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Related Experiment Video

Updated: Mar 7, 2026

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Electrical and optical performance evaluation in solution-process-based optoelectronic devices: theoretical modeling.

Mohammad Rashidi, Ali Rostami, Mahboubeh Dolatyari

    Applied Optics
    |March 2, 2017
    PubMed
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    This study models quantum dot infrared photodetectors, revealing geometrical factors significantly impact performance. Nonuniform quantum dot sizes, for instance, reduce device detectivity and tunneling current.

    Area of Science:

    • Optoelectronics
    • Quantum Dot Technology
    • Semiconductor Physics

    Background:

    • Solution-processed optoelectronic devices, like quantum dot (QD) infrared photodetectors, are crucial for advanced sensing applications.
    • Accurate theoretical evaluation of these devices is essential for optimizing their performance.
    • Understanding current transport mechanisms and geometrical influences is key to device design.

    Purpose of the Study:

    • To develop a computational and semi-analytical model for theoretical evaluation of solution-process-based optoelectronic devices.
    • To extract dark current and photocurrent for infrared photodetectors using the proposed model.
    • To analyze the impact of geometrical parameters on device performance.

    Main Methods:

    • Utilized the Landauer-Büttiker formalism with Green's function method for electron tunneling in confined states.

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  • Applied the drift-diffusion model, incorporating quantum dot trapping/detrapping, for electron drift in continuum states.
  • Investigated geometrical effects: QD size distribution, inter-QD spacing, system length, and width.

    • Main Results:

    • The model successfully extracts dark current and photocurrent for infrared photodetectors.
    • Geometrical factors, including QD size distribution and spacing, significantly influence device parameters like absorption coefficient, photoconductive gain, dark current, and detectivity.
    • Nonuniform QD sizes negatively affect device detectivity and can decrease tunneling current.

    Conclusions:

    • The developed model provides a robust framework for evaluating solution-process-based optoelectronic devices.
    • Device performance is highly dependent on geometrical aspects, particularly quantum dot size uniformity.
    • Optimization of geometrical parameters is critical for enhancing the detectivity and overall performance of quantum dot infrared photodetectors.