研究目的
To enhance the performance and stability of PbS-QDs solar cells by suppressing hydroxyl ligand through the use of hydroiodic acid additive.
研究成果
The hydroiodic acid additive strategy effectively suppressed hydroxyl ligands and converted them with iodine ligand passivation, leading to improved performance and stability of PbS-QDs solar cells. The optimized device achieved a power conversion efficiency of 10.78%, demonstrating the potential of this approach for enhancing QD technologies.
研究不足
The study acknowledges the challenge of completely removing hydroxyl groups in QDs-ink process and the need for precise control over the amount of additive HI to prevent degradation of PbS-QDs.
1：Experimental Design and Method Selection:
The study employed a halide ligand additive strategy to optimize QD-ink process, focusing on reducing sub-bandgap states and converting them into iodide-passivated surfaces.
2：Sample Selection and Data Sources:
Oleate-capped PbS CQDs were synthesized under Schlenk-line conditions.
3：List of Experimental Equipment and Materials:
Materials included Zn(CH3COO)2·2H2O, monoethanolamine, ethanedithiol, hydroiodic acid, lead oxide PbO, oleic acid (OA), 1-octadecene (ODE), hexamethyldisilathiane (TMS), octane, acetone, ethanol, isopropyl alcohol, 1,2-ethanedithiol (EDT), acetonitrile, lead iodide (PbI2), dimethylformamide (DMF), butylamine (BTA), 1-ethyl-3-methylimidazolium iodide (EMII), tetramethylammonium hydroxide pentahydrate (TMAH).
4：Experimental Procedures and Operational Workflow:
The process involved the synthesis of PbS CQDs, device fabrication including the preparation of ZnO film by sol-gel method, and the fabrication of PbS-CQD films by solution-phase ligand-exchange process.
5：Data Analysis Methods:
The study utilized Fourier-transform infrared (FT-IR), 1H nuclear magnetic resonance (NMR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and device performance measurements to analyze the effects of the HI additive.
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Zn(CH3COO)2·2H2O
Sinopharm
Used in the preparation of ZnO film by sol-gel method.
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monoethanolamine
Sinopharm
Used in the preparation of ZnO film by sol-gel method.
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Ethanedithiol
Sinopharm
Used in the synthesis process.
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hydroiodic acid
Sinopharm
Used as an additive to suppress hydroxyl ligands.
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lead oxide PbO
Alfa
Used in the synthesis of oleate-capped PbS CQDs.
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oleic acid (OA)
Alfa Aesar
Used as a capping agent for PbS CQDs.
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1-octadecene (ODE)
Aladdin
Used as a solvent in the synthesis of PbS CQDs.
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hexamethyldisilathiane (TMS)
Tci
Used in the synthesis of PbS CQDs.
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octane
Sinopharm
Used as a solvent for PbS CQDs.
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acetone
Sinopharm
Used in the purification process.
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ethanol
Sinopharm
Used in the purification process.
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isopropyl alcohol
Sinopharm
Used in the purification process.
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1,2-ethanedithiol (EDT)
Aladdin
Used as a ligand in the fabrication of PbS-EDT layers.
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acetonitrile
Sinopharm
Used in the fabrication process.
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lead iodide (PbI2)
Aldrich
Used for ligand exchange in the fabrication of PbS-CQD films.
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dimethylformamide (DMF)
Aladdin
Used as a solvent in the ligand exchange process.
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butylamine (BTA)
Aladdin
Used in the re-dispersion of iodide-passivated PbS CQDs.
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1-ethyl-3-methylimidazolium iodide (EMII)
Alfa
Used in the fabrication process.
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tetramethylammonium hydroxide pentahydrate (TMAH)
Aladdin
Used in the fabrication process.
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