Intermixed quantum well photodetectors for long wavelength detection

D. K. Sengupta, A. P. Curtis, J. I. Malin, H. C. Kuo, K. C. Hseih, M. Feng, G. E. Stillman, A. Kar, J. Mazumder, H. C. Liu, W. I. Wang

Research output: Contribution to journalConference article


Intermixing of the well and barrier layers in quantum well infrared photodetectors (QWIPs) can be used to realize a broadened spectral response as well as multiple color detectors. We describe the experimental results of bom rapid thermal annealing (RTA) and laser annealing (LA) QWIPs operating in the 8-12μm regime. The peak spectral response of the annealed detectors was shifted to longer wavelength as compared to the as-grown detectors. In general, a decrease in detector performance after annealing is also observed which may be attributable to a change in the absorption coefficient caused by the out-diffusion of dopants during annealing. Recent advances in growth technology, complimented by innovative structures should offset any degradation in performance. Thus, the post-growth control of the composition profiles by annealing offers opportunities to fine tune various aspects of a QWIP's response.

Original languageEnglish (US)
Pages (from-to)138-142
Number of pages5
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1998
EventInternational Conference on Fiber Optics and Photonics: Selected Papers from Photonics India '96 - Madras, India
Duration: Dec 9 1996Dec 9 1996

ASJC Scopus subject areas

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

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  • Cite this

    Sengupta, D. K., Curtis, A. P., Malin, J. I., Kuo, H. C., Hseih, K. C., Feng, M., Stillman, G. E., Kar, A., Mazumder, J., Liu, H. C., & Wang, W. I. (1998). Intermixed quantum well photodetectors for long wavelength detection. Proceedings of SPIE - The International Society for Optical Engineering, 3211, 138-142.