Cesium Lead Iodide Perovskites Drexel University, Chemical and Biological Engineering Huilin Kuang, Dr. Aaron Fafarman References Introduction Methods Data/Results Conclusion Future Work • Optimize electron transport in the film by increasing the size of crystal grains and their connectivity • Quantify the known metastability of the desired black, perovskite phase • Annealing at 350˚C the material changes from nonfunctional, yellow phase and crystallizes into a black, polycrystalline, conductive phase • Cesium lead iodide black phase contains conductive grains, but exposure to environment and high temperatures makes it susceptible to phase change into yellow phase • Changing solvent made no significant impact on grain size • Cesium lead iodide is best spin coated at 1000 RPM unheated • Cesium lead iodide changes phases at 150˚C S. Dastidar et al., "High chloride Doping levels stabilize the Perovskite phase of Cesium lead iodide,” Nano Letters, vol. 16, no. 6, pp. 3563–3570, May 2016. 0 0.5 1 1.5 2 2.5 300 400 500 600 700 800 Absorbance Wavelength (nm) Phase Change From Increasing Temperature RT 50C 100C 150C Heated 150˚C , 4000 RPM Heated 150˚C , 1000 RPM DMF/DMSO Heated 150˚C , 1000 RPM DMF/DMSO Unheated , 1000 RPM -0.1 0 0.1 0.2 0.3 0.4 0.5 500 550 600 650 700 750 800 Absorbance Wavelength (nm) CsPbI3 Different Spin Speed and Temperature Zoom 1000 RT 1000 150C 2500 RT 2500 150C 4000 RT 4000 150C Future work includes incorporating cesium lead chloride into the films. Chloride stabilizes the iodide and allows for better conductivity. The method of incorporation would be by synthesizing both CsPb I " and CsPb Cl " nanocrystals and fusing them together.

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Cesium Lead Iodide PerovskitesDrexel University, Chemical and Biological Engineering

Huilin Kuang, Dr. Aaron Fafarman

References

Introduction

Methods

Data/Results

Conclusion

Future Work

• Optimize electron transport in the film byincreasing the size of crystal grains andtheir connectivity

• Quantify the known metastability of thedesired black, perovskite phase

• Annealing at 350˚C the material changesfrom nonfunctional, yellow phase andcrystallizes into a black, polycrystalline,conductive phase

• Cesium lead iodide black phase containsconductive grains, but exposure toenvironment and high temperatures makesit susceptible to phase change into yellowphase

• Changing solvent made no significant impact on grain size

• Cesium lead iodide is best spin coated at 1000 RPM unheated

• Cesium lead iodide changes phases at 150˚C

S. Dastidar et al., "High chloride Dopinglevels stabilize the Perovskite phase ofCesium lead iodide,” Nano Letters, vol.16, no. 6, pp. 3563–3570, May 2016.

0.5

1.5

2.5

300 400 500 600 700 800Ab

sorban

Wavelength(nm)

PhaseChangeFromIncreasingTemperature

RT50C100C150C

Heated 150˚C , 4000 RPM Heated 150˚C , 1000 RPM

DMF/DMSOHeated 150˚C , 1000 RPM

DMF/DMSOUnheated , 1000 RPM

-0.1

0.1

0.2

0.3

0.4

0.5

500 550 600 650 700 750 800

Absorban

Wavelength(nm)

CsPbI3DifferentSpinSpeedandTemperatureZoom

1000RT 1000150C 2500RT2500150C 4000RT 4000150C

Future work includes incorporating cesiumlead chloride into the films. Chloridestabilizes the iodide and allows for betterconductivity. The method of incorporationwould be by synthesizing both CsPb I"and CsPb Cl" nanocrystals and fusingthem together.