Monolithically integrated dual-band quantum well infrared photodetector

D. K. Sengupta, S. D. Gunapala, S. V. Bandara, F. Pool, J. K. Liu, M. McKelvey, E. Luong, J. Torezan, J. Mumulo, W. Hong, J. Gill, G. E. Stillman, A. P. Curtis, S. Kim, L. J. Chou, al et al

Research output: Contribution to journalConference articlepeer-review


A monolithic quantum well infrared photodetector (QWIP) structure has been presented that is suitable for dual bands in the two atmospheric transmission windows of 3-5.3μm and 7.5-14μm, respectively. The proposed structure employs dual stacked, strain InGaAs/AlGaAs and lattice-matched GaAs/AlGaAs quantum well infrared photodetector for mid wavelength and long wavelength detection. The response peak of the strain InGaAs/AlGaAs quantum well is at 4.9 μm and the lattice-matched GaAs/AlGaAs is at 10.5μm; their peak sensitivities are in the spectral regions of 3-5.3μm and 7.5-14μm. The peak responsivity when the dual-band QWIP is biased at 5 Volts is approx. 0.065A/W at 4.9μm and approx. 0.006A/W at 10.5μm; at this voltage the dual-band QWIP is more sensitive at the shorter wavelengths due to its larger impedance thus exhibiting wavelength tunability characteristics with bias. Additionally, single colored 4.9 and 10.5μm QWIPs were fabricated from the dual-band QWIP structure to study the bias-dependent behavior and also to understand the effects of growing the strain layer InGaAs/AlGaAs QWIP on top of the lattice-matched GaAs/AlGaAs QWIP. In summary, two stack dual-band QWIPs using GaAs/AlGaAs and strained InGaAs/AlGaAs multiquantum wells have been demonstrated with peak spectral sensitivities in the spectral region of 3-5.3μm and 7.5-14μm. Also, the voltage tunable dual-band detection have been realized for this kind of QWIP structure.

Original languageEnglish
Pages (from-to)205-214
Number of pages10
JournalMaterials Research Society Symposium - Proceedings
Publication statusPublished - 1997
Externally publishedYes
EventProceedings of the 1997 MRS Fall Symposium - Boston, MA, USA
Duration: 1997 Dec 21997 Dec 4

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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