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Proceedings Paper

Quantum dots-in-a-well infrared photodetectors for long wavelength infrared detection
Author(s): L. Höglund; P. O. Holtz; L. Ouattara; C. Asplund; Q. Wang; S. Almqvist; E. Petrini; H. Malm; J. Borglind; S. Smuk; A. Mikkelsen; E. Lundgren; H. Pettersson; J. Y. Andersson
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Paper Abstract

We report on a quantum dots-in-a-well infrared photodetector (DWELL QDIP) grown by metal organic vapor phase epitaxy. The DWELL QDIP consisted of ten stacked InAs/In0.15Ga0.85As/GaAs QD layers embedded between n-doped contact layers. The density of the QDs was about 9 x 1010 cm-2 per QD layer. The energy level structure of the DWELL was revealed by optical measurements of interband transitions, and from a comparison with this energy level scheme the origin of the photocurrent peaks could be identified. The main intersubband transition contributing to the photocurrent was associated with the quantum dot ground state to the quantum well excited state transition. The performance of the DWELL QDIPs was evaluated regarding responsivity and dark current for temperatures between 15 K and 77 K. The photocurrent spectrum was dominated by a LWIR peak, with a peak wavelength at 8.4 μm and a full width at half maximum (FWHM) of 1.1 μm. At an operating temperature of 65 K, the peak responsivity was 30 mA/W at an applied bias of 4 V and the dark current was 1.2×10-5 A/cm2. Wavelength tuning from 8.4 μm to 9.5 μm was demonstrated, by reversing the bias of the detector.

Paper Details

Date Published: 29 September 2006
PDF: 13 pages
Proc. SPIE 6401, Optical Materials in Defence Systems Technology III, 640109 (29 September 2006); doi: 10.1117/12.690010
Show Author Affiliations
L. Höglund, Acreo AB (Sweden)
P. O. Holtz, Linköping Univ. (Sweden)
L. Ouattara, Lund Univ. (Sweden)
C. Asplund, Acreo AB (Sweden)
Q. Wang, Acreo AB (Sweden)
S. Almqvist, Acreo AB (Sweden)
E. Petrini, Acreo AB (Sweden)
H. Malm, Acreo AB (Sweden)
J. Borglind, Acreo AB (Sweden)
S. Smuk, Acreo AB (Sweden)
A. Mikkelsen, Lund Univ. (Sweden)
E. Lundgren, Lund Univ. (Sweden)
H. Pettersson, Halmstad Univ. (Sweden)
Lund Univ. (Sweden)
J. Y. Andersson, Acreo AB (Sweden)

Published in SPIE Proceedings Vol. 6401:
Optical Materials in Defence Systems Technology III
James G. Grote; Francois Kajzar; Mikael Lindgren, Editor(s)

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