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Acta Optica Sinica, Volume. 45, Issue 4, 0416002(2025)

PbS Quantum Dots Passivated by High Concentration of PbBr2 and Their Photovoltaic Properties

Shasha Chang1, Rui Qin2, Qing Li1, Tao Ma1, Menglin Li1, Shuai Wen1, Yuxuan Du1, Lier Deng1, and Huan Liu1、*
Author Affiliations
  • 1Shaanxi Province Key Laboratory of Thin Films Technology and Optical Test, School of Opto-Electronical Engineering, Xi’an Technological University, Xi’an 710021, Shaanxi , China
  • 2State Key Laboratory for Manufacturing System Engineering, School of Instrument Science and Technology, Xi’an Jiaotong University, Xi’an 710049, Shaanxi , China
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    Properties of PbS quantum dots. (a) Absorption peak; (b) TEM topography; (c) histogram of particle size distribution; (d) X-ray diffraction pattern

    Fig. 1. Properties of PbS quantum dots. (a) Absorption peak; (b) TEM topography; (c) histogram of particle size distribution; (d) X-ray diffraction pattern

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    Characterisation of film properties before and after PbS quantum dot ligand exchange. (a) Fourier infrared spectra; (b) absorption spectra

    Fig. 2. Characterisation of film properties before and after PbS quantum dot ligand exchange. (a) Fourier infrared spectra; (b) absorption spectra

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    Changes in surface morphology and roughness of films after exchange of different concentrations of PbBr2 ligands. (a) 0.01 mol/L PbBr2; (b) 0.02 mol/L PbBr2; (c) 0.03 mol/L PbBr2; (d) 0.04 mol/L PbBr2; (e) 0.05 mol/L PbBr2; (f) 0.06 mol/L PbBr2; (g) change trend of roughness

    Fig. 3. Changes in surface morphology and roughness of films after exchange of different concentrations of PbBr2 ligands. (a) 0.01 mol/L PbBr2; (b) 0.02 mol/L PbBr2; (c) 0.03 mol/L PbBr2; (d) 0.04 mol/L PbBr2; (e) 0.05 mol/L PbBr2; (f) 0.06 mol/L PbBr2; (g) change trend of roughness

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    X-ray photoelectron spectra of major elements (Pb 4f, I 3d, C 1s, O 1s, Br 3d, S 2p orbitals) of 0.01 mol/L PbBr2, 0.04 mol/L PbBr2, and 0.06 mol/L PbBr2 thin films and atomic fraction distribution. (a) Pb 4f peak; (b) I 3d peak; (c) C 1s peak; (d) O 1s peak; (e) Br 3d peak; (f) S 2p peak; (g) atomic fraction

    Fig. 4. X-ray photoelectron spectra of major elements (Pb 4f, I 3d, C 1s, O 1s, Br 3d, S 2p orbitals) of 0.01 mol/L PbBr2, 0.04 mol/L PbBr2, and 0.06 mol/L PbBr2 thin films and atomic fraction distribution. (a) Pb 4f peak; (b) I 3d peak; (c) C 1s peak; (d) O 1s peak; (e) Br 3d peak; (f) S 2p peak; (g) atomic fraction

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    Schematic of PbS quantum dot photodetector structure and performance test results. (a) Schematic of PbS quantum dot photodetector structure; (b) I-V curves under different dark conditions; (c) dark current at -0.5 V under dark conditions for different devices; (d) I-V curves under light and dark conditions for 0.04 mol/L PbBr2 device; (e) external quantum efficiency curves for different devices; (f) response curves for different devices; (g) specific detectivity curves for different devices; (h) photoelectric response time for 0.04 mol/L PbBr2 device

    Fig. 5. Schematic of PbS quantum dot photodetector structure and performance test results. (a) Schematic of PbS quantum dot photodetector structure; (b) I-V curves under different dark conditions; (c) dark current at -0.5 V under dark conditions for different devices; (d) I-V curves under light and dark conditions for 0.04 mol/L PbBr2 device; (e) external quantum efficiency curves for different devices; (f) response curves for different devices; (g) specific detectivity curves for different devices; (h) photoelectric response time for 0.04 mol/L PbBr2 device

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    Stability test results of PbS quantum dot photodetector

    Fig. 6. Stability test results of PbS quantum dot photodetector

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    • Table 1. External quantum efficiency, responsivity, and specific detectivity at the dark current and exciton peak of the device at different PbBr2 concentrations

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      Table 1. External quantum efficiency, responsivity, and specific detectivity at the dark current and exciton peak of the device at different PbBr2 concentrations

      DeviceDark current /AEQE /%R /（mA/W）D* /Jones
      0.01 mol/L PbBr25.2×10-65.0162.9851.89×1010
      0.02 mol/L PbBr24.6×10-610.77135.5244.33×1010
      0.03 mol/L PbBr21.7×10-621.38268.9231.41×1011
      0.04 mol/L PbBr21.2×10-625.77324.2592.03×1011
      0.05 mol/L PbBr21.5×10-613.49169.6619.48×1010
      0.06 mol/L PbBr22.2×10-611.62146.1356.75×1010
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    Shasha Chang, Rui Qin, Qing Li, Tao Ma, Menglin Li, Shuai Wen, Yuxuan Du, Lier Deng, Huan Liu. PbS Quantum Dots Passivated by High Concentration of PbBr2 and Their Photovoltaic Properties[J]. Acta Optica Sinica, 2025, 45(4): 0416002

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    Paper Information

    Category: Materials

    Received: Nov. 5, 2024

    Accepted: Dec. 10, 2024

    Published Online: Feb. 21, 2025

    The Author Email: Liu Huan (liuhuan360@163.com)

    DOI:10.3788/AOS241708

    CSTR:32393.14.AOS241708

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology