Self-assembled semiconductor quantum dot infrared photodetector operating at room temperature and focal plane array

Ho Chul Lim*, Stanley Tsao, Wei Zhang, Manijen Razeghi

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations


Self-assembled semiconductor quantum dots have attracted much attention because of their novel properties and thus possible practical applications including the lasers, detectors and modulators. Especially the photodetectors which have quantum dots in their active region have been developed and show promising performances such as high operation temperature due to three dimensional confinement of the carriers and normal incidence in contrast to the case of quantum well detectors which require special optical coupling schemes. Here we report our recent results for midwavelength infrared quantum dot infrared photodetector grown by low-pressure metalorganic chemical vapor deposition. The material system we have investigated consists of 25 period self-assembled InAs quantum dot layers on InAlAs barriers, which are lattice-matched to InP substrates, covered with InGaAs quantum well layers and InAlAs barriers. This active region was sandwiched by highly doped InP contact layers. The device operates at 4.1 urn with a peak detectivity of 2.8 × 10 11 cmHz 1/2/W at 120 K and a quantum efficiency of 35 %. The photoresponse can be observed even at room temperature resulting in a peak detectivity of 6 × 10 7 cmHz 1/2/W. A 320×256 focal plane array has been fabricated in this kind of device. Its performance will also be discussed here.

Original languageEnglish (US)
Title of host publicationInfrared Technology and Applications XXXIII
StatePublished - 2007
EventInfrared Technology and Applications XXXIII - Orlando, FL, United States
Duration: Apr 9 2007Apr 13 2007

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherInfrared Technology and Applications XXXIII
Country/TerritoryUnited States
CityOrlando, FL


  • Detector
  • Focal plane array
  • InAs
  • InP
  • Infrared
  • MWIR
  • Quantum dot
  • Quantum efficiency

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Self-assembled semiconductor quantum dot infrared photodetector operating at room temperature and focal plane array'. Together they form a unique fingerprint.

Cite this