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High-performance graphene–PbS quantum dots hybrid photodetector with broadband response and long-time stability

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Abstract

In this work, a graphene photodetector hybrid with lead sulfide quantum dots (PbS QDs) is introduced, aiming to take both the advantages of broad-spectrum absorption of PbS QDs and ultrafast carrier mobility of graphene. Through coating the PbS QDs on the graphene, a hybrid photodetector was successfully fabricated, and the optical response of this device to the photo illumination was observed from 405 to 980 nm. The experimental results show that the photoresponsivity of the hybrid photodetector is 7.7 × 102 A·W−1, 6.4 × 102 A·W−1, 5.4 × 102 A·W−1 and 2 × 102 A·W−1 under 0.16 mW/cm2 laser illumination of 405 nm, 515 nm, 650 nm and 980 nm, respectively. The maximum photoresponsivity of this device is 7.7 × 102 A·W−1 (8.93 × 109 Jones). The photoconductive gain is 3 × 107. Moreover, the device can maintain steady photoresponse for more than 250 s and 25 on/off switching cycles at least. It is believed that such a device fabricated by controllable graphene film and PbS QDs with long-time photoresponse stability in broadband spectrum will stimulate the development of novel graphene photodetectors.

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Data Availability

The data that support the findings of this study are available on request from the corresponding author, upon reasonable request.

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Authors and Affiliations

  1. College of Electronic and Optical Engineering, Nanjing University of Posts and Telecommunications, Nanjing, 2100231, China

    Jiajin Zheng, Wanchao Di, Beibei Bao, Jiaqi Lu, Kehan Yu & Wei Wei

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  1. Jiajin Zheng
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  2. Wanchao Di
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  3. Beibei Bao
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  4. Jiaqi Lu
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  5. Kehan Yu
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  6. Wei Wei
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Contributions

Jiajin Zheng wrote the main manuscript text； Wanchao Di, BeiBei Bao,and Jiaqi Lu performed the experiment； kehan Yu and Wei Wei contributed significantly to analysis and manuscript preparation;

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Correspondence to Jiajin Zheng.

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Zheng, J., Di, W., Bao, B. et al. High-performance graphene–PbS quantum dots hybrid photodetector with broadband response and long-time stability. Appl. Phys. B 129, 43 (2023). https://doi.org/10.1007/s00340-023-07988-y

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