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Selective optical doping to predict the performance and reveal the origin of photocurrent peaks in quantum dots-in-a-well infrared photodetectors
Acreo AB, S-16440 Kista, Sweden .
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
Halmstad University, Centre Appl Math and Phys, S-30118 Halmstad, Sweden Lund University, Solid State Phys and Nanometer Struct Consortium, S-22100 Lund, Sweden .
IRnova, S-16440 Kista, Sweden .
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2009 (English)In: INFRARED PHYSICS and TECHNOLOGY, ISSN 1350-4495, Vol. 52, no 6, 272-275 p.Article in journal (Refereed) Published
Abstract [en]

Resonant optical pumping across the band gap was used as artificial doping in InAs/In0.15Ga0.85As/GaAs quantum dots-in-a-well infrared photodetectors. Through efficient filling of the quantum dot energy levels by simultaneous optical pumping into the ground states and the excited states of the quantum dots, the response was increased by a factor of 10. Low temperature photocurrent peaks observed at 120 and 148 meV were identified as intersubband transitions emanating from the quantum dot ground state and the quantum dot excited state, respectively by a selective increase of the electron population in the different quantum dot energy levels.

Place, publisher, year, edition, pages
2009. Vol. 52, no 6, 272-275 p.
Keyword [en]
QDIP, DWELL, Infrared, Detector, Quantum dot, Optical pumping, Doping
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-53054DOI: 10.1016/j.infrared.2009.05.025OAI: oai:DiVA.org:liu-53054DiVA: diva2:286650
Available from: 2010-01-15 Created: 2010-01-15 Last updated: 2010-01-15

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Holtz, Per-Olof

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