Very high sensitivity operation in quantum dot infrared photodetectors

Seung Woong Lee, Jung Ho Park, Shinichi Fujimoto, Kazuhiko Hirakawa

Research output: Contribution to journalConference articlepeer-review


We report on photocurrent spectra of Be-doped p-type modulation-doped quantum dot infrared photodetector structure. We have observed a broad photocurrent signal in a photon energy range of 100-400 meV (wavelength range of 3-10 μm) due to bound-to-continuum intersubband absorption of normal incidence radiation in the valence band of InAs self-assembled quantum dots, showing a peak sensitivity around hv= 190 meV. Furthermore, the observed responsivity was as high as 16 A/W at T = 10 K, which is to our knowledge, the highest value ever reported for quantum dot infrared photodetectors.

Original languageEnglish
Pages (from-to)77-80
Number of pages4
JournalInstitute of Physics Conference Series
Publication statusPublished - 2005
Event31st International Symposium of Compound Semiconductors 2004 - Seoul, Korea, Republic of
Duration: 2004 Sep 122004 Dec 16

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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