Normal Incident Long Wave Infrared Quantum Dash Quantum Cascade Photodetector

We demonstrate a quantum dash quantum cascade photodetector (QDash-QCD) by incorporating self-assembled InAs quantum dashes into the active region of a long wave infrared QCD. Sensitive photoresponse to normal incident light at 10 μm was observed, which is attributed to the intersubband (ISB) transi...

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Detalles Bibliográficos
Autores principales: Wang, Feng-Jiao, Ren, Fei, Liu, Shu-Man, Zhuo, Ning, Zhai, Shen-Qiang, Liu, Jun-Qi, Liu, Feng-Qi, Wang, Zhan-Guo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2016
Materias:
Nano Express
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5017976/
https://www.ncbi.nlm.nih.gov/pubmed/27613069
http://dx.doi.org/10.1186/s11671-016-1611-6
Descripción
Sumario:We demonstrate a quantum dash quantum cascade photodetector (QDash-QCD) by incorporating self-assembled InAs quantum dashes into the active region of a long wave infrared QCD. Sensitive photoresponse to normal incident light at 10 μm was observed, which is attributed to the intersubband (ISB) transitions in the quantum well/quantum dash (QW/QDash) hybrid absorption region and the following transfer of excited electrons on the extraction stair-like quantum levels separated by LO-phonon energy. The high density InAs quantum dashes were formed in the Stranski-Krastanow mode and stair-like levels were formed by a lattice matched InGaAs/InAlAs superlattice. A stable responsivity from 5 mA/W at 77 K to 3 mA/W at as high as 190 K was observed, which makes the QDash-QCD promising in high temperature operation.

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