研究目的
To reduce the surface defects of CsPbI3 perovskite nanocrystals (PNCs) by introducing ammonium acetate in their synthesis, thereby enhancing their photoluminescence quantum yield (PLQY) and stability, and improving the efficiency of red light-emitting diodes (LEDs) fabricated with these PNCs.
研究成果
The addition of NH4OAc effectively passivates surface defects of CsPbI3 PNCs, enhancing their PLQY and stability. This leads to improved performance of red LEDs fabricated with these PNCs, achieving an optimal EQE of 10.6% and a maximum brightness of 981 cd/m2. Surface passivation is confirmed as an effective strategy to improve the performance of NCs and corresponding devices.
研究不足
The study focuses on the passivation of CsPbI3 PNCs with NH4OAc and its impact on LED performance. Limitations may include the specificity of the passivation method to CsPbI3 PNCs and the need for further optimization of NH4OAc ratios for maximum efficiency.
1：Experimental Design and Method Selection:
The synthesis of CsPbI3 PNCs was based on a hot-injection method with modifications, including the addition of NH4OAc to passivate surface defects.
2：Sample Selection and Data Sources:
CsPbI3 PNCs were synthesized with different feeding molar ratios of NH4OAc to PbI2 (0,
3：5, 6, and 7). List of Experimental Equipment and Materials:
Materials included CsOAc, Oleic acid (OA), octadecene (ODE), lead iodide (PbI2), Oleylamine (OLA), NH4OAc, and toluene. Equipment included a fluorescence spectrometer, TEM, XRD, FTIR spectrophotometer, UPS, and a Keithley 2612B source meter.
4：Experimental Procedures and Operational Workflow:
The synthesis involved preparing cesium oleate solution, injecting it into a PbI2 solution at 170°C, cooling, centrifuging, and purifying the PNCs. LEDs were fabricated with a structure of ITO/ZnO/PEI/CsPbI3 NCs/TCTA/MoO3/Au.
5：Data Analysis Methods:
PLQYs were measured, PL decay curves were fitted with biexponential functions, and device performance was evaluated based on EQE and brightness.
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Shimadzu UV-2550 spectrophotometer
UV-2550
Shimadzu
Measuring the absorption spectra of the samples
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fluorescence spectrometer
FLS920P
Edinburgh instrument
Measuring the PL spectra, absolute PLQY and PL lifetime of the perovskite samples
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X-ray diffractometer
Bruker D8 Advance
Bruker
Acquiring XRD patterns
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source meter
Keithley 2612B
Keithley
Measuring the current-voltage characteristics of the devices
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transmission electron microscope
JEM-2100F
TEM
Observing the morphology of CsPbI3 NCs
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Fourier transform infrared spectroscopy
IFS-66V/S
FITR spectrophotometer
Performing FTIR measurements
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ultraviolet photoelectron spectroscopy
UPS
Determining the energy levels of CsPbI3 NCs
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spectrometer
Photo Research SpectraScan PR650
Photo Research
Determining the LED brightness
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