Photocurrent spectroscopy of site-controlled pyramidal quantum dots

被引：3
|
作者：
Mohan, A. [1 ]
Nevou, L. [1 ]
Gallo, P. [2 ]
Dwir, B. [2 ]
Rudra, A. [2 ]
Kapon, E. [2 ]
Faist, J. [1 ]
机构：
[1] ETH, Inst Quantum Elect, CH-8093 Zurich, Switzerland
[2] Ecole Polytech Fed Lausanne, Lab Phys Nanostruct, CH-1015 Lausanne, Switzerland
来源：
APPLIED PHYSICS LETTERS | 2012年 / 101卷 / 03期
关键词：
INFRARED PHOTODETECTORS; ABSORPTION; DETECTORS; LAYER;
D O I：
10.1063/1.4737426
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Intraband photocurrent spectroscopy of site-controlled pyramidal quantum dots by inserting them into the intrinsic region of n-i-n like quantum dot infrared photodetector structure is reported. The photovoltaic response is observed in the mid-infrared region. A peak responsivity of 0.4 mA/W at 120meV (lambda = 10 mu m) is observed at 10K at -2 V bias. The ability to engineer states in the conduction band of the QDs has been exploited to tune their photocurrent response from 10 mu m to 18 mu m with a narrow spectral width of Delta lambda/lambda = 0.17. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4737426]
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页数：3
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