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Optical Characterization of the Interband Cascade LWIR Detectors with Type-II InAs/InAsSb Superlattice Absorber.

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This study characterizes a novel gallium-free long-wave infrared detector using type-II superlattices. Researchers identified key optical transitions and defect energy states, crucial for advanced infrared detection applications.

Keywords:
InAs/InAsSbcascade infrared detectorsdefect statesinfrared detectorsphotoluminescencespectral response

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Optoelectronics

Background:

  • Type-II superlattices (T2SLs) are crucial for advanced infrared detectors.
  • Gallium-free (Ga-free) absorbers offer potential advantages in detector performance.
  • Long-wave infrared (LWIR) detection is vital for various applications.

Purpose of the Study:

  • To characterize a Ga-free InAs/InAsSb absorber for LWIR interband cascade detectors.
  • To determine optical transitions and defect energy states within the T2SL heterostructure.
  • To correlate experimental findings with theoretical calculations.

Main Methods:

  • Molecular Beam Epitaxy (MBE) for heterostructure growth.
  • High-resolution X-Ray Diffraction (HRXRD) for crystallographic quality assessment.
  • Photoluminescence (PL) and Spectral Response (SR) for optical characterization.

Main Results:

  • Determined effective energy gap (Eg) of 116 meV at 300 K for the absorber layer.
  • Identified miniband transitions and defect energy states at 85 meV and 112 meV.
  • Observed temperature-dependent acceptor level transitions.

Conclusions:

  • The study successfully characterized the Ga-free InAs/InAsSb T2SL absorber.
  • Optical transitions and defect states were precisely determined, aiding detector design.
  • The findings provide valuable insights for developing high-performance LWIR detectors.