研究目的
Investigating the nucleation and growth processes of methylammonium lead iodide perovskite (MAPbI3) nanocrystals (NCs) to understand their formation mechanism and surface ligation stage.
研究成果
The formation of hybrid perovskite NCs includes a surface ligation stage that increases NC stability and photoluminescence. The study demonstrates that sub-populations of NCs can be selected based on their surface properties through choice of filter material, enabling spectroscopic investigation of nucleation and growth during a perovskite NC synthesis.
研究不足
The study is limited by the potential for NCs to continue to grow or dissolve back into precursors during centrifugation, and the susceptibility of perovskite NCs to damage during TEM measurements due to their soft lattice.
1：Experimental Design and Method Selection:
The study employed a rapid sampling technique using syringe filters to quench NC growth, allowing for the measurement of absorbance and fluorescence spectra during synthesis.
2：Sample Selection and Data Sources:
MAPbI3 NCs were synthesized via a solvation-mediated synthesis, with aliquots extracted at 16 discrete time points during five separate syntheses.
3：List of Experimental Equipment and Materials:
Syringe filters (PTFE and nylon), 1 mm path length cuvette, homebuilt instrument for fluorescence measurements, FEI Titan 80-300 kV STEM for TEM imaging.
4：Experimental Procedures and Operational Workflow:
Aliquots were filtered through either PTFE or nylon membrane syringe filters into a cuvette for spectroscopic measurement. TEM images were obtained for NCs grown for 120 minutes.
5：Data Analysis Methods:
Spectra measured for aliquots extracted at the same time points during the five separate syntheses were averaged. The stability of nascent NCs at different stages of growth was analyzed by measuring absorbance and fluorescence spectra at a series of time points after filtration.
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