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Multifunctional high-performance position sensitive detector based on a Sb2Se3-nanorod/CdS core-shell heterojunction.

Zidong Liang, Jihong Liu, Jikui Ma

    Optics Express
    |October 27, 2022
    PubMed
    Summary

    This study introduces a new antimony selenide nanorod/cadmium sulfide core-shell heterostructure for advanced position sensitive detectors (PSDs). The developed device demonstrates exceptional broadband lateral photoelectric performance, ideal for multifunctional applications.

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Optoelectronics

    Background:

    • Antimony selenide (Sb2Se3) possesses unique one-dimensional crystal structures, leading to interesting optical and electrical properties.
    • Lateral photovoltaic effect (LPE) based devices are crucial for position-sensitive detection.

    Purpose of the Study:

    • To construct a Sb2Se3-nanorod/CdS core-shell heterostructure.
    • To investigate the lateral photovoltaic effect, lateral photocurrent, and photoresistance effects in this novel heterostructure.
    • To evaluate its potential as a multifunctional position sensitive detector (PSD).

    Main Methods:

    • Fabrication of Sb2Se3-nanorod/CdS core-shell heterostructures.
    • Characterization of lateral photoelectric performance across a broad spectral range (405-1064 nm).
    • Analysis of position sensitivity, nonlinearity, frequency response, stability, repeatability, and working distance.

    Main Results:

    • The heterojunction demonstrated excellent lateral photoelectric performance with high position sensitivities (PSs) for photovoltage, photocurrent, and photoresistance.
    • Nonlinearity was maintained below 7%, indicating high accuracy.
    • The device exhibited good stability, repeatability, and fast response times (48 µs rise, 180 µs fall).
    • Significant linear working distances were achieved, with notable PS even at 9 mm.

    Conclusions:

    • The Sb2Se3-nanorod/CdS core-shell heterostructure shows great potential for developing novel, high-performance, multifunctional PSDs.
    • The observed performance is attributed to high-quality Sb2Se3 nanorod arrays and efficient charge-carrier dynamics.
    • This work offers valuable insights for designing broadband, ultrafast PSDs with large working distances.