Res Council Ottawa, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada

来源：

INFRARED PHYSICS & TECHNOLOGY | 2009年 / 52卷 / 06期

关键词：

Quantum dot infrared photodetectors; Dark current noise; Photo current noise; GAIN; TEMPERATURE;

D O I：

10.1016/j.infrared.2009.09.003

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Current noise is investigated in InAs/GaAs self-assembled quantum dot infrared photodetectors in the dark and under irradiation at T = 4.2 K. At low temperature, the noise is consistent with a mechanism of fluctuations driven by the electric field, related to field- and photon-assisted tunneling rather than trapping-detrapping of charge carriers from the quantum dots. In particular, a strong noise suppression effect determines the decrease of the fluctuation intensity as the voltage increases in the negative differential photoconductivity region of the I-V characteristics. The noise suppression mechanism acts in the dark and under irradiation. The noise intensity decreases consistently with the occurrence of the nonlinear differential photoconductivity effect. (C) 2009 Elsevier B.V. All rights reserved.

引用

页码：260 / 263

页数：4

共 22 条

[1] Two photon absorption in quantum dot-in-a-well infrared photodetectors [J].