研究目的
To address the toxicity and instability problems of lead-based perovskites by synthesizing lead-free Sn/Ge-based perovskite quantum dots at room temperature.
研究成果
The LARP technique was successfully applied to synthesize Cs(Sn,Ge)X3 quantum dots at room temperature, offering a convenient method for band gap tuning. However, further work is needed to stabilize Sn/Ge based perovskite into black phase and improve the synthesis method.
研究不足
The study faced challenges with the purification process leading to inability to acquire accurate particle size by TEM. The stability of Sn-based perovskite nanoparticles was poor even under the protection of long-chain ligand.
1：Experimental Design and Method Selection:
The study employed the ligand-assisted re-precipitation (LARP) method for the synthesis of Cs(Sn,Ge)X3 quantum dots at room temperature.
2：Sample Selection and Data Sources:
Precursors of SnX2 (X=Br, I) and CsX dissolved in N, N-dimethylformamide (DMF) were used.
3：List of Experimental Equipment and Materials:
Instruments included a Horiba’s PL measurement system, Pan-Analytical X-Pert PRO X-ray diffraction system, and Transmission electron microscope (TEM). Materials included DMF, toluene, and trioctylphosphine (TOP).
4：Experimental Procedures and Operational Workflow:
Precursor solutions were transferred into toluene with vigorous stirring, followed by the addition of TOP to stop the growth.
5：Data Analysis Methods:
Photoluminescence characteristics were measured, and crystallographic characterization was performed using XRD and TEM.
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