Photoconductive spectral analysis of InAs quantum dot under normal incidence

S. E. Schacham, G. Bahir, E. Finkman, F. H. Julien, F. Fossard, J. Brault, M. Gendry

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


InAs/InAlAs-on-InP quantum dots were implemented for infrared photodetection. The photoconductive spectra were measured as a function of polarization angle and bias. Normal incidence configuration was employed, to emphasize the contrast to the response in quantum well infrared photodetectors (QWIPs). Several peaks were observed, ranging from 90 to 420 meV. The strongest peak, at around 95 meV, is highly polarized. The superlinear increase of the intensity with bias, due to bound-to-bound transition followed by tunneling, was modeled successfully by WKB approximation. I-V characteristics show no improvement over QWIP performance.

Original languageEnglish
Pages (from-to)509-512
Number of pages4
JournalInfrared Physics and Technology
Issue number5-6
StatePublished - 2003


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