研究目的
To study the phase transition in CsPbBr3 quantum dots (QDs) and the effects of ligand concentration and the Soret effect on the mass flux in QDs nucleation and phase transformation.
研究成果
The study confirms a three-stage power-law scaling for ligand concentration dependent growth and a phase transformation from CsPbBr3 to Cs4PbBr6 QDs. The ligand concentration and the Soret effect are isomorphic for the mass flux in QDs nucleation and phase transformation. The activity of the surface states is essential for the size dependence of the Soret effect.
研究不足
The study focuses on CsPbBr3 QDs and may not be directly applicable to other perovskite materials. The phase transition mechanism may vary under different experimental conditions.
1：Experimental Design and Method Selection:
The study uses an automated intelligent chemistry robotics system for precise control of OA/OLA quantity, reaction time, and temperature. The system includes a PL signal analyzing system for in-situ experimental data collection.
2：Sample Selection and Data Sources:
The synthesis of CsPbBr3 QDs is carried out in the AIR-Chem system, with solid samples (PbBr2, CsBr) and liquid solvents prepared by robotic modules.
3：List of Experimental Equipment and Materials:
The system includes a micro-injecting system, a semiconductor-based cooling system, and an automatic guided vehicle (AGV) for sample preparations.
4：Experimental Procedures and Operational Workflow:
The system activates the reaction with real-time temperature control and PL system, with analysis data feedback to a PC terminal or mobile devices.
5：Data Analysis Methods:
The PL information is mapped into the average particle size from a benchmarked effective mass approximation (EMA).
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