Cesium lead halide (CsPbX3) nanocrystals have emerged as a new family of material that can outperform the existing semiconductor nanocrystals from their superb optical and charge transport properties. However, the lack of the robust method producing quantum dots of controlled size with high ensemble uniformity has been a major roadblock to the exploration and utilization of the properties confined exciton in CsPbX3. We developed a new synthesis method enabling the precise control of the size in quantum-confined regime based on thermodynamic control of the reaction, which are universally applicable to CsPbX3 system with X=Cl, Br and I. Because of the thermodynamic nature of the control, the control and uniformity of the size is very insensitive to the variation of the experimental parameters affecting the growth kinetics. The high level of size control enabled obtaining ensemble PL at room temperature nearly indistinguishable from single-particle PL, demonstrating extremely high size uniformity. The presentation will also discuss the plausible mechanism of the size control.

Precise size control of CsPbX3 perovskite quantum dots via thermodynamically controlled synthesis

255th National Meeting (2018)

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