Quantum Well Infrared Photodetectors (QWIPs)


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We are developing infrared photodetectors based on intraband transitions in III-V semiconductors for different applications such as toxic gas detection, industrial monitoring, milk protein and lactose detection, thermal imaging, among others. In particular, we are interested in intraband transitions in periodic structures, which contain a defect, giving rise to localized states in the continuum. With this approach the detection wavelength is not limited by the bandoffset between the quantum well and barrier materials.

Fig. 1 Photocurrent for a QWIP used for the detection of CO2.

Fig. 2 Equipment developed to detect CO2.

Fig. 3 On the right hand side, absorption calculation for a S-QWIP (QWIP with a superlattice). On the left the band structure and probability densities for a few energy levels.

Fig. 4 Photocurrent detection at energies beyond the materials bandoffset.

The results obtained can be found in the following references:

  • Detecting Infrared Radiation beyond the Bandoffset with Intersubband Transitions

    GUERRA, LESSLIE; PENELLO, GERMANO; PIRES, MAURICIO; PINTO, LUCIANA; JAKOMIN, ROBERTO; MOURAO, RENATO; DEGANI, MARCOS; MAIALLE, MARCELO; SOUZA, PATRICIA
    IEEE Photonics Technology Letters. , v.28, p.1 - 1, 2016.

  • Photocurrent Calculation of Intersubband Transitions to Continuum-Localized States in GaAs/AlGaAs Multiquantum Wells for Mid-Infrared Photodetector

    PENELLO, GERMANO M. ; Degani, Marcos H. ; Maialle, Marcelo Z. ; Pires, Mauricio P. ; Souza, Patricia L.
    IEEE Journal of Quantum Electronics , v. 49, p. 747-752, 2013.

  • InGaAs/InAlAs quantum well infrared photodetectors for operation in the 1.7 to 3.1 microns

    L. Guerra ; Penello, G. M. ; PINTO, L. D. ; JAKOMIN, R. ; MOURAO, R. ; PIRES, M. P. ; Degani, Marcos H. ; Maialle, Marcelo Z. ; SOUZA, P. L.
    In: SBMicro meeting Chip in Aracaju, 2014, Aracaju. Microelectronics Technology and Devices, 2014. v.

  • Detecting milk components using intraband infrared photodetectors

    D. M. Szwarcman, M. P. Pires and P. L. Souza,
    In: SBMicro meeting Chip in the Mountains in Belo Horizonte, 2016. Microelectronics technology and Devices, 2016.
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