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<p>In this work, a quantum-design-level quantum dot (QD)-based photodetector architecture for simultaneous multi-wavelength detection was quantitatively examined. The proposed structure consists of heterosized PbSe QD ensembles embedded in a ZnO host matrix and coupled to ZnS/PbSe/ZnS double-quantum-barrier (DQB) energy-selective contacts. The DQB contacts serve as resonant tunneling filters for energy-selective carrier extraction, and the QD size regulates the optical transition energy. To solve the effective-mass Schrödinger equation and produce constrained energy levels and wavefunctions, a three-dimensional finite-element model was created in COMSOL Multiphysics. The normalized optical absorption response was computed using these findings in MATLAB. For the larger and smaller QD ensembles, the computed spectra display dimensionless normalized peak absorption responses of 0.85 and 0.92, respectively; these values are peak spectral amplitudes rather than integral absorption values or absolute normalized absorption responses. While the interband transitions primarily occur in the near-infrared/short-wave infrared range, the intraband transitions are associated with the mid-wave/extended mid-wave infrared region. The findings support a blue shift in the absorption response as QD size decreases. While thorough dark-current, detectivity, response-time, SNR, and crosstalk evaluation necessitates future transport and noise modeling, ideal upper-bound EQE and responsivity estimations were introduced.</p>

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Design and simulation of a quantum dot-based photodetector with energy-selective contacts for simultaneous multi-wavelength detection

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月3日

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  • Riadh A. Kadhim,
  • Jafaar Mohammed Daif Alkhasraji,
  • Hamid Vahed Kalankesh

摘要

In this work, a quantum-design-level quantum dot (QD)-based photodetector architecture for simultaneous multi-wavelength detection was quantitatively examined. The proposed structure consists of heterosized PbSe QD ensembles embedded in a ZnO host matrix and coupled to ZnS/PbSe/ZnS double-quantum-barrier (DQB) energy-selective contacts. The DQB contacts serve as resonant tunneling filters for energy-selective carrier extraction, and the QD size regulates the optical transition energy. To solve the effective-mass Schrödinger equation and produce constrained energy levels and wavefunctions, a three-dimensional finite-element model was created in COMSOL Multiphysics. The normalized optical absorption response was computed using these findings in MATLAB. For the larger and smaller QD ensembles, the computed spectra display dimensionless normalized peak absorption responses of 0.85 and 0.92, respectively; these values are peak spectral amplitudes rather than integral absorption values or absolute normalized absorption responses. While the interband transitions primarily occur in the near-infrared/short-wave infrared range, the intraband transitions are associated with the mid-wave/extended mid-wave infrared region. The findings support a blue shift in the absorption response as QD size decreases. While thorough dark-current, detectivity, response-time, SNR, and crosstalk evaluation necessitates future transport and noise modeling, ideal upper-bound EQE and responsivity estimations were introduced.